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Study of the effect of magnetic fields on static degradation of Fe and Fe-12Mn-1.2C in balanced salts modified Hanks’solution
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作者 Irene Lim′on Marta Multigner +4 位作者 Carlo Paternoster Marcela Lieblich Bel′en Torres Diego Mantovani Joaquín Rams 《Bioactive Materials》 SCIE CSCD 2024年第10期524-540,共17页
Iron and its alloys are attractive as biodegradable materials because of their low toxicity and suitable mechanical properties;however,they generally have a slow degradation rate.Given that corrosion is an electrochem... Iron and its alloys are attractive as biodegradable materials because of their low toxicity and suitable mechanical properties;however,they generally have a slow degradation rate.Given that corrosion is an electrochemical phenomenon where an exchange of electrons takes place,the application of magnetic fields from outside the body may accelerate the degradation of a ferrous temporary implant.In the present study,we have investigated the effect of alternating and direct low magnetic field(H=6.5 kA/m)on the corrosion process of pure iron(Fe)and an iron-manganese alloy(FeMnC)in modified Hanks’solution.A 14-day static immersion test was performed on the materials.The corrosion rate was assessed by mass and cross-sectional loss measurements,scanning electron microscopy,X-ray diffractometry,Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy before and after degradation.The results show that the presence of magnetic fields significantly accelerates the degradation rate of both materials,with the corrosion rate being twice as high in the case of Fe and almost three times as high for FeMnC.In addition,a homogenous degradation layer is formed over the entire surface and the chemical composition of the degradation products is the same regardless of the presence of a magnetic field. 展开更多
关键词 Biometals Biodegradable iron alloy Corrosion Magnetic fields Biodegradable implant MAGNETOHYDRODYNAMICS
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Recycling of Glass Fibers from Fiberglass Polyester Waste Composite for the Manufacture of Glass-Ceramic Materials 被引量:2
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作者 Felix Antonio López Maria Isabel Martín +3 位作者 Irene García-Díaz Olga Rodríguez Francisco Jose Alguacil Maximina Romero 《Journal of Environmental Protection》 2012年第8期740-747,共8页
This work presents the feasibility of reusing a glass fiber resulting from the thermolysis and gasification of waste composites to obtain glass-ceramic tiles. Polyester fiberglass (PFG) waste was treated at 550℃ for ... This work presents the feasibility of reusing a glass fiber resulting from the thermolysis and gasification of waste composites to obtain glass-ceramic tiles. Polyester fiberglass (PFG) waste was treated at 550℃ for 3 h in a 9.6 dm3 thermolytic reactor. This process yielded an oil (≈24 wt%), a gas (≈8 wt%) and a solid residue (≈68 wt%). After the polymer has been removed, the solid residue is heated in air to oxidize residual char and remove surface contamination. The cleaning fibers were converted into glass-ceramic tile. A mixture consisting of 95 wt% of this solid residue and 5% Na2O was melted at 1450℃ to obtain a glass frit. Powder glass samples (<63 μm) was then sintered and crystallized at 1013℃, leading to the formation of wollastonite-plagioclase glass-ceramic materials for architectural applications. Thermal stability and crystallization mechanism have been studied by Differential Thermal Analysis. Mineralogy analyses of the glass-ceramic materials were carried out using X-ray Diffraction. 展开更多
关键词 Valorisation WASTE COMPOSITE THERMOLYSIS GASIFICATION Glass Fiber GLASS-CERAMIC
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A review of the thermal stability of metastable austenite in steels:Martensite formation 被引量:5
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作者 Yong Li David San Martín +2 位作者 Jinliang Wang Chenchong Wang Wei Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第32期200-214,共15页
Metastable austenite plays a critical role in achieving improved combinations of high strength and high ductility/toughness in the design of advanced high-strength steels(AHSS). The thermal stability of metastable aus... Metastable austenite plays a critical role in achieving improved combinations of high strength and high ductility/toughness in the design of advanced high-strength steels(AHSS). The thermal stability of metastable austenite determines the transformation characteristics of AHSS and thus primarily determines the microstructure evolution during complex processes, e.g., the quenching and partitioning process, to achieve the desirable microstructure. This study provides a review of the thermal stability of austenite and its influence on martensitic transformation from both experimental and theoretical modeling perspectives. From the experimental perspective, factors affecting the thermal stability are analyzed,the relative sensitivities are compared, and their corresponding mechanisms are discussed. From the theoretical modeling perspective, the most representative kinetic models that describe athermal and isothermal martensitic transformation are reviewed. The advantages, shortcomings, and applicability of each model are discussed. The systematic review of both experimental and theoretical aspects reveals critical factors in tailoring the stability of metastable austenite and, therefore, provides guidance for the design of advanced steels. 展开更多
关键词 AUSTENITE Thermal stability Martensitic transformation Kinetic models
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Influence of V(C,N) Precipitates on Microstructure and Mechanical Properties of Continuous Cooled C-Mn-V 被引量:1
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作者 Carlos Garcia-Mateo Carlos Capdevila +3 位作者 Juan Cornide Jesus Chao Francisca G Caballero Carlos Garcia de Andres 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第S1期266-270,共5页
The effect of chemical composition and processing parameters on the formation of acicular ferrite and/or bainite has been investigated.In particular,this paper deals with the influence that N through its combination w... The effect of chemical composition and processing parameters on the formation of acicular ferrite and/or bainite has been investigated.In particular,this paper deals with the influence that N through its combination with V,as V(C,N) precipitates,has on the decomposition of austenite.Likewise,the intragranular nucleation potency of V(C,N) precipitates is analyzed through the continuous cooling transformation diagrams (CCT) of two C-Mn-V steels with different contents of N.Results reported in this work allow us to conclude that acicular ferrite can only be achieved alloying with vanadium and nitrogen,meanwhile bainite is promoted in steels with a low level of nitrogen.It is concluded that higher strength values are obtained in acicular ferrite than in bainitic steel but a similar brittle-ductile transition temperature (BDT),and lower values of impact absorbed energy (KV) has been recorded in nitrogen-rich steel. 展开更多
关键词 acicular ferrite BAINITE vanadium precipitates mechanical properties
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Warm Forged Medium Carbon V Steel
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作者 Carlos Garcia-Mateo Beatriz Lopez Jose Maria Rodriguez-Ibabe 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第S1期822-826,共5页
Nowadays there is a continuous demand,particularly from the automotive industry,for cheaper,lighter and more reliable components.It is not surprising then that steel research has been focused during the last decades i... Nowadays there is a continuous demand,particularly from the automotive industry,for cheaper,lighter and more reliable components.It is not surprising then that steel research has been focused during the last decades in new qualities and processes.This paper is dealing with the use of vanadium microalloyed steels on one of those new processes,warm forging.For its low precipitation temperature and its recognised ability to strengthen steel microstructures via austenite grain growth control,precipitation hardening and interference of the static recrystallization process,vanadium in microalloyed steels seem to be an appropriate candidate for warm forging. 展开更多
关键词 warm forging vanadium microalloyed steels
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