Mn18Cr18N奥氏体不锈钢平衡凝固过程中的相变与析出行为

doi:10.13251/j.issn.0254-6051.2020.03.016

金属热处理 ›› 2020, Vol. 45 ›› Issue (3): 78-85.DOI: 10.13251/j.issn.0254-6051.2020.03.016

Mn18Cr18N奥氏体不锈钢平衡凝固过程中的相变与析出行为

王英虎^1,2

1. 攀钢集团研究院有限公司, 四川攀枝花 617000;
2. 海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009

收稿日期:2019-09-21 出版日期:2020-03-25 发布日期:2020-04-03
作者简介:王英虎(1992—),男,硕士,主要研究方向为先进金属材料及加工技术,E-mail:hihihowareyou@163.com。

Phase transformation and precipitation behaviors of Mn18Cr18N austenitic stainless steel during equilibrium solidification

Wang Yinghu^1,2

1. Pangang Group Research Institute Co., Ltd., Panzhihua Sichuan 617000, China;
2. State Key Laboratory of Marine Equipment Made of Metal Material and Application, Anshan Liaoning 114009, China

Received:2019-09-21 Online:2020-03-25 Published:2020-04-03

摘要/Abstract

摘要：

借助Thermo-calc软件对Mn18Cr18N奥氏体不锈钢所属的Fe-(16~19)Cr-(16~19)Mn-(0.4~0.7)N-(0.04~0.1)C-(0.1~0.4)Si-(0.1~0.4)Ni多元体系在凝固过程中的相变及析出行为进行了研究。采用Thermo-calc中TCFE9数据库对该体系的垂直截面图进行计算,分析了不同组元对凝固和冷却过程中相变的影响,并得到了Mn18Cr18N奥氏体不锈钢的平衡凝固相变路径图。结果表明:C、N、Si和Ni含量的提高可扩大γ奥氏体区,Cr和Mn具有稳定铁素体作用。平衡凝固相变路径与M₂₃C₆相析出温度主要取决于C含量;Cr₂N相析出温度主要取决于N含量;σ相析出温度主要受Cr含量影响。

关键词: Mn18Cr18N奥氏体不锈钢, 相图计算, 凝固模式, Thermo-calc软件

Abstract:

The phase transformation and precipitation behaviors were investigated by using Thermo-calc software in the Fe-(16-19)Cr-(16-19)Mn-(0.4-0.7)N-(0.04-0.1)C-(0.1-0.4)Si-(0.1-0.4)Ni multi-element system relevant to Mn18Cr18N austenitic stainless steel during solidification. The vertical sections of phase diagram of this system were calculated by using the TCFE9 database. Based on these vertical sections, the influence of different elements was analyzed in the phase transformations during solidification and a diagram of the phase-transformation path of Mn18Cr18N austenitic stainless steel was obtained during equilibrium solidification. The test results show that increasing C, N, Si and Ni content can enlarge the stable region of γ phase and the effect of Cr and Mn on stabilizing ferrite is obvious. Phase-transformation path and M₂₃C₆ precipitation temperature mainly depend on C content; Cr₂N precipitation temperature mainly depends on N content and σ precipitation temperature mainly depends on Cr content.

Key words: Mn18Cr18N austenitic stainless steel, phase diagram calculation, solidification mode, Thermo-calc software

中图分类号:

TG142.71

王英虎. Mn18Cr18N奥氏体不锈钢平衡凝固过程中的相变与析出行为[J]. 金属热处理, 2020, 45(3): 78-85.

Wang Yinghu. Phase transformation and precipitation behaviors of Mn18Cr18N austenitic stainless steel during equilibrium solidification[J]. HTM, 2020, 45(3): 78-85.

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Mn18Cr18N奥氏体不锈钢平衡凝固过程中的相变与析出行为

Phase transformation and precipitation behaviors of Mn18Cr18N austenitic stainless steel during equilibrium solidification

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