Analysis of Stress and Strain in the Course of Quenching

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  • 焼入れ時の応力, 歪計算
  • Analysis of Temperature and Metallic Structure of Axial Symmetrical Parts
  • 軸対称品の温度, 組織の解析

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Thermal and transformation stresses occur during quenching steel and cause crack, strain and so on. The former is due to ununiform cooling and the latter is due to transformation expanding. Specially, as to spring steel with over 0.5% carbon, quenching crack is easily occured by transformation stress. This paper is concerned with the numerical analyses of temperature and transformed structure during quenching under variable cooling condition. This analysis is the first step to make the distribution of stress and strain clearly after quenching.<br>This main conclusions are summarized as follows:<br>(1) When the coolant that the heat transfer coefficient is varied by surface temperature of material is used, the large slope of temperature occurs instantly within material.<br>(2) As the heat transfer coefficient varies rapidly, the cooling curve bends immediately. The bent point of the temperature in center is higher than that of surface. Therefore, on quenching of material with low hardenability, the inverse hardening may happen.<br>(3) If the coolant with high cooling ability is used in the range of martensite transformation temperature, the opportunity of transformation will differ time at each location of material.

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