新型高氮马氏体耐热铸钢的热处理及相变解析

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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

Published: 05 June 2022 Online: 2022-06-08

CLC number:

TB35

Fund:National Natural Science Foundation of China (51771137).

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	Articles by authors
	SHI Tianyu
	KONG Weixiong
	CHEN Yulin
	NING Baoqun
	DONG Zhizhong

Cite this article:

SHI Tianyu,KONG Weixiong,CHEN Yulin, et al. Investigation on Heat Treatment and Phase Transformation for a New High Nitrogen Martensitic Heat-resistant Cast Steel[J]. Materials Reports, 2022, 36(Z1): 20120084-6.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2022/V36/IZ1/20120084

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