恒温保持中に加えた引張りおよび圧縮応力が残留オーステナイト量におよぼす影響

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タイトル別名
  • Effects of Tensile and Compressive Stress Applied During Holding Steels Isothermally on the Amount of Retained Austenite
  • コウオン ホジ チュウ ニ 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

It is well known that when steel is hot-quenched to the temperature range of lower bainite formation and is partially transformed isothermally the residual austenite is stabilized and austenite (γR) retained at room temperature is increased. In the previous reports(1)(2)(3), however, the author indicated the existence of the effect of stress on the formation of martensite nuclei in addition to the hitherto known effect of stress on the driving force of martensite transformation, and assumed the coherent embryos of martensite formed due to Bain’s strain to explain the opposite effect of tension and compression upon the transformation. In the precent study, the author investigated how austenite is stabilized when steel is held isothermally in the temperature range of unstable austenite under the load of tension or compression. The experimental results obtained were as follows: (1) When samples of steel were held in incubation time, there was no change in the amount of γR irrespective of the holding temperature and the application of stress of positive or negative sign. Therefore this substantiated the results obtained in the previous report that “the amount of γR was dependent upon the temperature range in which the stress was applied.” (2) In the bainite temperature range the incubation time was shortened as a result of shear stress effect irrespective of its sign. At room temperature, however, tensile stress increased γR and compressive stress decreased γR (as in the case of stress effect during continuous cooling disclosed in the previous report), owing to the opposite effect of stresses, depending on whether the sign is positive or negative, and on the number of nuclei formed after holding the samples for a certain time. Thus it was confirmed here again that there was an effect of stress on the number of martensite nuclei.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (9), 557-561, 1962

    公益社団法人 日本金属学会

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