部分奥氏体逆转变工艺对Fe-8Mn-0.2C-3Al中锰钢组织性能的影响

doi:10.13251/j.issn.0254-6051.2025.02.014

金属热处理 ›› 2025, Vol. 50 ›› Issue (2): 90-95.DOI: 10.13251/j.issn.0254-6051.2025.02.014

部分奥氏体逆转变工艺对Fe-8Mn-0.2C-3Al中锰钢组织性能的影响

刘明珠¹, 丁桦^1,2, 邹宇明¹

1.东北大学材料科学与工程学院, 辽宁沈阳 110004;
2.东北大学辽宁省轻量化用关键金属材料重点实验室, 辽宁沈阳 110004

收稿日期:2024-07-26 修回日期:2024-10-31 发布日期:2025-04-10
通讯作者: 丁桦,教授,博士生导师,E-mail:dingh@smm.neu.edu.cn
作者简介:刘明珠(2000—),女,硕士研究生,主要研究方向为中锰钢组织与性能,E-mail:liumingzhu2000@126.com。

Effect of partial austenite reverse transformation process on microstructure and mechanical properties of Fe-8Mn-0.2C-3Al medium Mn steel

Liu Mingzhu¹, Ding Hua^1,2, Zou Yuming¹

1. School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110004, China;
2. Key Laboratory of Lightweight Structural Materials of Liaoning Province, Northeastern University, Shenyang Liaoning 110004, China

Received:2024-07-26 Revised:2024-10-31 Published:2025-04-10

摘要/Abstract

摘要： 对Fe-8Mn-0.2C-3Al中锰钢采用两步退火的部分奥氏体逆转变(PART)工艺,通过场发射扫描电镜、X射线衍射仪、万能试验机等对试验钢的微观组织和力学性能进行研究。结果表明,随着第一步退火温度的提高,PART工艺处理试验钢的奥氏体含量由49.7%逐渐下降至21.6%,组织呈板条状,屈服强度逐渐升高,抗拉强度和伸长率逐渐下降。755 ℃×15 min+620 ℃×30 min处理试验钢获得优秀力学性能,抗拉强度1087 MPa,伸长率43.4%,强塑积47.2 GPa·%,这是由于适中的奥氏体稳定性可以在拉伸过程中充分发挥TRIP效应,提高材料的综合力学性能。

关键词: Fe-8Mn-0.2C-3Al中锰钢, 部分奥氏体逆转变, 奥氏体稳定性, TRIP效应, 力学性能

Abstract: Microstructure and mechanical properties of Fe-8Mn-0.2C-3Al medium Mn steel treated by partial austenite reverse transformation (PART) process with two-step annealing were studied by means of field emission scanning electron microscope, X-ray diffractometer and universal testing machine. The results show that for the tested steel treated by PART process with the increase of first step annealing temperature, the austenite content gradually decreases from 49.7% to 21.6%, and the microstructure is lath-like, the yield strength gradually increases, while the tensile strength and elongation gradually decrease. After treated at 755 ℃ for 15 min and 620 ℃ for 30 min, the tested steel obtains optimal mechanical properties, with the tensile strength of 1087 MPa, elongation of 43.4%, and the product of strength and elongation of 47.2 GPa·%, which is attributed to that the moderate austenite stability can fully utilize the TRIP effect during the tensile process and improve the comprehensive mechanical properties of the steel.

Key words: Fe-8Mn-0.2C-3Al medium Mn steel, partial austenite reverse transformation, austenite stability, TRIP effect, mechanical properties

中图分类号:

TG142.1

刘明珠, 丁桦, 邹宇明. 部分奥氏体逆转变工艺对Fe-8Mn-0.2C-3Al中锰钢组织性能的影响[J]. 金属热处理, 2025, 50(2): 90-95.

Liu Mingzhu, Ding Hua, Zou Yuming. Effect of partial austenite reverse transformation process on microstructure and mechanical properties of Fe-8Mn-0.2C-3Al medium Mn steel[J]. Heat Treatment of Metals, 2025, 50(2): 90-95.

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部分奥氏体逆转变工艺对Fe-8Mn-0.2C-3Al中锰钢组织性能的影响

Effect of partial austenite reverse transformation process on microstructure and mechanical properties of Fe-8Mn-0.2C-3Al medium Mn steel

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