Effect of Strain Rate on Deformation Behavior of Fe-11Mn-2Al-0.2C Medium-Mn Steel

doi:10.12068/j.issn.1005-3026.2020.07.020

Abstract

Abstract: Mechanical properties and deformation behavior of Fe-11Mn-2Al-0.2C medium-Mn steel tensioned at different strain rates(2×10^-4~200s^-1) were studied. The results show that tensile strength decreases monotonically from 1456MPa to 1086MPa with the increase of strain rate. The total elongation decreases from 48.2% to 38.2% during the strain rate ranging from 2×10^-4s^-1 to 20s^-1， followed by an increase to 44% when the strain rate reaches 2×10²s^-1. According to the fractography， it is found that with the increase of strain rate， the microstructure of the tested samples are elongated， twisted and cut. The morphology of dimples are transformed from deep-equiaxed shape to shallow oval one， which indicates that the stress state of the tensioned samples is shifted from normal stress to shear stress. Furthermore， deformation mechanism is also greatly affected by the strain rate. Transformation-induced plasticity(TRIP) effect is dominant at low strain rates(2×10^-4~2×10^-3s^-1)， while it is suppressed at medium strain rates(2×10^-2~2s^-1) and twining-induced plasticity(TWIP) effect occurs. At high strain rates(2~200s^-1)， both TRIP and TWIP effect are promoted.

Key words: medium-Mn steel, strain rate, deformation behavior, TRIP effect；TWIP effect

CLC Number:

TP20

CAI Zhi-hui， ZHANG De-liang， ZHOU Yan-jun， WEN Guang-qi. Effect of Strain Rate on Deformation Behavior of Fe-11Mn-2Al-0.2C Medium-Mn Steel[J]. Journal of Northeastern University Natural Science, 2020, 41(7): 1041-1047.

References

[1]史巨元.钢的动态力学性能及应用［M］.北京:冶金工业出版社，1993.(Shi Ju-yuan.Dynamic mechanical properties and application of steel［M］.Beijing:Metallurgical Industry Press，1993.)
[2]韦习成，谢群，符仁红，等.HSLA TRIP钢的动态拉伸行为及其模拟［J］.材料研究学报，2006，20(5):556-560.(Wei Xi-cheng，Xie Qun，Fu Ren-hong，et al.Dynamic tensile behavior of HSLA TRIP steel and its simulation［J］.Journal of Material Research，2006，20(5):556-560.)
[3]Tang Z Y，Huang J N，Ding H，et al.On the dynamic behavior and relationship to mechanical properties of cold-rolled Fe-0.2C-15Mn-3Al steel at intermediate strain rate［J］.Materials Science & Engineering:A，2019，742:423-431.
[4]Xu Z M，Yang Y G，Chen J Y，et al.Effects of strain states on stability of retained austenite in medium Mn steels［J］.Journal of Iron and Steel Research International，2017，24(11):76-80.
[5]Sahu P，Curtze S，Das A.Stability of austenite and quasi-adiabatic heating during high-strain-rate deformation of twinning-induced plasticity steels［J］.Scripta Materialia，2010，62(1):5-8.
[6]吴志强，唐正友，李华英，等.应变速率对低C高Mn TRIP/TWIP钢组织演变和力学行为的影响［J］.金属学报，2012，48(5):593-600.(Wu Zhi-qiang，Tang Zheng-you，Li Hua-ying，et al.Effect of strain rate on microstructure evolution and mechanical behavior of a low C high Mn TRIP/TWIP steels［J］.Acta Metallurgica Sinica，2012，48(5):593-600.)
[7]Wei X C，Fu R Y，Li L.Tensile deformation behavior of cold-rolled TRIP-aided steels over large range of strain rates［J］.Materials Science & Engineering:A，2007，465(1):56-62.
[8]Tian R，Li L，De Cooman B C，et al.Effect of temperature and strain rate on dynamic properties of low silicon TRIP steel［J］.Journal of Iron and Steel Research International，2006，13(3):51-56.
[9]宋丽娜，兰鹏，刘春秀，等.第3代汽车用中锰钢的研究现状［J］.钢铁研究学报，2015，27(7):1-8.(Song Li-na，Lan Peng，Liu Chun-xiu，et al.Research of the third generation medium manganese steel［J］.Journal of Iron and Steel Research，2015，27(7):1-8.)
[10]徐娟萍，付豪，王正，等.中锰钢的研究进展与前景［J］.工程科学报，2019，41(5):557-572.(Xu Juan-ping，Fu Hao，Wang Zheng，et al.Research progress and prospect of medium manganese steel［J］.Journal of Engineering Science，2019，41(5):557-572.)
[11] Lee S，Estrin Y，De Cooman B C.Effect of the strain rate on the TRIP-TWIP transition in austenitic F-12 pct Mn-0.6 pct C TWIP steel［J］.Metallurgical and Materials Transactions A，2014，45(2):717-730.
[12]Lee S，De Cooman B C.Tensile behavior of intercritically annealed 10 pct Mn multi-phase steel［J］.Metallurgical and Materials Transactions A，2014，45(2):709-716.
[13]Li Z C，Ding H，Cai Z H.Mechanical properties and austenite stability in hot-rolled 0.2C-1.6/3.2Al-6Mn-Fe TRIP steel［J］.Materials Science & Engineering:A，2015，639(9):559-566.
[14]Zhou N P，Song R B，Li X，et al.Dependence of austenite stability and deformation behavior on tempering time in an ultrahigh strength medium Mn TRIP steel［J］.Materials Science & Engineering:A，2018，738(19):153-162.
[15]Han Q H，Zhang Y L，Wang L.Effect of annealing time on microstructural evolution and deformation characteristics in 10Mn1.5Al TRIP steel［J］.Metallurgical and Materials Transactions A，2015，46(5):20-27.
[16]齐祥羽，朱晓雷，胡军，等.低碳中锰 Q690F 高强韧中厚板生产技术［J］.东北大学学报( 自然科学版)，2019，40(4):483-487.(Qi Xiang-yu，Zhu Xiao-lei，Hu Jun，et al.Project technology low-C medium-Mn Q690F high strength and toughness mid-thick steel plate［J］.Journal of Northeastern University(Natural Science)，2019，40(4):483-487.)
[17]Heo Y U，Suh D W，Lee H C.Fabrication of an ultrafine-grained structure by a compositional pinning technique［J］.Acta Materialia，2014，77:236-247.
[18]Sun R，Xu W，Wang C，et al.Work hardening behavior of ultrafine grained duplex medium-Mn steels processed by ART-annealing［J］.Steel Research International，2012，83(4):316-321.
[19]Cai Z H，Jing S Y，Li H Y，et al.The influence of microstructural characteristics on yield point elongation phenomenon on Fe-0.2C-11Mn-2Al steel［J］.Material Science & Engineering:A，2019，739:17-25.
[20]Sachdev A K，Hunter J E Jr.Thermal effects during uniaxial straining of steels［J］.Metallurgical and Materials Transactions A，1982，13(6):1063-1067.
[21]Yen H W，Ooi S W，Eizadjou M，et al.Role of stress-assisted martensite in the design of strong ultrafine-grained duplex steels［J］.Acta Materialia，2015，82:100-114.
[22]Lee S，Lee S J，Kumar S S，et al.Localized deformation in multiphase，ultra-fine-grained 6 pet Mn transformation-induced plasticity steel［J］.Metallurgical and Materials Transactions A，2011，42(12):3638-3651.
[23]Saeed-Akbari A，Imlau J，Prahl U，et al.Derivation and variation in composition-dependent stacking fault energy maps based on subregular solution model in high-manganese Steels［J］.Metallurgical and Materials Transactions A，2009，40(13):3076-3090.
[24]Asghari A，Zarei-Hanzaki A，Eskandari M.Temperature dependence of plastic deformation mechanisms in a modified transformation-twinning induced plasticity steel［J］.Materials Science & Engineering:A，2013，579:150-156.
[25]Allain S，Chateau J P，Bouaziz O，et al.Correlations between the calculated stacking fault energy and the plasticity mechanisms in Fe-Mn-C alloys［J］.Materials Science & Engineering:A，2004，387/388/389:158-162.
[15]关守平，房少纯.一种新型的区间-粒子群优化算法［J］.东北大学学报(自然科学版)，2012，33(10):1381-1384.(Guan Shou-ping，Fang Shao-chun.A new interval particle swarm optimization algorithm［J］.Journal of Northeastern University(Natural Science)，2012，33(10):1381-1384.)