Effect of Solution Nitriding on Microstructure and Hardness in 12%Cr Martensitic Stainless Steels

被引：1

作者：

Ngo, Huynh Kinh Luan ^{[1
]}

Nakashima, Koichi ^{[1
]}

Tsuchiyama, Toshihiro ^{[2
]}

Takaki, Setsuo ^{[2
]}

机构：

[1] Kyushu Univ, Grad Sch Engn, Nishi Ku, Fukuoka 8190395, Japan

[2] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan

来源：

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN | 2012年 / 98卷 / 01期

关键词：

solution nitriding; martensitic stainless steel; high nitrogen steel; secondary hardening; chromium nitride; chromium carbide; CORROSION-RESISTANCE; NITROGEN; CARBON;

D O I：

10.2355/tetsutohagane.98.25

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Synopsis : Solution nitriding was applied to conventional 12%Cr stainless steels such as JIS SUS4 10L, SUS410, SUS420J1 and SUS420J2, and then the microstructure and hardness were examined for the as-quenched specimens as well as tempered ones. Nitrogen concentration was increased to around 0.28 mass% under the solution nitriding condition of 1473K-0.1MPa N-2 in all of the 12%Cr steels regardless of the carbon content. Solid solution strengthening by nitrogen was relatively small compared with that by carbon in as-quenched martensite. However, solution-nitrided steels exhibited a remarkably large secondary hardening during tempering, which hardly appears in conventional martensitic stainless steels without nitrogen. TEM observation and X-ray analysis for extracted residue indicated that the secondary hardening by nitrogen was caused by precipitation of fine CrN nitride.

引用

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页码：A25 / A31

页数：7

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