含铝中锰钢的淬火配分处理

doi:10.13251/j.issn.0254-6051.2025.05.034

摘要/Abstract

摘要： 对新设计的Fe-9Mn-2Al-0.3C中锰钢进行不同参数的淬火配分处理,研究了加热温度(640~860 ℃)、淬火介质温度(60~140 ℃)和淬火时间(10~300 s)对中锰钢组织和性能的影响,并与淬火回火(QT)工艺处理试验钢的组织性能进行对比分析。结果表明:试验钢采取完全奥氏体化Q&P工艺处理,可获得板条状马氏体和块状残留奥氏体的两相组织,且860 ℃×300 s保温+60 ℃×300 s淬火+350 ℃×180 s配分处理后,可获得最佳强塑性,抗拉强度为1408.3 MPa,断后伸长率为15.2%,强塑积可达21.4 GPa·%。淬火介质温度对试验钢组织形貌、晶粒尺寸影响较小,主要影响残留奥氏体的含量。淬火时间对试验钢的组织结构基本没有影响,但更长的保温时间有利于碳元素的扩散,使残留奥氏体富碳而稳定,进而提高试验钢的塑性。通过对比Q&P工艺与QT工艺,发现Q&P工艺在淬火与配分阶段,碳元素能够更有效地扩散到奥氏体中,使残留奥氏体更加稳定。Q&P工艺处理后的试验钢残留奥氏体含量更高,具有更好的塑性。

关键词: 含铝中锰钢, 淬火配分工艺, 显微组织, 力学性能

Abstract: A newly designed Fe-9Mn-2Al-0.3C medium Mn steel was subjected to quenching and partitioning (Q&P) treatment with different parameters. The effects of heating temperature (640-860 ℃), quenching medium temperature (60-140 ℃), and quenching time (10-300 s) on the microstructure and properties of the medium Mn steel were studied, and compared and analyzed with the microstructure and properties of the steel treated by quenching and tempering (QT) process. The results show that the microstructure of the steel is lath martensite and block remained austenite treated by fully austenitizing Q&P process, and the best strength and plasticity can be obtained, with a tensile strength of 1408.3 MPa, elongation after fracture of 15.2%, and product of strength and elongation of 21.4 GPa·%, after 860 ℃×300 s heating +60 ℃×300 s quenching+350 ℃×180 s partitioning. The quenching medium temperature has a little effect on the microstructure and grain size of the tested steel, mainly affecting the content of retained austenite. The quenching time has little effect on the microstructure of the tested steel, but a longer quenching time is beneficial for the diffusion of carbon element, making the retained austenite rich in carbon and stable, thereby improving the plasticity of the tested steel. By comparing the Q&P process with the QT process, it is found that carbon elements can diffuse into austenite more effectively during the Q&P stages, making retained austenite more stable. The steel treated by Q&P process has higher retained austenite content and better plasticity.

Key words: Al-containing medium Mn steel, quenching and partitioning (Q&P), microstructure, mechanical properties

中图分类号:

TG142.1

杨大伟, 邵洙浩, 谷国君, 唐林, 李金栋, 马星宇. 含铝中锰钢的淬火配分处理[J]. 金属热处理, 2025, 50(5): 220-227.

Yang Dawei, Shao Zhuhao, Gu Guojun, Tang Lin, Li Jindong, Ma Xingyu. Q&P process of Al-containing medium Mn steel[J]. Heat Treatment of Metals, 2025, 50(5): 220-227.

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