低炭素低合金鋼のベイナイト変態における超塑性挙動

概要

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Transformation plasticity related to the bainitic transformation during continuous cooling with applied stress up to 190MPa in a low carbon HSLA steel was studied. The effect of superplastic deformation on microstructure and tensile properties was also examined. The obtained results are as follows : (1) B_s and bainite trasformation range were shifted to a higher temperature with increasing of applied stress above about 60MPa. (2) Bainitic structure consisted of lath-like bainitic ferrite and granular bainitic ferrite. An increase of applied stress decreased the former and the structure at 190MPa of applied stress was almost granular. (3) For stresses above about 50MPa superplastic strain was greater than linear function of applied stress. (4) Superplastic deforming in the bainite transformation did not change the tensile properties in tests at room temperature and -196℃.
社団法人日本鉄鋼協会の論文
1993-12-01