新型高氮马氏体耐热铸钢的热处理及相变解析

材料导报

2022, Vol. 36

Issue (Z1): 20120084-6

金属与金属基复合材料

新型高氮马氏体耐热铸钢的热处理及相变解析

史天宇, 孔维雄, 陈雨琳, 宁保群, 董治中

天津理工大学材料科学与工程学院,天津 300384

Investigation on Heat Treatment and Phase Transformation for a New High Nitrogen Martensitic Heat-resistant Cast Steel

SHI Tianyu, KONG Weixiong, CHEN Yulin, NING Baoqun, DONG Zhizhong

School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China

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摘要 9~12Cr马氏体耐热钢在长期高温高压服役中的蠕变强度随M₂₃C₆等析出相粗化急剧下降,限制了其在超超临界发电领域的应用。近期研究表明,MN型强化相较M₂₃C₆具有更高的结构稳定性和热稳定性。受此启发,本工作在9Cr耐热钢的基础上设计和制备了以氮化物析出强化为主的一种新型高氮(0.27%,质量分数)马氏体耐热钢。本工作结合热平衡模拟、差热分析以及组织观察,制定了均质化(1 000 ℃-10 h)、正火(1 030 ℃-2 h)和回火(760 ℃-2 h)的热处理工艺,并借助透射电镜对其回火组织进行析出相解析。结果表明热处理后最终组织为回火板条马氏体与少量δ-铁素体的混合组织,其中马氏体板条平均宽度约220 nm,板条界分布有几百纳米的Laves相,板条内分布有大量小尺寸的氮化物析出相(MN型、M₂N型和M₆N型)。高氮马氏体耐热钢在650 ℃时抗拉强度为(386±22) MPa,屈服强度为(263.67±15) MPa,延伸率为(36.22±2)%。

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关键词: 高氮马氏体耐热钢热处理微观组织超超临界

Abstract: In ultra-supercritical (USC) power plants, the application of high chromium martensitic heat-resistant steel is commonly limited by the creep strength which decreases seriously when the steel undergoes long-term service at high temperature with the coarsening of precipitates,such as M₂₃C₆. In recent studies, MN precipitate exhibits higher stability than M₂₃C₆ during elevated temperature service. In this work, a newly-deve-loped high nitrogen (0.27%, mass fraction) martensitic heat-resistant steel was designed and prepared based on 9Cr heat resistant steel, aiming at improving its high temperature performance by precipitation strengthening of nitrides. Optimized heat treatment for high nitrogen martensitic heat-resistant steel was established as homogenization (1 000 ℃-10 h), normalization (1 030 ℃-2 h), and tempering (760 ℃-2 h), referring to thermal equilibrium simulation, differential thermal analysis, and microstructure characterization. The high nitrogen martensitic heat-resistant steel with the heat treatment mentioned above possess the tensile strength of (386±22) MPa, the yield strength of (263.67±15) MPa, and the elongation of (36.22±2)% at 650 ℃. Optical microscopy and transmission electron microscopy results indicate that the final microstructure of the high nitrogen martensitic heat-resistant steel is composed of tempered lath-martensite with the average width of about 220 nm and a few δ-ferrite. Specially, Laves phase with the size of hundreds of nanometers was distributed in boundaries of lath-martensite, and massive nitrides (MN-type, M₂N-type and M₆N-type) with different sizes were precipitated in lath-martensite.

Key words: high nitrogen martensitic heat-resistant steel heat treatment microstructure ultra-supercritical

出版日期: 2022-06-05 发布日期: 2022-06-08

ZTFLH:

TB35

基金资助: 国家自然科学基金(51771137)

通讯作者: zhizhong.dong@email.tjut.edu.cn

作者简介: 史天宇,2019年9月至2022年3月就读于天津理工大学材料科学与工程学院,硕士学位。主要从事高氮马氏体耐热钢的研究。
董治中,天津理工大学材料科学与工程学院教授,天津市特聘专家。本科、硕士、博士毕业于天津大学,2001年获材料物理与化学专业博士学位。2002年获得日本学术振兴会博士后奖学金,2002—2005年在日本国家材料所从事博士后研究;2005—2008年受邀赴瑞士联邦材料研究所做EMPA项目主管。主要从事超超临界耐热发电材料、海洋工程结构材料、记忆合金材料及相变机理研究。在Acta Materialia等国内外期刊发表文章50多篇,以第一发明人的身份获得欧洲专利一项、中国发明专利5项。

引用本文:

史天宇, 孔维雄, 陈雨琳, 宁保群, 董治中. 新型高氮马氏体耐热铸钢的热处理及相变解析[J]. 材料导报, 2022, 36(Z1): 20120084-6.
SHI Tianyu, KONG Weixiong, CHEN Yulin, NING Baoqun, DONG Zhizhong. Investigation on Heat Treatment and Phase Transformation for a New High Nitrogen Martensitic Heat-resistant Cast Steel. Materials Reports, 2022, 36(Z1): 20120084-6.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2022/V36/IZ1/20120084

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