低合金鋼に生成する島状マルテンサイトの組成および体積分率に及ぼす熱処理条件の影響

概要

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Effects of reheating temperature, corresponding to austenite single phase or ferrite-austenite two-phase region, on chemical and quantitative changes in Martensite and Austenite (M-A) constituents in a low alloy steel were examined. Reheating to austenite single phase results in bainite microstructure containing M-A constituents. Enrichment of carbon in the M-A constituents is observed. Any substantial difference in Mn content between the M-A constituents and surroundings is not observed. T_0 temperature of the steel which chemistry is equal to the M-A constituents is close to the bainite transformation finishing temperature. When the steel is reheated in the two-phase region, M-A constituents are observed in ferrite and reveal higher carbon and Mn contents than the ferrite. Carbon content of the M-A constituents decreases and Mn content increases with increasing holding time of reheating at the two-phase region. The M-A constituents observed in the materials reheated to austenite single phase region show higher carbon content than those in the steel reheated to ferrite and austenite two phase region.
社団法人日本鉄鋼協会の論文
1998-04-01