Fe-12Mn-7Al-0.6C-(V)轻质钢力学行为
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摘要
为减轻汽车用钢的质量,实现汽车轻量化设计,研究了冷轧Fe-12Mn-7Al-0.6C-(V)轻质钢在不同温度下退火的组织和力学行为。结果表明,随着退火温度的升高,奥氏体体积分数增加,晶粒尺寸增大;合金的强度下降,塑性先增加后下降。材料的应变硬化行为呈现3阶段硬化。在变形过程中,奥氏体中发生平面滑移,铁素体中发生波状滑移。随着变形量的增加,在奥氏体中形成不同方向的滑移带,铁素体中形成胞状结构。钒的添加可同时提高材料的强度和塑性。
In order to reduce the weight of automotive steel and achieve the lightweight design of automobiles,the microstructures and mechanical behavior of cold rolled Fe-12Mn-7Al-0.6C-(V)steels annealed at different temperatures were investigated.The results showed the volume fractions of austenite and grain sizes increased with increasing the annealing temperature.The strengths of the steels decreased and the ductility of the steels increased first and then decreased as the annealing temperature increased.The strain hardening behavior exhibited a three-stage characteristic.During the deformation process,planar slip occurred in austenite and wavy slip occurred in ferrite.With the increase of deformation amount,slip bands in different directions were formed in austenite and cellular structures were formed in ferrite.The addition of V enhanced both strength and ductility of the material.
In order to reduce the weight of automotive steel and achieve the lightweight design of automobiles,the microstructures and mechanical behavior of cold rolled Fe-12Mn-7Al-0.6C-(V)steels annealed at different temperatures were investigated.The results showed the volume fractions of austenite and grain sizes increased with increasing the annealing temperature.The strengths of the steels decreased and the ductility of the steels increased first and then decreased as the annealing temperature increased.The strain hardening behavior exhibited a three-stage characteristic.During the deformation process,planar slip occurred in austenite and wavy slip occurred in ferrite.With the increase of deformation amount,slip bands in different directions were formed in austenite and cellular structures were formed in ferrite.The addition of V enhanced both strength and ductility of the material.
引文
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[2]赵爱民,张宇光,赵征志,等.Al与P对TRIP钢固态相变的影响[J].材料热处理学报,2011,32(4):82.
[3]肖鸿飞,李壮,李平瑞.以Al代Si对TRIP钢力学性能的影响[J].热加工工艺,2009,38(10):18.
[4]龚志华,赵莉萍,赵鸣,等.部分Al替代Si后TRIP钢的贝氏体转变[J].金属热处理,2011,36(7):32.
[5] Kim Y G,Park Y S,Han J K.Low temperature mechanical behavior of microalloyed and controlled-rolled Fe-Mn-Al-C-X alloys[J].Metallurgical Transactions,1985,16(9):1689.
[6] Yoo J D,Hwang S W,Park K T.Origin of extended tensile ductility of a Fe-28Mn-10Al-1Csteel[J].Metallurgical and Materials Transactions A,2009,40(7):1520.
[7] Yoo J D,Hwang S W,Park K T.Factors influencing the tensile behavior of a Fe-28Mn-9Al-0.8Csteel[J].Materials Science and Engineering A,2009,508:234.
[8] WU Z Q,DING H,AN X H,et al.Influence of Al content on the strain-harding behavior of aged low density Fe-Mn-Al-C steels with high Al content[J].Materials Science and Engineering A,2015,693:187.
[9] DING H,HAN D,ZHANG J,et al.Tensile deformation behavior analysis of low density Fe-18Mn-10Al-xC steels[J].Materials Science and Engineering A,2016,652:69.
[10]杨富强,宋仁伯,孙挺,等.Fe-Mn-Al轻质高强钢组织和力学性能研究[J].金属学报,2014,50(8):897.
[11] Park K T,Jin K G,Han S H,et al.Stacking fault energy and plastic deformation of fully austenitic high manganese steels:Effect of Al addition[J].Materials Science and Engineering A,2010,527:3651.
[12] Welsch E,Ponge D,Haghighat S M H,et al.Strain hardening by dynamic slip band refinement in a high-Mn lightweight steel[J].Acta Materialia,2016,116:188.
[13] WU Z Q,DING H,LI H Y,et al.Microstructural evolution and strain hardening behavior during plastic deformation of Fe-12Mn-8Al-0.8Csteel[J].Materials Science and Engineering A,2013,508:150.
[14]杨富强,宋仁伯,张磊峰,等.900 MPa级Fe-Mn-Al系轻质高强钢组织性能研究[C]//第九届中国钢铁年会论文集.北京:中国金属学会,2013:1.
[15] LIU D G,CAI M H,DING H,et al.Control of inter/intragranularκ-carbides and its influence on overall mechanical properties of a Fe-11Mn-10Al-1.25Clow density steel[J].Materials Science and Engineering A,2018,715:25.
[16]胡俊,刘永前,梁文,等.退火温度对冷轧中锰钢力学性能的影响[J].钢铁研究,2016,44(3):21.
[17] DING H,WU Z Q,HAN D,et al.Microstructural evolution and mechanical behavior of low density Fe-Mn-Al-C steel with high stacking fault energy[J].Materials Science Forum,2016,879:436.
[18]雍岐龙,孙新军,郑磊,等.钢铁材料中第二相的作用[J].科技创新导报,2009,8(2):2.