鋼の焼入冷却途中で加えた引張り及び圧縮応力が残留オーステナイト量に及ぼす影響

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タイトル別名
  • Effects of Applied Tensile Stress and Compressive Stress in Cooling of Steels on the Amount of Retained Austenite
  • コウ ノ ヤキイレ レイキャク トチュウ デ クワエタ ヒッパリ オヨビ アッシュク オウリョク ガ ザンリュウ オーステナイトリョウ ニ オヨボス エイキョウ

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抄録

The amount of retained austenite (γR) in high-carbon alloy steels (0.99%C-2.86%Cr and 1.00%C-4.99%Ni) under application of stresses (tension, compression and bending) while the steels are cooling has been studied as a function of the kind of stress and the temperature of loading. The principal results may be summarized as follows. (1) When the steels are transformed under application of stress, the amount of γR was increased by tensile stress and decreased by compressive stress. These findings are quite contrary to the expectation of the accepted opinion that the martensite transformation is promoted by shear stress and normal tensile stress but is inhibited by normal compressive stress. (2) It was observed that the steels which were loaded at the range only above Ms temperature indicated the same effect as in (1) above i.e. γR was increased by tension and decreased by compression. This is contradictory to the opinion that work hardening causes mechanical stabilization of austenite, for if we follow this opinion γR must be increased by compressive stress, as much as by tensile stress. (3) At the range below Tc temperature at which the effect of stress begins, the amount of γR was decided by the width of the temperature range in which the load was applied, i.e. a temporary application of stress or deformation has little effect on γR. Therefore it seems that the grade of stabilization of austenite in the present work is little affected by deformation but mainly by the stress itself during cooling. (4) Tc temperature of compressive stress was higher about 50∼100°C more than Tc of tensile stress. In medium carbon alloy steel (0.58%C-4.02%Ni), the amount of γR was not changed by the tensile stress but decreased clearly by the compressive stress.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 23 (12), 735-739, 1959

    公益社団法人 日本金属学会

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