0.2C-5Mn-1.5Al中锰TRIP钢的显微组织及力学性能

doi:10.13251/j.issn.0254-6051.2020.04.013

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 63-68.DOI: 10.13251/j.issn.0254-6051.2020.04.013

0.2C-5Mn-1.5Al中锰TRIP钢的显微组织及力学性能

王润勋¹, 王宝峰¹, 李岩², 定巍¹, 潘红波³

1. 内蒙古科技大学材料与冶金学院, 内蒙古包头 014010;
2. 内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室, 内蒙古包头 014010;
3. 安徽工业大学工程研究院, 安徽马鞍山 243002

收稿日期:2019-09-22 出版日期:2020-04-25 发布日期:2020-05-08
通讯作者: 定巍,副教授,博士,主要从事先进高强度汽车用钢研究,E-mail:adingwei@126.com
作者简介:王润勋(1993—),男,硕士研究生,E-mail:1084106279@qq.com
基金资助:
国家自然科学基金(51774006,U1860105);内蒙古自然科学基金(2019MS05014)

Microstructure and mechanical properties of 0.2C-5Mn-1.5Al medium manganese TRIP steel

Wang Runxun¹, Wang Baofeng¹, Li Yan², Ding Wei¹, Pan Hongbo³

1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Bayan Obo Multimetallic Resource Comprehensive Utilization Key Lab, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
3. Institute of Engineering, Anhui University of Technology, Ma'anshan Anhui 243002, China

Received:2019-09-22 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 利用相变热力学模拟计算,扫描电镜(SEM),X射线衍射仪(XRD),拉伸试验机等设备系统研究了不同退火工艺下0.2C-5Mn-1.5Al中锰TRIP钢的相变特点及组织性能,通过与不添加Al的0.2C-5Mn中锰TRIP钢进行比较,研究了Al对相变规律及工艺与组织性能的影响规律。结果表明:Al添加提高并扩大了临界区温度范围,使得中锰钢可以选择更高的临界退火温度,这有助于加快奥氏体逆相变过程,缩短退火时间;同时Al的添加促进了C,Mn元素的聚集,有效提高了残留奥氏体含量,增强了变形过程中的TRIP效应;随着退火温度的升高,0.2C-5Mn-1.5Al钢的奥氏体含量及伸长率均表现为先增加后减少的趋势,而屈服强度略微下降,拉伸强度持续增加,在760 ℃退火3 min时获得最佳的力学性能:伸长率为32%,强塑积为35 GPa·%,Al的添加有效提高了0.2C-5Mn中锰TRIP钢的综合力学性能。

关键词: 中锰TRIP钢, 退火工艺, 相变规律, 组织性能, 奥氏体含量

Abstract: The equilibrium phase diagram, microstructure and mechanical properties of 0.2C-5Mn-1.5Al medium manganese TRIP steel under different annealing processes was studied by means of calculation of phase diagram (CALPHAD) method, scanning electron microscopy (SEM), X-ray diffractometry (XRD), and tensile test. The influence of Al on equilibrium phase diagram, intercritcal annealing process, and mechanical properties are also studied. The results show that Al addition expands the intercritical region and shift the region to higher temperatures. The intercritical annealing temperature is increased, the austenite reverse transformation process is accelerated, the annealing time is shortened, the aggregation of C and Mn elements is promoted. The retained austenite content is effectively improved, and the deformation process TRIP effect is enhanced. With the increase of annealing temperature, the austenite content and elongation of 0.2C-5Mn-1.5Al steel show a trend of increasing first and then decreasing, while the yield strength decrease slightly, tensile strength continue to increase. And annealing at 760 ℃ for 3 min, the best mechanical properties are obtained, the elongation is 32%, and the strong plastic product is 35 GPa·%, which show that the addition of Al element effectively increases the comprehensive mechanical properties of manganese TRIP in 0.2C-5Mn.

Key words: medium manganese TRIP steel, annealing process, phase transformation law, microstructure and mechanical properties, austenite content

中图分类号:

TG142.1

王润勋, 王宝峰, 李岩, 定巍, 潘红波. 0.2C-5Mn-1.5Al中锰TRIP钢的显微组织及力学性能[J]. 金属热处理, 2020, 45(4): 63-68.

Wang Runxun, Wang Baofeng, Li Yan, Ding Wei, Pan Hongbo. Microstructure and mechanical properties of 0.2C-5Mn-1.5Al medium manganese TRIP steel[J]. Heat Treatment of Metals, 2020, 45(4): 63-68.

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0.2C-5Mn-1.5Al中锰TRIP钢的显微组织及力学性能

Microstructure and mechanical properties of 0.2C-5Mn-1.5Al medium manganese TRIP steel

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