Nb对00Cr21Ni6Mn9N不锈钢显微组织和晶间腐蚀敏感性的影响

doi:10.13251/j.issn.0254-6051.2022.09.041

金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 240-244.DOI: 10.13251/j.issn.0254-6051.2022.09.041

Nb对00Cr21Ni6Mn9N不锈钢显微组织和晶间腐蚀敏感性的影响

闫治坤^1,2, 陈海涛², 郎宇平², 屈华鹏², 冯翰秋², 刘荣佩¹

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院特殊钢研究院, 北京 100081

收稿日期:2022-04-28 修回日期:2022-07-15 发布日期:2022-10-18
通讯作者: 刘荣佩,教授,硕士,Email:522439273@qq.com
作者简介:闫治坤(1996—),男,硕士研究生,主要研究方向为不锈钢及耐蚀合金,E-mail:1986917421@qq.com。

Effect of Nb on microstructure and intergranular corrosion sensitivity of 00Cr21Ni6Mn9N stainless steel

Yan Zhikun^1,2, Chen Haitao², Lang Yuping², Qu Huapeng², Feng Hanqiu², Liu Rongpei¹

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Institute for Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2022-04-28 Revised:2022-07-15 Published:2022-10-18

摘要/Abstract

摘要： 为了研究Nb对00Cr21Ni6Mn9N不锈钢固溶后显微组织和耐晶间腐蚀性能的影响,分别在950、1000、1050、1100、1150和1200 ℃对含Nb量(质量分数,下同)为0.057%和不含Nb的00Cr21Ni6Mn9N不锈钢进行1 h固溶处理,并观察其微观组织。结果表明,固溶温度在950~1200 ℃时,00Cr21Ni6Mn9N不锈钢的晶粒尺寸随着固溶温度的升高而增大,Nb的加入促进00Cr21Ni6Mn9N不锈钢中混晶组织的出现,提高其完全再结晶温度。不含Nb的试验钢在1000 ℃以上固溶后即可获得晶粒大小均匀的组织,而含0.057%Nb的试验钢则需要在1100 ℃以上才可以获得均匀组织,且其尺寸略大于无Nb钢在1000 ℃时完全再结晶的晶粒。随着固溶温度的升高和晶粒尺寸的长大,析出的Z相含量降低,晶粒界面能减小,在1150 ℃和1200 ℃固溶1 h后,Nb对晶粒的细化作用和温度升高造成的晶粒长大程度变得不再明显。两种成分的钢均具有较低的晶间腐蚀敏感性,含Nb量为0.057%的00Cr21Ni6Mn9N不锈钢其再活化率R_a值较不含Nb的钢进一步降低。

关键词: 00Cr21Ni6Mn9N不锈钢, Nb微合金化, 固溶处理, 晶间腐蚀

Abstract: In order to study the effect of Nb on microstructure and intergranular corrosion resistance of 00Cr21Ni6Mn9N stainless steel after solution treatment, the 00Cr21Ni6Mn9N stainless steel with 0.057%Nb and without Nb were solution treated at 950, 1000, 1050, 1100, 1150 and 1200 ℃ for 1 h, respectively, and the microstructure was observed. The results show that when the solution temperature is 950-1200 ℃, the grain size of the 00Cr21Ni6Mn9N stainless steel increases with the increase of the solution temperature. The addition of Nb promotes the appearance of mixed crystal structure in the 00Cr21Ni6Mn9N stainless steel and increases its complete recrystallization temperature. The tested steel without Nb can obtain a uniform grain size after solid solution above 1000 ℃, while the tested steel with 0.057%Nb needs to be above 1100 ℃ to obtain a uniform structure, and its size is slightly larger than that of the steel without Nb at 1000 ℃ completely recrystallized grain. With the increase of solution temperature and the growth of grain size, the content of the precipitated Z phase decreases, and the grain interface energy decreases. After solution treatment at 1150 ℃ and 1200 ℃ for 1 h, the grain refinement effect of Nb and the degree of grain growth caused by the increase of temperature become no longer obvious. Both steels have lower intergranular corrosion susceptibility, while the reactivation rate R_a of the 00Cr21Ni6Mn9N stainless steel with 0.057%Nb is further lower than that of the steel without Nb.

Key words: 00Cr21Ni6Mn9N stainless steel, Nb microalloying, solution treatment, intergranular corrosion

中图分类号:

TG142.1⁺3

闫治坤, 陈海涛, 郎宇平, 屈华鹏, 冯翰秋, 刘荣佩. Nb对00Cr21Ni6Mn9N不锈钢显微组织和晶间腐蚀敏感性的影响[J]. 金属热处理, 2022, 47(9): 240-244.

Yan Zhikun, Chen Haitao, Lang Yuping, Qu Huapeng, Feng Hanqiu, Liu Rongpei. Effect of Nb on microstructure and intergranular corrosion sensitivity of 00Cr21Ni6Mn9N stainless steel[J]. Heat Treatment of Metals, 2022, 47(9): 240-244.

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Nb对00Cr21Ni6Mn9N不锈钢显微组织和晶间腐蚀敏感性的影响

Effect of Nb on microstructure and intergranular corrosion sensitivity of 00Cr21Ni6Mn9N stainless steel

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