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Development of a new irradiation-embrittlement prediction model for reactor pressure-vessel steels
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作者 Chu Lu Sun +1 位作者 Zhen-Feng Tong Qing Wang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第11期182-192,共11页
Predicting the transition-temperature shift(TTS)induced by neutron irradiation in reactor pressure-vessel(RPV)steels is important for the evaluation and extension of nuclear power-plant lifetimes.Current prediction mo... Predicting the transition-temperature shift(TTS)induced by neutron irradiation in reactor pressure-vessel(RPV)steels is important for the evaluation and extension of nuclear power-plant lifetimes.Current prediction models may fail to properly describe the embrittlement trend curves of Chinese domestic RPV steels with relatively low Cu content.Based on the screened surveillance data of Chinese domestic and similar international RPV steels,we have developed a new fluencedependent model for predicting the irradiation-embrittlement trend.The fast neutron fluence(E>1 MeV)exhibited the highest correlation coefficient with the measured TTS data;thus,it is a crucial parameter in the prediction model.The chemical composition has little relevance to the TTS residual calculated by the fluence-dependent model.The results show that the newly developed model with a simple power-law functional form of the neutron fluence is suitable for predicting the irradiation-embrittlement trend of Chinese domestic RPVs,regardless of the effect of the chemical composition. 展开更多
关键词 Reactor pressure vessel steel Transition temperature shift Irradiation embrittlement embrittlement trend curve Prediction model
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Review on the design of high-strength and hydrogen-embrittlement-resistant steels
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作者 Zhiyu Du Rongjian Shi +2 位作者 Xingyu Peng Kewei Gao Xiaolu Pang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第7期1572-1589,共18页
Given the carbon peak and carbon neutrality era,there is an urgent need to develop high-strength steel with remarkable hydrogen embrittlement resistance.This is crucial in enhancing toughness and ensuring the utilizat... Given the carbon peak and carbon neutrality era,there is an urgent need to develop high-strength steel with remarkable hydrogen embrittlement resistance.This is crucial in enhancing toughness and ensuring the utilization of hydrogen in emerging iron and steel materials.Simultaneously,the pursuit of enhanced metallic materials presents a cross-disciplinary scientific and engineering challenge.Developing high-strength,toughened steel with both enhanced strength and hydrogen embrittlement(HE)resistance holds significant theoretical and practical implications.This ensures secure hydrogen utilization and further carbon neutrality objectives within the iron and steel sector.Based on the design principles of high-strength steel HE resistance,this review provides a comprehensive overview of research on designing surface HE resistance and employing nanosized precipitates as intragranular hydrogen traps.It also proposes feasible recommendations and prospects for designing high-strength steel with enhanced HE resistance. 展开更多
关键词 hydrogen embrittlement surface design hydrogen traps nanosized precipitates
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Atomistic study on the microscopic mechanism of grain boundary embrittlement induced by small dense helium bubbles in iron
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作者 Lei Peng Yong-Jie Sun +3 位作者 Jing-Yi Shi Yi-Fei Liu Shang-Ming Chen Liu-Liu Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第3期84-95,共12页
The helium bubbles induced by 14 MeV neutron irradiation can cause intergranular fractures in reduced activation ferritic martensitic steel,which is a candidate structural material for fusion reactors.In order to eluc... The helium bubbles induced by 14 MeV neutron irradiation can cause intergranular fractures in reduced activation ferritic martensitic steel,which is a candidate structural material for fusion reactors.In order to elucidate the susceptibility of different grain boundaries(GBs)to helium-induced embrittlement,the tensile fracture processes of 10 types of GBs with and without helium bubbles in body-centered cubic(bcc)iron at the relevant service temperature of 600 K were investigated via molecular dynamics methods.The results indicate that in the absence of helium bubbles,the GBs studied here can be classified into two distinct categories:brittle GBs and ductile GBs.The atomic scale analysis shows that the plastic deformation of ductile GB at high temperatures originates from complex plastic deformation mechanisms,including the Bain/Burgers path phase transition and deformation twinning,in which the Bain path phase transition is the most dominant plastic deformation mechanism.However,the presence of helium bubbles severely inhibits the plastic deformation channels of the GBs,resulting in a significant decrease in elongation at fractures.For bubble-decorated GBs,the ultimate tensile strength increases with the increase in the misorientation angle.Interestingly,the coherent twin boundary∑3{112}was found to maintain relatively high fracture strength and maximum failure strain under the influence of helium bubbles. 展开更多
关键词 Helium bubble Grain boundary embrittlement Reduced activation ferritic martensitic steel Molecular dynamics Bain path
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Hydrogen Embrittlement of Nitrogenating Layer on Martensitic Alloys
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作者 Daniel Moreno Yohanan Nachmana +5 位作者 Shimon Bashan Barak Weizman Denis Panchenko Michael Mansano Elinor Itzhak Moshe Shapira 《Journal of Minerals and Materials Characterization and Engineering》 2023年第5期161-171,共11页
Nitriding of the surface in martensitic stainless steels is commonly carried out to improve their wear resistance. The process of plasma nitriding in stainless steel is influenced by two mechanisms: physical diffusion... Nitriding of the surface in martensitic stainless steels is commonly carried out to improve their wear resistance. The process of plasma nitriding in stainless steel is influenced by two mechanisms: physical diffusion through the surface and chemical gas-metal reaction. The inner nitriding interaction involves the simultaneous penetration and formation of a solid solution, as well as the interaction of nitrogen with specific alloying elements, resulting in the development of homogeneous and heterogeneous structures. Our study concludes that the observed intergranular hydrogen embrittlement and crack formation during the surface nitridation process of AMS 5719 martensite alloy steel can be attributed to the ammonium concentration of approximately 50% at a temperature of 530˚C. 展开更多
关键词 Hydrogen embrittlement Nitriding Coat Cracks Martensite Steel Surface Hardness
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Environmental Embrittlement of Fe-based, Co-based, Ni-based and Ti-based Intermetallics in Gaseous Hydrogen
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作者 姚美意 万晓景 +1 位作者 陈业新 倪建森 《Advances in Manufacturing》 SCIE CAS 2000年第S1期169-172,共4页
The environmental embrittlement of intermetallics Co3Ti, Ni3Al, Fe3Al and TiAl has been investigated by measuring the tensile properties in oxygen and hydrogen at 2×l0-4/s strain rate. The results show that the ... The environmental embrittlement of intermetallics Co3Ti, Ni3Al, Fe3Al and TiAl has been investigated by measuring the tensile properties in oxygen and hydrogen at 2×l0-4/s strain rate. The results show that the hydrogen embrittlement factor in gaseous hydrogen (IH2 ) defined as[(δO2 -δH2 ) / δH2, ] ×l00% of above mentioned four intermetallics is decreased in the sequence of Co3Ti> Ni3Al> Fe3Al> TiAl. This phenomena can be explained by the different catalytic reaction on the surface of matrix metals (such as Ni, Co, Fe, Ti) with decomposition of H2 into atommic hydrogen, leading to hydrogen embrittlement. 展开更多
关键词 intermetallics compounds hydrogen embrittlement catalytic reaction
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Critical Time and Temper Embrittlement Isotherms 被引量:15
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作者 Xu Tingdong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 1999年第1期27-35,共9页
Temperembritlementinlow-aloysteelsisgeneralydefinedasembritlementwhichappearsafterheatingorslowcoolinginthec... Temperembritlementinlow-aloysteelsisgeneralydefinedasembritlementwhichappearsafterheatingorslowcoolinginthecriticaltempera-tu... 展开更多
关键词 CRITICAL TIME SEGREGATION isotherms embrittlement
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Effects of Si on the stability of retained austenite and temper embrittlement of ultrahigh strength steels 被引量:9
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作者 Li-jun Wang Qing-wu Cai Hui-bin Wu Wei Yu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第5期543-550,共8页
Effects of silicon (Si) content on the stability of retained austenite and temper embrittlement of ultrahigh strength steels were investigated using X-ray diffraction (XRD),transmission electron microscopy (TEM)... Effects of silicon (Si) content on the stability of retained austenite and temper embrittlement of ultrahigh strength steels were investigated using X-ray diffraction (XRD),transmission electron microscopy (TEM),and other experimental methods.The results show that Si can suppress temper embrittlement,improve temper resistance,and hinder the decomposition of retained austenite.Reversed austenite appears gradually with the increase of Si content during tempering.Si has a significant effect on enhancing carbon (C) partitioning and improving the stability of retained austenite.Si and C atoms are mutually exclusive in lath bainite,while they attract each other in austenite.ε-carbides are found in 1.8wt% Si steel tempered at 250℃,and they get coarsened obviously when tempered at 400℃,leading to temper embrittlement.Not ε-carbides but acicular or lath carbides lead to temper embrittlement in 0.4wt% Si steel,which can be inferred as cementites and composite compounds.Temper embrittlement is closely related to the decomposition of retained austenite and the formation of reversed austenite. 展开更多
关键词 SILICON ultrahigh strength steel retained austenite temper embrittlement reversed austenite
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Hydrogen embrittlement of X80 pipeline steel in H2S environment: Effect of hydrogen charging time, hydrogen-trapped state and hydrogen charging–releasing–recharging cycles 被引量:9
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作者 Peng-peng Bai Jie Zhou +3 位作者 Bing-wei Luo Shu-qi Zheng Peng-yan Wang Yu Tian 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2020年第1期63-73,共11页
This study investigated the susceptibility of X80 pipeline steel to hydrogen embrittlement given different hydrogen pre-charging times and hydrogen charging–releasing–recharging cycles in H2S environment.The fractur... This study investigated the susceptibility of X80 pipeline steel to hydrogen embrittlement given different hydrogen pre-charging times and hydrogen charging–releasing–recharging cycles in H2S environment.The fracture strain of the steel samples decreased with increasing hydrogen pre-charging time;this steel degradation could almost be recovered after diffusible hydrogen was removed when the hydrogen pre-charging time was<8 d.However,unrecoverable degeneration occurred when the hydrogen pre-charging time extended to 16–30 d.Moreover,nanovoid formation meant that the hydrogen damage to the steel under intermittent hydrogen pre-charging–releasing–recharging conditions was more serious than that under continuous hydrogen pre-charging conditions.This study illustrated that the mechanical degradation of steel is inevitable in an H2S environment even if diffusible hydrogen is removed or visible hydrogen-induced cracking is neglected.Furthermore,the steel samples showed premature fractures and exhibited a hydrogen fatigue effect because the repeated entry and release of diffusible hydrogen promoted the formation of vacancies that aggregated into nanovoids.Our results provide valuable information on the mechanical degradation of steel in an H2S environment,regarding the change rules of steel mechanical properties under different hydrogen pre-charging times and hydrogen charging–releasing–recharging cycles. 展开更多
关键词 high-strength steel hydrogen embrittlement corrosion hydrogen diffusion
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EFFECT OF ALLOYING ELEMENTS ON SENSITIVITY TO ENVIRONMENTAL EMBRITTLEMENT OF L1_2 INTERMETALLICS 被引量:9
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作者 X.J.Wan, X.Y.Cheng and Y.X.Chen Materials Research Institute, Shanghai University, Shanghai 200072, China 《中国有色金属学会会刊:英文版》 CSCD 1999年第S1期117-124,共8页
The effect of Zr doping in Ni 3Al and B doping in Co 3Ti intermetallics on the sensitivity to moisture induced environmental embrittlement and on the hydrogen diffusivity was investigated. The results show that both B... The effect of Zr doping in Ni 3Al and B doping in Co 3Ti intermetallics on the sensitivity to moisture induced environmental embrittlement and on the hydrogen diffusivity was investigated. The results show that both B in Co 3Ti and Zr in Ni 3Al do not reduce the hydrogen diffusivity along the grain boundaries, therefore can not suppress the moisture induced environmental embrittlement. The above mentioned behavior of Zr in Ni 3Al and B in Co 3Ti is attributed to the fact that Zr and B are not segregated on the grain boundaries. 展开更多
关键词 L1 2 INTERMETALLICS environmental embrittlement hydrogen DIFFUSIVITY grain boundary SEGREGATION
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EFFECT OF CHROMIUM AND BORON ON ENVIRONMENTAL EMBRITTLEMENT OF FORGED Fe_3Al 被引量:5
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作者 J.Q. Su S.J Gao and Z.Q. Hu (Liaoning Key Laboratory for Materials and Hydrogen, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)(National Key Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences, 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1997年第3期188-191,共4页
The effects of addition of chromium or boron on room temperature tensile properties,fracture behavior and susceptibility to test environments (air vs. vacuuwi of forged Fe3Al have been investigated. The results indica... The effects of addition of chromium or boron on room temperature tensile properties,fracture behavior and susceptibility to test environments (air vs. vacuuwi of forged Fe3Al have been investigated. The results indicated that both chromium and boron result in increasing room temperuture ductility and fracture strength of the Fe3Al alloy whether tested in air or in vacuum. The susceptibility to test envimnment was described with the embrittlement index I: I=(δv-δA)/δv. The embrittlement indexes, for Fe-30Al, Fe-30Al-4Cr and Fe-30Al-0. 13B (at. %), are 24%, 37% and 29%,respectively. Scanning electron microscope examination of fracture surface revealed that the fracture mode of the three alloys remains unchanged, and all of them exhibited a transgranular cleavage fracture mode when tested in vacuum or air. 展开更多
关键词 CHROMIUM BORON Fe_3Al enviromental embrittlement
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First-principles Study on the Ductility Effect of Zirconium and Its Distinct Behavior from Boron to Restrain Hydrogen-induced Embrittlement in Ni-Ni3Al Alloys 被引量:4
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作者 Yuxi WU Yuanming WANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第2期165-171,共7页
By studying a cluster model containing Ni region (phase), NiaAI region (phase) and Ni/Ni3Al region (interface) with a first-principles method, the occupation behavior and the ductility effect of zirconium in a N... By studying a cluster model containing Ni region (phase), NiaAI region (phase) and Ni/Ni3Al region (interface) with a first-principles method, the occupation behavior and the ductility effect of zirconium in a Ni-Ni3Al system were investigated. It is found that zirconium has a stronger segregation tendency to Ni region than to Ni3Al region. The bond order analyses based on Rice-Wang model and the maximum theoretical shear stress model, however, show that zirconium has different degrees of ductility effect in these three regions, which originates from its different ability to increase the Griffith work of interracial cleavage 2γint and to decrease the maximum theoretical shear stress τmax. In addition, it is revealed in this paper that the distinct behavior of zirconium from boron to restrain hydrogen-induced embrittlement can be attributed to their different influences on the crystalline and electronic structures in Ni-Ni3Al alloys. 展开更多
关键词 Interface Occupation behavior embrittlement DUCTILITY
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ELECTRONIC STATES AND HYDROGEN EMBRITTLEMENTIN TRANSITION METALS 被引量:6
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作者 S. Tanimori and S. Shimamura(Department of Applied Science, Faculty of Engineering, Yamaguchi University, Ube 755, Japan) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1997年第3期271-275,共5页
An electronic approach to the mechanism of hydrogen embrittlement in metals is pre-sented and discussed. Some problems of the mechanism of hydrogen embrittlement are pointed out from an electronic point of view. Elect... An electronic approach to the mechanism of hydrogen embrittlement in metals is pre-sented and discussed. Some problems of the mechanism of hydrogen embrittlement are pointed out from an electronic point of view. Electronic structure calculations in a periodically cleaved or slipped lattice are developed in orker to identofy deformation-sensitive electronic states in the absence of hydrogen. The calculational results are given and discussed for a trunsition metal, Pd. Electronic structure calculations in the presence of hydrogen are outlined and hydrogen embrittlement in transition metals is discussed in terms of electronic states. 展开更多
关键词 hydrogen embrittlement transition metal electronic structure electron energy
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Influence of boron-doping on the H2-induced environmental embrittlement of Ni3Fe intermetallics 被引量:4
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作者 石丹丹 陈业新 +1 位作者 万晓景 LIU Chain Tsuan 《Journal of Shanghai University(English Edition)》 CAS 2007年第2期102-105,共4页
In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B (wt%) alloys in gaseous hydrogen was investigated. The result shows that the ductility of the disordered Ni3Fe is signif... In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B (wt%) alloys in gaseous hydrogen was investigated. The result shows that the ductility of the disordered Ni3Fe is significantly larger than that of ordered material in gaseous hydrogen. However, the ductility of ordered Ni3Fe doped with 0.03%B is nearly the same as that of disordered one indicating the obvious suppressing effect of boron on the H2-induced embrittlement. Based on the segregation behavior of boron in Ni3A1, it is proposed that the suppressing effect of boron in Ni3Fe on the H2-induced embrittlement is attributed to the segregation of boron on grain boundaries, thereby reducing the hydrogen diffusivity along the grain boundaries. 展开更多
关键词 hydrogen embrittlement Ni3Fe alloy boron addition
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Microstructure and embrittlement of the fine-grained heat-affected zone of ASTM4130 steel 被引量:2
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作者 Li-ying Li Yong Wang Tao Han Chao-wen Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第4期419-423,共5页
The mechanical properties and microstructure features of the fine-grained heat-affected zone(FGHAZ) of ASTM4130 steel was investigated by optical microscope(OM),scanning electron microscope(SEM),transmission ele... The mechanical properties and microstructure features of the fine-grained heat-affected zone(FGHAZ) of ASTM4130 steel was investigated by optical microscope(OM),scanning electron microscope(SEM),transmission electron microscope(TEM),and welding thermal simulation test.It is found that serious embrittlement occurs in the FGHAZ with an 81.37% decrease of toughness,compared with that of the base metal.Microstructure analysis reveals that the FGHAZ is mainly composed of acicular,equiaxed ferrite,granular ferrite,martensite,and martensite-austenite(M-A) constituent.The FGHAZ embrittlement is mainly induced by granular ferrite because of carbides located at its boundaries and sub-boundaries.Meanwhile,the existence of martensite and M-A constituent,which distribute in a discontinuous network,is also detrimental to the mechanical properties. 展开更多
关键词 ASTM4130 steel WELDING heat-affected zone MICROSTRUCTURE embrittlement
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KINETICS OF TEMPER EMBRITTLEMENT IN 2.25Cr-1Mo STEEL USED FOR HOT-WALL HYDROFINING REACTORS 被引量:2
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作者 J.Z.Tan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第2期139-146,共8页
Based on the theory of grain boundary segregation, a kinetics model of temper em-brittlement caused by long-term service for hot-wall hydrofining reactors was studied.The kinetics model was applied to phosphorus (P) s... Based on the theory of grain boundary segregation, a kinetics model of temper em-brittlement caused by long-term service for hot-wall hydrofining reactors was studied.The kinetics model was applied to phosphorus (P) segregation in 2.25Cr-1Mo steelused for a hot-wall hydrofining reactor, and the kinetics of grain boundary segrea-tion of impurity P in the steel exposed to the process environment of the hydrofiningreactor was calculated on the basis of the model. The Auger electron spectroscopytest was performed in order to determine the grain boundary concentration of P. Theexperimental result is agreement with the theoretical calculated data. The results showthat the kinetics equation is reasonable for predicting the levels of grain boundarysegregation of impurity P in 2.25Cr-1Mo steel used for hot-wall hydrofining reactors. 展开更多
关键词 hydrofining reactor 2.25Cr-1Mo steel temper embrittlement KINETICS
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Effect of Ordering on Embrittlement of Ni4Mo Alloy in Hydrogen Gas 被引量:2
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作者 程晓英 李慧改 《Journal of Shanghai University(English Edition)》 CAS 2005年第6期544-549,共6页
The fracture behavior of disordered and ordered Ni4Mo alloy was investigated by tensile tests in hydrogen gas or during hydrogen charging. The results show that the ductility of the disordered alloy decreased slightly... The fracture behavior of disordered and ordered Ni4Mo alloy was investigated by tensile tests in hydrogen gas or during hydrogen charging. The results show that the ductility of the disordered alloy decreased slightly with the hydrogen pressure increasing, while that of the ordered alloy decreased rapidly with the hydrogen pressure increasing. However, the ductility of both disordered and ordered alloys reduced similarly seriously with the charging current density increasing. Therefore, the mechanism of order-induced embrittlement of Ni4 Mo alloy in hydrogen gas is supposed to be that atomic order accelerates the kinetics of the catalytic reaction for the dissociation of molecular H2 into atomic H. 展开更多
关键词 Ni4Mo alloy hydrogen embrittlement order DISORDER hydrogen gas hydrogen charging.
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Investigation on RQ Embrittlement Mechanism of FeCuNbSiB Soft Magnetic Alloy 被引量:1
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作者 CAO Xing-guo HUANG Jin-liang +1 位作者 CHEN Wen-zhi ZHOU Shou-xiong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2000年第2期45-49,共5页
The XRD, TEM, PAT, Curie temperature and internal friction methods were used to study systematically the embrittlement mechanism of rapidly quenched ( RQ ) nanocrystalline soft magnetic alloy Fe73.5Cu1Nb3Si13.5B9.The ... The XRD, TEM, PAT, Curie temperature and internal friction methods were used to study systematically the embrittlement mechanism of rapidly quenched ( RQ ) nanocrystalline soft magnetic alloy Fe73.5Cu1Nb3Si13.5B9.The test results confirmed that the RQ embrittlement mechanism of amorphous alloy FeCuNbSiB was not related to crystallization but that was related to structural relaxation. Furthermore, the structural relaxation temperature of amorphous alloy FeCuNbSiB was much lower than that of used commonly amorphous alloy Fe78B13Si9. It meant that the RQ embrittlement is easier to happen for nanocrystalline alloy FeCuNbSiB than amorphous alloy Fe-B-Si. 展开更多
关键词 FeCuNbSiB RQ embrittlement MECHANISM structural relaxation CRYSTALLIZATION
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STUDY OF MECHANISM OF RQ EMBRITTLEMENT OF Fe_(73.5)Cu_1-Nb_3Si_(13.5)B_9 NANOCRYSTALLINE SOFT MAGNETIC ALLOY 被引量:1
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作者 X.G.Cao,J.L.Huang,E.Sukedai,Y.G.Wang,W.Z.Chen and S.X.Zhou Henan University of Science and Technology, Luoyang 471003, China Okayama University of Science, Okayama 700, Japan Beijing Laboratory of Electron Microscope, The Chinese Academy of Sciences, Beij 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第4期363-368,共6页
Rapidly quenching embrittlement (RQE) sometimes appears in nanocrystalline soft magnetic alloy (FINEMET) during production process. As a re-sult of RQE the ductility of the as-quenched ribbon drops seriously. The mech... Rapidly quenching embrittlement (RQE) sometimes appears in nanocrystalline soft magnetic alloy (FINEMET) during production process. As a re-sult of RQE the ductility of the as-quenched ribbon drops seriously. The mechanism of RQE has been elucidated in the recent works of current authors. R was believed that RQE is due to the structural relaxation but not related to α-Fe(Si) crystallization. In this paper, the high resolution TEM (HRTEM) method and image digital processing were applied to analyze the HRTEM images of two FINEMET rapidly quenched ribbons with different thicknesses in detail. In the thinner ductile sample, the ordering domains with the size of about 3nm are observed. In the thicker RQE sample, the metastable nanocrystalline domains with the size of 18nm are observed along with the structural relaxation. These domains seem to have Fe3B-like metastable phase struc-ture on nanometer scale. The result indicates that the local atomic ordering regions extend when RQE induced by structural relaxation occurs. 展开更多
关键词 HRTEM FINEMET rapidly quenching embrittlement mecha-nism
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ATOMIC SCALE MECHANISM OF RESTRAINED EMBRITTLEMENT IN AMORPHOUS Fe_(78)B_(13)Si_9 ALLOY BY ELECTRIC PULSE RAPID ANNEALING 被引量:3
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作者 J.L. Huang X.G. Cao +2 位作者 E. Sukedai S. Yamasaki and H.C.Gu(Department of Materials Engineering, Luoyang Institute of Technology, Luoyang 471039, China)(Department of Mechanical Engineering, Okayama University of Science, 1-1 Ridai-Cho,Okayama City,Okayma 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1998年第4期286-290,共5页
The direct observations of the atomic arrangements in both conventional furnace annealed and electric pulse rapid annealed Fe78B13Si9 amorphous alloy have been conducted by the lattice imaging technique in a higt reso... The direct observations of the atomic arrangements in both conventional furnace annealed and electric pulse rapid annealed Fe78B13Si9 amorphous alloy have been conducted by the lattice imaging technique in a higt resolution electron microscope. The results showed that the embrittlement of the alloy was related to the extent of atomic rearrangements during the annealing processes. The embrittlement of the alloy after 1hour conventional furnace annealing at about 270℃ is caused by the sufficient atomic rearrangements which are characterized by the growth of some bct Fe3B-like atomic short range ordering regions already existed in the as-quenched structure. Electric pulse rapid annealing can effectively retard the above-mentioned atomic rearrangements and thus restrain the embrittlement. The embrittlement only occurs when certain amount of bcc α-Fe nanocrystals are precipitated in the amorphous matrix during electric pulse rapid annealing. 展开更多
关键词 Fe_(78)B_(13)Si_9 amorphous alloy embrittlement electric pulse rapid annealing high resolution electron microscopy
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Effect of δ Phase on Hydrogen Embrittlement of Inconel 718 by Notch Tensile Tests 被引量:1
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作者 LiufaLIU ChenLU +2 位作者 WenjiangDING AkioHirose KojiroF.Kobayashi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第2期256-260,共5页
The effect of δ phase on the hydrogen embrittlement (HE) sensitivity of Inconel 718 was investigated by conducting notch tensile tests. Notch tensile specimens with various precipitation morphologies of δ phase were... The effect of δ phase on the hydrogen embrittlement (HE) sensitivity of Inconel 718 was investigated by conducting notch tensile tests. Notch tensile specimens with various precipitation morphologies of δ phase were prepared with different heat treatments, and hydrogen was charged into the tensile specimens before tensile tests via a cathodic charging process. The loss of notch tensile strength (NTS) due to the charged hydrogen was used to evaluate the hydrogen embrittlement sensitivity. The results show that δ phase has deleterious effect on NTSs, and the fracture of hydrogen-charged specimens initiated near the notch surfaces. The loss of NTS caused by precharged hydrogen can be greatly decreased by dissolving δ phase. δ-free Inconel 718 alloy is proposed for the applications in hydrogen environments. 展开更多
关键词 SUPERALLOY Hydrogen embrittlement δ phase Inconel 718
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