Mn对低镍双相不锈钢高温力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.02.004

摘要/Abstract

摘要： 在900~1300 ℃、1 s^-1条件下进行17Cr-2Ni-2Mo-0.2N-xMn(x=2,3,4)双相不锈钢的高温拉伸试验,且在900~1300 ℃、1 s^-1条件下对其进行50%、60%、70%变形量的热压缩试验,研究Mn含量对其高温力学性能的影响。结果表明,在900 ℃变形温度下,铁素体发生动态再结晶,奥氏体则只发生部分动态再结晶;在变形温度为1200 ℃时,铁素体以动态回复为主,奥氏体发生动态再结晶。所有试样在高温变形过程中产生了不同程度的动态回复或动态再结晶,在热压缩试验后期均产生了二次硬化现象;在热压缩试验中,Mn含量从2%提高至4%时,17Cr型双相不锈钢在900~1100 ℃温度范围内动态再结晶行为先加剧后放缓,而在1200 ℃及更高的变形温度下,Mn含量对动态再结晶行为影响较小;在1150~1200 ℃下,热拉伸变形抗力随Mn含量增加呈现出先降低后增加的趋势,Mn含量为3%时,不锈钢具有最佳的热加工性能。

关键词: 经济型双相不锈钢, Mn, 热变形, 动态再结晶, 加工硬化率

Abstract: High-temperature tensile tests were conducted on 17Cr-2Ni-2Mo-0.2N-xMn (x=2, 3, 4) duplex stainless steel at 900-1300 ℃ and 1 s^-1, and thermal compression tests were conducted with 50%, 60%, and 70% deformation at 900-1300 ℃ and 1 s^-1, respectively, to investigate the effect of Mn content on its high-temperature mechanical properties. The results indicate that at a deformation temperature of 900 ℃, ferrite undergoes dynamic recrystallization, while austenite only undergoes partial dynamic recrystallization. At a deformation temperature of 1200 ℃, ferrite mainly undergoes dynamic recovery, while austenite undergoes dynamic recrystallization. All specimens exhibit varying degrees of dynamic recovery or dynamic recrystallization during high-temperature deformation, with secondary hardening occurring in the final stage of the thermal compression test. In the thermal compression test, when the Mn content increases from 2% to 4%, the dynamic recrystallization behavior of 17Cr duplex stainless steel first intensifies and then slows down in the temperature range of 900-1100 ℃. However, at deformation temperatures of 1200 ℃ and higher, the effect of Mn content on the dynamic recrystallization behavior is relatively small. At the temperature range of 1150-1200 ℃, the thermal tensile deformation resistance decreases initially and then increases with the rise of manganese content, with 3% manganese providing the best hot working performance.

Key words: lean duplex stainless steel, Mn, thermal deformation, dynamic recrystallization, strain hardening rate

中图分类号:

TG142.71

杨宇恒, 何建国, 宋志刚, 丰涵, 吕杰晟, 吴晓涵, 顾洋, 朱玉亮. Mn对低镍双相不锈钢高温力学性能的影响[J]. 金属热处理, 2025, 50(2): 23-28.

Yang Yuheng, He Jianguo, Song Zhigang, Feng Han, Lü Jiesheng, Wu Xiaohan, Gu Yang, Zhu Yuliang. Influence of Mn on high-temperature mechanical properties of low Ni duplex stainless steel[J]. Heat Treatment of Metals, 2025, 50(2): 23-28.

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