TRIP型鋼板の強度・延性に及ぼす残留オーステナイト形態の影響

概要

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Effects of nature of matrix and retained austenite such as morphology, volume fraction and carbon content on strength and ductility in (0.1〜0.3)%C-1.5%Si-1.5%Mn TRIP-aided steels were investigated. In order to change the nature of retained austenite, before heat treatment to obtain TRIP-aided steels, initial microstructure were arranged to three kinds of states, as-cold rolled martensite and ferrite-pearlite. When initial microstructure was controlled to martensite, the highest elongation was obtained and ferrite-pearlite showed the lowest value. This tendency was obvious in high carbon containing steels. The reason why TRIP-aided steels whose initial microstructure was martensite showed the highest elongation was considered to be brought about by high stability of retained austenite during deformation. This stability comes from the fact that austenite was hemmed by ferrite lath having same orientation, in addition to the small size of it.
社団法人日本鉄鋼協会の論文