鋼鉄の熱衝撃強度と熱疲労強度の相関性

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In recent years, the problem of thermal shock of metallic materials has been the subject of many studies, and several researchers have made fundamental works in this line. Surveying the previous works, it is found most of the studies on thermal shock are limited within the experiments on non-metallic materials, and so-called "thermal shock parameter" is defined as a criterion for thermal shock resistance. Thermal shock parameter is analysed from the concept based on maximum principal stress theory and elastic thermal stress theory. In the past study on nonmetallic materials such as ceramic, the thermal shock parameter is adopted as the measure of thermal shock resistance. However, this is true within the limited case of non-metallic materials. For the cases of most metallic materials, there are several questions as to criterion with which thermal shock resistance is evaluated Furthermore, there is an open question as to the study on transition phenomenon from thermal shock fracture to thermal fatigue fracture. In this connection, it is necessary to establish the relation between thermal shock strength characteristics and thermal fatigue strength characteristics. The authors, as well, have been interested in the problem concerned with thermal shock, and have done some works on the relation between tensile strength characteristics and thermal fatigue strength characteristics by employing heat-resisting metallic materials. In the present paper, the results of thermal shock tests for different heat-transfer conditions are presented, and the results are compared with those of thermal fatigue tests. Two types of tests of thermal shock and thermal fatigue are performed by solid cylindrical specimen of cast iron (3.79% C). Two sorts of heat-transfer conditions are realized by using air cooling and air mist cooling. Both tests are made by employing a conventional thermal fatigue test apparatus, and both ends of specimen are constrained at upper temperature level in thermal cycling. Maximum temperature level is chosen as 600℃.
1963-03-15

鋼鉄の熱衝撃強度と熱疲労強度の相関性

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