Fe-Ni 合金におけるウィッドマンステッテン状逆変態オーステナイトと機械的性質

概要

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The effects of morphology, size and stability of reversed austenite (γ_<rev.>) on the mechanical properties have been investigated in very low C-high Ni-Steels with particular reference to the Widmanstatten-like γ_<rev.> (γ_W). The main results are summerized as follows : (1) Precipitation of γ_W caused increase of tensile strength and yield strength of steels investigated. (2) Strengthening by the precipitation of relatively stable γ_W was detrimental for the increase of ductility at low temperature, which is the characteristic of low C-Ni-Steels. (3) When the stability γ_W was relatively low, the high ductility at low temperature was obtained together with remarkable strengthening by γ_W. (4) Increase of absorbed energy together with some strengthening was observed in the steels in which small amounts of very fine γ_W precipitated. (5) The marked strengthening by the precipitation of a large amount of γ_W decreased absorbed energy. Precipitation of (γ_<LB>) along the lath boundaries did not cause remarkable increase of hardness but the decrease of absorbed energy by large amounts of γ_<LB> was smaller than that by γ_W.
社団法人日本鉄鋼協会の論文
1979-02-01