热等静压成形FeCrAl不锈钢的组织及脆性分析

doi:10.13251/j.issn.0254-6051.2021.05.002

金属热处理 ›› 2021, Vol. 46 ›› Issue (5): 9-13.DOI: 10.13251/j.issn.0254-6051.2021.05.002

热等静压成形FeCrAl不锈钢的组织及脆性分析

保顺^1,2, 刘荣佩¹, 丰涵², 佴启亮³, 贾建⁴, 朱玉亮², 宋志刚²

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所, 北京 100081;
3.浙江久立特材科技股份有限公司特材研究院, 浙江湖州 313028;
4.钢铁研究总院高温材料研究所, 北京 100081

收稿日期:2020-10-16 出版日期:2021-05-25 发布日期:2021-07-21
通讯作者: 丰涵,高级工程师,博士,E-mail:fenghan@nercast.com
作者简介:保顺(1994—),男,硕士研究生,主要研究方向为双相不锈钢,E-mail:1169222383@qq.com。

Microstructure and brittleness analysis of FeCrAl stainless steel by hot isostatic pressing

Bao Shun^1,2, Liu Rongpei¹, Feng Han², Nai Qiliang³, Jia Jian⁴, Zhu Yuliang², Song Zhigang²

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Special Materials Research Institute, Zhejiang JIULI Hi-Tech Metals Co., Ltd., Huzhou Zhejiang 313028, China;
4. Institute for High-Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2020-10-16 Online:2021-05-25 Published:2021-07-21

摘要/Abstract

摘要： 采用Thermo-Calc软件对两种铝含量的FeCrAl不锈钢母合金的近平衡态相构成进行了计算分析,采用光学显微镜、扫描电镜、能谱分析等方法对经雾化制粉和热等静压成形(HIP)制备的FeCrAl不锈钢的组织及力学性能进行了观察和研究。结果表明:试验钢基体相为BCC结构的α相,主要析出相MC碳化物的析出峰值温度约为700 ℃,其极限析出量(质量分数)约0.8%,主要沿铁素体α基体的晶界处呈链状分布析出,并易在三叉晶界等高能量区域粗化长大。滑移系少、质硬的六方结构MC碳化物析出是导致热等静压FeCrAl不锈钢室温冲击脆断的主要原因。800 ℃退火处理后水冷可以减少MC碳化物析出,改善HIP成形FeCrAl不锈钢的冲击性能。

关键词: FeCrAl不锈钢, 碳化物, 热等静压, 脆性断裂

Abstract: The equilibrium phase composition of the two FeCrAl stainless steel parent alloys with different aluminum content was calculated and analyzed by using Thermo-calc software. The microstructure and mechanical properties of the FeCrAl stainless steel prepared by powder atomization and hot isostatic pressing(HIP) were observed and studied by means of optical microscope, SEM and EDS. The results show that the matrix phase of the tested steel is α phase with BCC structure, and the peak precipitation temperature of MC carbide is about 700 ℃, and its ultimate precipitation amount(mass fraction) is about 0.8%. It is mainly distributed along the grain boundary of the ferrite matrix in a chain pattern, and easy to cohere in the triple line boundary and other high-energy regions. The MC carbide precipitation of the hexagonal structure with fewer slip systems and hard texture is the main reason for impacting brittle fracture of HIP FeCrAl stainless steel at room temperature. After annealing at 800 ℃ and water cooling, the MC carbide precipitation of HIP FeCrAl stainless steel can be reduced and the impact property of it can be improved.

Key words: FeCrAl stainless steel, carbide, hot isostatic pressing(HIP), brittle fracture

中图分类号:

TG141

保顺, 刘荣佩, 丰涵, 佴启亮, 贾建, 朱玉亮, 宋志刚. 热等静压成形FeCrAl不锈钢的组织及脆性分析[J]. 金属热处理, 2021, 46(5): 9-13.

Bao Shun, Liu Rongpei, Feng Han, Nai Qiliang, Jia Jian, Zhu Yuliang, Song Zhigang. Microstructure and brittleness analysis of FeCrAl stainless steel by hot isostatic pressing[J]. Heat Treatment of Metals, 2021, 46(5): 9-13.

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热等静压成形FeCrAl不锈钢的组织及脆性分析

Microstructure and brittleness analysis of FeCrAl stainless steel by hot isostatic pressing

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