W-Mo 系焼結高速度鋼の材料特性に及ぼす窒素および炭素当量の影響

概要

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Four grades of JIS SKH 51 high speed steel having 0.9% and 1.3% carbon equivalent with and without carbon replacement by 0.5% nitrogen were produced by using gas atomized powders and HIP processing. The influence of nitrogen on properties of SKH 51 was investigated. The following results were obtained in this study. (1) Incipient melting temperature is dependent only upon carbon content, but not upon nitrogen content. (2) The curves of quench hardness versus austenitizing temperature have shifted to higher temperature significantly by the replacement of carbon by nitrogen. (3) The amount of retained austenite is closely related to carbon equivalent, but this value is slightly lower at the same carbon equivalent in the nitrogen-containing steels. From the results of chemical analysis of extracted residues (precipitates), EPMA and EDX analyses of MC and M_6C, it is deduced that the above mentioned behavior is caused by the change in the concentration of constituent in the matrices and by the stabilization of precipitates resulted from the redistribution of alloying elements in MC and matrices.
社団法人日本鉄鋼協会の論文
1986-10-01