退火温度对Fe-Mn-Al-C钢组织和拉伸性能的影响

doi:10.13251/j.issn.0254-6051.2021.04.013

金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 77-82.DOI: 10.13251/j.issn.0254-6051.2021.04.013

退火温度对Fe-Mn-Al-C钢组织和拉伸性能的影响

李烨¹, 夏鹏成¹, 谢鲲¹, 曹梅青¹, 谭云亮², 金晓龙³

1.山东科技大学材料科学与工程学院, 山东青岛 266590;
2.山东科技大学山东省与科技部共建矿山灾害防治国家重点实验室, 山东青岛 266590;
3.鞍山钢铁集团钢铁研究所汽车和家用电器钢铁研究所, 辽宁鞍山 114021

收稿日期:2020-12-11 出版日期:2021-04-25 发布日期:2021-05-08
通讯作者: 夏鹏成,副教授,博士,E-mail:xpc328@126.com
作者简介:李烨(1995—),男,硕士研究生,主要研究方向为高强高塑钢,E-mail:965166191@qq.com。
基金资助:
国家重点研发计划(2018YFC0604703);山东省自然科学基金(ZR2018MEM008)

Effect of annealing temperature on microstructure and tensile properties of Fe-Mn-Al-C steel

Li Ye¹, Xia Pengcheng¹, Xie Kun¹, Cao Meiqing¹, Tan Yunliang², Jin Xiaolong³

1. School of Material Science and Engineering, Shandong University of Science and Technology, Qingdao Shandong 266590, China;
2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao Shandong 266590, China;
3. Steel Research Institute of Automotive and Household Appliances, Iron and Steel Research Institute, Anshan Iron and Steel Group, Anshan Liaoning 114021, China

Received:2020-12-11 Online:2021-04-25 Published:2021-05-08

摘要/Abstract

摘要： 采用OM、SEM、TEM和拉伸试验等手段研究了退火温度对Fe-19Mn-2Al-0.6C钢组织和性能的影响。结果表明,退火后试验钢的基体组织为奥氏体。由于回复再结晶的完成程度不同,随着退火温度的升高,晶粒尺寸先减小再增大。同时,退火孪晶的数量逐渐增加,抗拉强度持续降低,但总伸长率先升高然后降低。当施加一定的外部载荷时,在变形过程中会产生大量的变形孪晶和位错。高密度位错在晶界或孪晶界处的缠绕和塞积阻碍了位错的进一步运动。一次孪晶和二次孪生的交割产生的动态Hall-Petch效应,以及位错和孪晶的相互作用共同导致试验钢的高加工硬化能力。Fe-19Mn-2Al-0.6C钢获得最佳综合力学性能的退火温度约为900 ℃,其抗拉强度为947.61 MPa,强塑积为49.30 GPa·%,伸长率为52.03%。

关键词: TWIP钢, 退火, 孪晶, 位错, 拉伸性能

Abstract: Effect of annealing temperature on microstructure and properties of Fe-19Mn-2Al-0.6C steel was investigated by means of OM, SEM, TEM and tensile testing. The results show that after annealing, the matrix structure of the tested steel is austenite. Due to the different completeness of recovery and recrystallization, the grain size decreases first and then increases with the increase of annealing temperature. Meanwhile, the amount of annealing twins gradually increases, the ultimate tensile strength of the steel continues to decrease, but the total elongation increases first and then decreases. When a certain external load is applied to the steel, a large amount of deformation twins and dislocations will be generated during the deformation. The tangle and pile-up of high-density dislocation at grain boundaries or twin-boundaries can hinder the further movement of dislocations remarkably. The dynamic Hall-Petch effect generated by the intersecting of primary twins and secondary twins, and the interaction of dislocations and twins, together result in a high work hardening capacity of the tested steel. The optimized annealing temperature for Fe-19Mn-2Al-0.6C steel is about 900 ℃, at which the best comprehensive mechanical properties can be obtained, with the tensile strength, the strength-ductility balance, and the elongation being 947.61 MPa, 49.30 GPa·% and 52.03%, respectively.

Key words: TWIP steel, annealing, twinning, dislocation, tensile properties

中图分类号:

TG156.1

李烨, 夏鹏成, 谢鲲, 曹梅青, 谭云亮, 金晓龙. 退火温度对Fe-Mn-Al-C钢组织和拉伸性能的影响[J]. 金属热处理, 2021, 46(4): 77-82.

Li Ye, Xia Pengcheng, Xie Kun, Cao Meiqing, Tan Yunliang, Jin Xiaolong. Effect of annealing temperature on microstructure and tensile properties of Fe-Mn-Al-C steel[J]. Heat Treatment of Metals, 2021, 46(4): 77-82.

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退火温度对Fe-Mn-Al-C钢组织和拉伸性能的影响

Effect of annealing temperature on microstructure and tensile properties of Fe-Mn-Al-C steel

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