焼結合金鋼における均質および不均質組織と機械的性質との関係

概要

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High performance sintered 4600 steels were obtained by Metal Injection Molding (MIM) process in our previous study. This seemed to be due to the fine heterogeneous structure which were consisted of bainite, martensite and retained austenite by the segregation of Ni added as alloying element. This study has been performed to clarify the relationship between the mechanical properties and the homogeneous and heterogeneous structures of 4600 steels using conventional powder metallurgy (P/M) process.<BR>For the wide sintered density range, the final carbon content was properly controlled by adjusting the additional carbon content and the sintering atmosphere in both prealloyed and elemental mixed powder compacts. Sintered microstructures of the prealloyed powder compacts showed the dual homogeneous structures consisted of ferrite and bainite. On the other hand, the heterogeneous structure including martensite appeared in the elemental mixed powder compacts. In the high density range over 7.3Mg/m<SUP>3</SUP> at which the pores were closed, the strength of the latter was higher than that of the former. However, the strength of the P/M steels were smaller than that of the MIM steels because of the coarse heterogenous structure.
社団法人粉体粉末冶金協会の論文
1995-10-15