ベイナイト型高強度鍛造用鋼の成分設計
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概要
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Effects of alloying elements on microstructure and mechanical properties in conventional microalloyed bainite forging steels were examined. Regression equations of carbon equivalent C_<eq> and B_s temperature for reheated and continuously cooled bainite steel were obtained. Coefficients of C_<eq> equation and B_s equation were well correlated. When steel were strengthened to the same extent by alloying elements, microstructures became fine especially by alloying of Cr, Mn, and Mo. Tempering at 473K improved the impact value. It is assumed that tempering at 473K promoted precipitation of supersaturated carbon in bainitic ferrite. Tempering at 573K decreased retained austenite and improved the 0.2% proof stress.
- 社団法人日本鉄鋼協会の論文