高炭素クロム軸受鋼の焼割れに関する研究 : 第2報,焼割れに及ぼす引き上げ焼入れと遅らせ焼入れの影響

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The preceding paper has reported that the increase of polyalkylene glycol (PAG) polymer concentration results in the decrease of fin cracks and increase of vertical cracks because of the low cooling rate of the quenchant. This paper deals with the effects of interrupted quenching and delayed quenching on quenching. The residual stress and hardness were measured by the X-Ray diffraction method and Rockwell hardness tester, respectively. The interrupted quenching method is more effective to prevent cracking in PAG solutions. Immersed for 6seconds in 5% PAG sol. and for 15 seconds in 15% PAG sol., the steel bars exhibited high hardness and residual stress. Delayed quenching is less effective to prevent cracking. As the crack percentage decreases, the hardness and residual stress become lower in the delayed quenching.
1987-06-25