鋼の組織変化過程におけるクリープ : 高温強度特集号
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概要
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The creep-behavior of commercial steels during the process of metallurgical changes were studied by the anisothermal bend-test. As the specimens, SUP-3, SUJ-2, SEH-3, SCM-5, SKH-2, SKD-4, 0・02%C and high carbon rail-steels which had been variously heat-treated or cold-worked were used. The results were as follows : (1) The hardened steel showed an abnormally large creep during the process of tempering. The higher the temperature of testing, the larger the creep. (2) The magnitude of such creep was proportional to the applied stress and had a closer relation with the hardness variation during the process than with the hardness itself. (3) Except for steels which contained special elements such as W, the higher the carbon content, the larger the creep. (4) The magnitude of such creep was affected by the austenitizing treatment before hardening. The lower the austenitizing temperature and the shorter the holding time, the larger the creep at the temperature above about 500℃.(5) In the hardened-tempered steel, such creep appeared during heating at the temperature which was higher than that at which it had been tempered. (6) In the slack-quenched steel, such creep appeared during heating at the temperature was near and above Ar' temperature. (7) In the steel which had been quenched from the temperature lower than Ac_1, for example 700℃, such creep was recognized to a certain extent as well. (8) The annealed steel did not show such abnormally large creep. (9) The thermal recovery of such creep was recognized during re-heating in the unloaded condition. (10) The cold-worked steel showed such creep during the process of recovery and recrystallization. (11) The creep of steel increased sharply during the process of A_1 and A_3 transformations. The creep of austenite immediately after A_1 transformation was larger than that of austenite at the same temperature during the process of cooling after heating to a higher temperature. (12) The relation between such abnormally large creep and the frequent climbing of dislocations during the process of metallurgical changes was considered.
- 社団法人日本材料学会の論文
- 1962-03-15
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- 鋼の組織変化過程におけるクリープ : 高温強度特集号