Influences of partial substitution of C by N on the microstructure and mechanical properties of 9Cr18Mo martensitic stainless steel

被引:10
作者
Wang, Rui [1 ,2 ]
Li, Fenghao [1 ,2 ]
Yu, Zhiqiang [1 ,2 ]
Kang, Yan [1 ,2 ]
Li, Meng [1 ,2 ]
Hu, Yong [3 ]
An, Haoran [1 ,2 ]
Fan, Jing [1 ,2 ]
Miao, Fang [1 ,2 ]
Zhao, Yuhong [1 ]
Eckert, Juergen [4 ,5 ]
Yan, Zhijie [1 ,2 ]
机构
[1] North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Peoples R China
[2] North Univ China, Shanxi Key Lab Adv Met Mat Special Environm, Taiyuan 030051, Peoples R China
[3] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China
[4] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
[5] Montan Univ Leoben, Chair Mat Phys, Dept Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
基金
中国国家自然科学基金;
关键词
Martensitic stainless steel; Nitrogen alloying; Carbides; Microstructure; Mechanical properties; LATH MARTENSITE; CORROSION BEHAVIOR; HEAT-TREATMENT; NITROGEN; CARBON; PRECIPITATION; BOUNDARY; CARBIDES; SILICON;
D O I
10.1016/j.matdes.2023.112497
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Large eutectic carbides presenting in the matrix deteriorate the mechanical properties of high carbon martensitic stainless steel. In the present work, nitrogen-alloyed martensitic stainless steel with different C/N ratios were designed by partial substitution of C by N of 9Cr18Mo, and their microstructure and mechanical properties were investigated. The results show that, with increasing the content of N up to 0.15 wt% in the experimental steel, the quantity and the size of eutectic carbides decrease; and the net-work eutectic carbides are gradually eliminated. The microstructure of all the steels is composed of lath martensite, twin martensite and M23C6 carbides. With partial substitution of C by N, the morphology of martensite blocks evolves from a lath shape to a blocky one, the quantity of twin martensite increases, and the nano-scaled Cr2N nitrides precipitate in the martensite matrix. The steel containing 0.15 wt% N exhibits the hardness of 60.5 HRC, a fracture strength of 1900 MPa and an elongation rate of 1.6 % due to hot rolling and heat treatment, which is attributed to the refinement of carbides and grains, solid solution of C and N, as well as the dense dislocation.
引用
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页数:13
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