鋼の焼入殘留應力に及ぼす變態及び熱収縮の影響 (II)

概要

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In succession to the previous experiments, we have studied the residual stress of quenched high Ni-Fe alloys by G. Sachs' boring method. The results are as follows : (1) When the γ→α transformation is in the higher temperature range, the thermal contraction and the expansion caused by the transformation act on the residual quenched stress additively. (2) In the case of irreversible high Ni-Fe alloys, of which γ→α transformation lies in the lower temperature range, or in the elastic range, it seems that the effect of thermal stress has been erased and only the effect of transformation appears on the residual stress. (3) With regards to the high Ni-Fe alloys such as no transformation takes place above room temperature, we have obtained the distribution curve of pure thermal stress type (outer-compression, inner-tension) about the usually quenched specimen. However, when the quenched specimen is still more cooled to the liquid oxygen temperature so as to pass the γ→α transformation range, it is recognized that the previous residual stress is relieved. (4) The effect of thermal stress on the residual stress of quenched specimen is more remarkable as the section becomes larger. From the results of experiments above mentioned, we have tried to make some theoretical explanation about the mechanism of origination of quenching stress when quenched from γ to α state of Ni-Fe alloys.
社団法人日本鉄鋼協会の論文
1950-11-25