Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Effects of W on Mechanical Properties and Microstructure of a Highstrength 9% Cr Heat Resisting Steel
Kou-you RYUUToshio FUJITA
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1987 Volume 73 Issue 8 Pages 1034-1040

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Abstract

The change of mechanical properties and microstructure has been investigated by substituting W for a part of Mo in a 9% chromium heat-resisting steel.
Substituting W for a part of Mo has little effect on tensile and impact properties at room temperature as well as creep rupture strength at under 600°C, but shows benefitial effects on long-term creep rupture strength at above 650°C. This is related to the fact that the substitution reduces the coarsening tendecy of precipitates and inhibits the formation of M6C which is considered detrimental to elevated temperature strength.

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© The Iron and Steel Institute of Japan
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