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Interaction of Hydrogen and Retained Austenite in Bainite/Martensite Dual-Phase High Strength Steel
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作者 GUJia-lin CHANGKai-di +2 位作者 FANGHong-sheng YANGZhi-gang BAIBing-zhe 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2004年第1期42-46,共5页
The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels(U20Si and U20DSi)were investigated by electrochemical permeation technique.The hydrogen diffusivity was calculated from data of... The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels(U20Si and U20DSi)were investigated by electrochemical permeation technique.The hydrogen diffusivity was calculated from data of permeation delay time,and the diffusion coefficient in U20 Si is far less than that in U20 DSi.Moreover,the hydrogen diffusivity decreases as the volume percent of retained austenite increases.The experiment results show that there are different hydrogen trappings and different volume percents of retained austenite in U20 Si and U20 DSi.The retained austenite is precipitated as films.The trap binding energy for the retained austenite and hydrogen is calculated to be 40.4kJ·mol-1. 展开更多
关键词 BAINITE martensite dual-phase high strength steel electrochemical permeation technique diffusion coefficient retained austenite trap binding energy
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Corrosion behavior of tempered dual-phase steel embedded in concrete 被引量:2
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作者 Oguzhan Kelestemur Mustafa Aksoy Servet Ylldlz 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第1期43-50,共8页
Dual-phase (DP) steels with different martensite contents were obtained by appropriate heat treatment of an SAE1010 structural carbon steel, which was cheap and widely used in the construction industry. The corrosio... Dual-phase (DP) steels with different martensite contents were obtained by appropriate heat treatment of an SAE1010 structural carbon steel, which was cheap and widely used in the construction industry. The corrosion behavior of DP steels in concrete was investigated under various tempering conditions. Intercritical annealing heat treatment was applied to the reinforcing steel to obtain DP steels with different contents of martensite. These DP steels were tempered at 200, 300, and 400℃ for 45 min and then cooled to room temperature. Corrosion experiments were conducted in two stages. In the first stage, the corrosion potential of DP steels embedded in concrete was measured every day for a period of 30 d based on the ASTM C 876 standard. In the second stage, the anodic and cathodic polarization values of these steels were obtained and subsequently the corrosion currents were determined with the aid of cathodic polarization curves. It was observed that the amount of second phase had a definite effect on the corrosion behavior of the DP steel embedded in concrete. As a result of this study, it is found that the corrosion rate of the DP steel increases with an increase in the amount of martensite. 展开更多
关键词 dual-phase steel CORROSION tempering treatment martensite CONCRETE
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Influence of Martensite Volume Fraction on Mechanical Properties of High-Mn Steel
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作者 Rashid Khan Tasneem Pervez Sayyad Zahid Qamar 《Journal of Minerals and Materials Characterization and Engineering》 2013年第6期293-300,共8页
Elastic-plastic deformation behavior of austenitic, martensitic, and austenitic-martensitic high-Mn steels is investigated by using crystal plasticity theory. The development of expandable pipes made of two-phase stee... Elastic-plastic deformation behavior of austenitic, martensitic, and austenitic-martensitic high-Mn steels is investigated by using crystal plasticity theory. The development of expandable pipes made of two-phase steel for oil and gas well applications is needed for improved and efficient recovery of hydrocarbons from difficult reservoirs. The current research is aimed at improving the down-hole post-expansion material properties of expandable pipes. A mathematical model is first developed based on finite-deformation crystal plasticity theory assuming that slip is the prime mode of plastic deformation. The developed model is then numerically implemented by using the finite element software ABAQUS, through a user defined subroutine. Finite element simulations are performed for austenitic, martensitic, and austenitic-martensitic steels having different proportions of martensite in an austenite matrix. Three primary modes of loading are considered: uniaxial tension, compression and simple shear. The variation in yield strength, hardening pattern and dissipated energy is observed and analyzed. 展开更多
关键词 dual-phase steel martensite MECHANICAL Properties MICROMECHANICAL Modeling FINITE ELEMENT Method
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Effect of Microstructure on Corrosion Fatigue Behavior of 1500 MPa Level Carbide-Free Bainite/Martensite Dual-Phase High Strength Steel 被引量:4
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作者 XU Lei WEI Dong-yuan YU Yang ZHANG Han BAI Bing-zhe 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第4期63-67,共5页
Influence of microstructure of the experimental steels on the corrosion fatigue behavior in 3.5% of NaCl aqueous solution was studied.Experimental results show that compared with the full martensite(FM)steel,the car... Influence of microstructure of the experimental steels on the corrosion fatigue behavior in 3.5% of NaCl aqueous solution was studied.Experimental results show that compared with the full martensite(FM)steel,the carbide-free bainite/martensite(CFB/M)steel has higher corrosion fatigue strength and corrosion fatigue crack threshold(ΔKthcf),and lower corrosion crack propagation rate [(da/dN)cf]. 展开更多
关键词 high strength steel carbide-free bainite/martensite dual-phase steel corrosion fatigue
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Bake-Hardening Response of High Martensite Dual-Phase Steel with Different Morphologies and Volume Fractions
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作者 Mustafa Trkmen Sleyman Gndz 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第2期279-289,共11页
Bake-hardening behaviour of carbon steel with different martensite morphologies and volume fraction was investigated. The specimens with fibrous and bulky martensite were prestrained in tension by 4%. After this, they... Bake-hardening behaviour of carbon steel with different martensite morphologies and volume fraction was investigated. The specimens with fibrous and bulky martensite were prestrained in tension by 4%. After this, they were unloaded and bake hardened at 180 ℃ for 10-160 min. It was found that dual-phase steel samples which were bake hardened at 180 ℃ for 20 rain showed an increase in the yield stress (YS) and ultimate tensile stress (UTS) but a decrease in ductility. Further increase in the bake-hardening time of 80 or 160 min has reduced the YS and UTS, but increased the ductility. △σ (increase in stress due to bake hardening), YS and UTS values are higher for the microstructure containing fibrous martensite compared to the microstructure-containing bulky martensite. It was also observed that at a given baking temperature Aa, YS and UTS increased by volume of martensite. 展开更多
关键词 dual-phase steel Bake hardening martensitic transformation
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Microstructure-Properties Correlation of Dual Phase Steels Produced by Controlled Rolling Process 被引量:5
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作者 A.Fallahi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第5期451-454,共4页
The purpose of this research is to quantify the effects of compositional and processing parameters on the microstruc-ture and properties of dual phase steel produced directly by hot rolling and rapid cooling. Steels w... The purpose of this research is to quantify the effects of compositional and processing parameters on the microstruc-ture and properties of dual phase steel produced directly by hot rolling and rapid cooling. Steels with the base composition of 0.1%C, 1.4%Si, and 1.0%Mn with additions of 0.5%Cr to influence hardenability, 0.04%Nb to retard recrystallization in the latter stages of rolling, or 0.02%Ti to inhibit grain growth during and after reheating were investigated. Investigation was made to predict microstructure evolution and to correlate microstructure with processing parameters. The effects of the important microstructure parameters such as ferrite grain size, martensite volume fraction (VM) and morphology (polygonal or fibrous) on the tensile and impact properties are discussed. Multiple linear regression analysis of the ultimate tensile strength has shown that, increasing VM and martensite microhardness and grain refinement of ferrite are the major contributions to increase the strength of the steel. It was found that the dual-phase steel produced by controlled rolling process, with a microstructure which consisted of fine grained ferrite (4 um) and 35%~40% fibrous martensite, presented optimum tensile and impact properties because of enhanced resistance to crack propagation. 展开更多
关键词 dual-phase steel martensite Controlled rolling
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Improved mechanical properties of V-microalloyed dual phase steel by enhancing martensite deformability 被引量:2
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作者 Jingbin Zhang Yinrui Sun +2 位作者 Zhijie Ji Haiwen Luo Feng Liu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第16期139-153,共15页
A good combination of ultimate tensile strength(UTS)up to 1365 MPa and total strain to failure(StF)to 15.5%has been achieved due to deformable martensite in the invented vanadium-microalloyed dual-phase(DP)steel,which... A good combination of ultimate tensile strength(UTS)up to 1365 MPa and total strain to failure(StF)to 15.5%has been achieved due to deformable martensite in the invented vanadium-microalloyed dual-phase(DP)steel,which was manufactured by two-stage annealing of cold rolled steel strip.The employed extensive characterizations revealed that the ductile martensitic phase in this DP steel differentiated from ordinarily low-carbon martensitic lath in both morphology and lattice structure.Complex coherent orientation relationships between ferrite,reverse austenite,martensitic phase and vanadium carbide(VC)do exist,leading to a new martensitic transformation mechanism and resultant dual-phase microstructure.Besides,a detailed characterization including essential phase transformation analysis in combination with in situ TEM observation,shows that,all the essential processing including recrystallization,reverse austenitic and martensitic transformation,in debt to the particular effects of VC,can be recognized as phase transformations with higher thermodynamic driving force and higher kinetic energy barrier as compared to previously common processing,which actually changes the microstructure and,indirectly leads to higher strength and higher ductility.This synergy of thermodynamics and kinetics can be generalized to improve mechanical properties of present steels. 展开更多
关键词 dual-phase steel DEFORMABILITY martensitic phase THERMODYNAMICS KINETICS
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