中炭素 Ni-Cr-Mo 鋼の静的引張性質におよぼす残留オーステナイトの残留形態の影響

概要

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A study has been made of the effects of the shape and distribution of retained austenite on static tensile properties of two Ni-Cr-Mo steels containing 0.4 and 0.6 per cent carbon, respectively. It was found that retained austenite, when it appeared accicularly, or lenticularly along martensite lath or plate boundaries, improved ductility without dropping yield strength excessively in the steel containing 0.4 per cent carbon and both strength and ductility moderately in the steel containing 0.6 per cent carbon. When austenite retained massively along prior austenite grain boundaries as well as acicularly or lenticularly along martensite lath or plate boundaries, were found detrimental effects on both yield strength and ductility in the steel containing 0.4 per cent carbon, but both the strength and ductility were improved excessively in the steel containing 0.6 per cent carbon. From these results, it may be suggested that retained austenite appearing massively, in ductile martensite, along prior austenite grain boundaries has detrimental effects for ductility due to the formation of microvoids between it and martensite in the process of plastic deformation.
社団法人日本鉄鋼協会の論文
1976-05-01