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twinning induced remarkable strain hardening in a novel Fe_(50)Mn_(20)Cr_(20)Ni_(10) medium entropy alloy

Journal of Iron and Steel Research(International) 2021年第11期28卷 1463-1470页

作者： Ming-jie Qin Xi Jin Min Zhang Hui-jun Yang Jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024ShanxiChina State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The microstructures and tension properties of Fe_(50)Mn_(20)Cr_(20)Ni_(10) medium entropy alloy(MEA)were investigated,which was produced by vacuum induction melting and subsequently was homogenized at 1200 C for 6 *** characterization shows the single-phase solid solution with face-centered cubic structure by means of transmission electron microscopy and scanning electron microscopy combined with energy disperse *** Fe-MEA has an ultimate tensile strength of 550±10 MPa and a high strain hardening exponent,n,of 0.41 as well as a higher ductility(60%)than those of CrMnFeCoNi *** single-phase solid solution deforms plastically via dislocations and *** boundaries associated with deformation twinning impede dislocation motion,enhancing the strain hardening *** article focuses on the insights into the concept of Fe-MEAs and provides a potential direction for the future development of high entropy alloys and MEAs.

关键词： Medium entropy alloy Alloy design Labusch model twinning induced plasticity Strain hardening

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Unusual relationship between impact toughness and grain size in a high-manganese steel

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Journal of Materials Science & Technology 2021年第30期89卷 122-132页

作者： Pan Xie Shucheng Shen Cuilan Wu Jiehua Li Jianghua Chen Center for High Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha410082China Institute of Casting Research Montanuniversität LeobenA-8700LeobenAustria

The high-manganese steels are important structural materials,owing to their excellent toughness at low ***,the microstructural causes for their unusual properties have not adequately been understood thus ***,we report a reversal relationship between impact toughness and grain size in a high-manganese steel and its unrevealed microscopic mechanisms,which result in an excellent low-temperature toughness of the *** investigations show that with increasing grain size the impact toughness of the steel can be improved drastically,especially at *** electron microscopy characterization reveals that the enhanced impact toughness of the coarse-grained steel is attributed to the twinning induced plasticity and transformation induced plasticity effects,which produce large quantities of deformation twins,ε_(hcp)-martensite andα'_(bcc)-***,in the fine-grained steels,the formation of deformation twins and martensite is significantly inhibited,leading to the decrease of impact *** characterizations also indicate thatε_(hcp)-martensite becomes more stable thanα'_(bcc)-martensite with decreasing temperature,resulting in characteristic microstructures in the coarse-grained samples after impact deformation at liquid nitrogen *** the coarse-grained samples under impact deformation at-80℃,ε_(hcp)-martensite transformation,α'_(bcc)-martensite transformation and deformation twinning all occur simultaneously,which greatly improves the toughness of the steel.

关键词： Toughness Grain size twinning induced plasticity Transformations induced plasticity High-manganese steel

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In-situ observation on the deformation behaviors of Fe-Mn-C TWIP steel

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 646-649页

作者： Zhen-li Mi Di Tang Yong-juan Dai Hai-tao Jiang Jian-chong Lu National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China

The microstructure and crack behaviour of twinning induced plasticity （TWIP） steel during tensile deformation was investigated with in-situ scanning electron microscopy （SEM）. The results show that there are two modes of plastic deformation during tensile test in the Fe-Mn-C TWIP steel： dislocation gliding and deformation twins. During the process of tensile deformation, secondary deformed twins are found. Inclusions have played a role in the course of ductile fracture, and microcracks initiate from inclusions and twin-twin intersections.

关键词： TWIP steel in-situ observation deformation microstructure twinning induced plasticity

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The Effect of Nb on Mechanical Properties of Quenching and Partitioning Steels

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Journal of Iron and Steel Research(International) 2011年第S1期18卷 306-309页

作者： ZHU Shuai,KANG Yong-lin,REN Kang-kang,WANG Chuan (School of Materials Science and Engineering.University of Science and Technology Beijing,Beijing 100083,China) Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

In order to study the effect of alloy elements on mechanical properties of quenching and partitioning steels,the Q and P heat treatments on different chemical composition steels were carried on in *** tensile test results indicated the strength of Nb+Ti-bearing steel was not increasing as expected,but lower than that of the Nb+Ti-free steel,and the elongation was raised to 26% from 9%.The Nb+Ti-bearing steel microstructures after tensile test were detected by TEM and found a certain amount of twins in the deformed microstructure while the deformed microstructure mainly was lath martensite in Nb+Ti-free steel,which means the addition of Nb and Ti elements could cause the twinning induced plasticity by inhibiting the phase transformation from austenite to *** on above analysis,adding trace Nb element could greatly increase the stacking fault energy of the retained austenite,which is beneficial to the formation of twins,and the formation of twins would lower the strength slightly and raise the elongation drastically.

关键词： quenching and partitioning twinning induced plasticity niobium stacking fault energy

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