焼入油の特性ならびに冷却作用について : 油の鋼に対する焼入効果に関する研究 VI

概要

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In the present paper, the following points on the characteristic properties and cooling actions of quenching oil are revealed through analysis of the results reported in previous papers : On the characteristic properties : (1) Simple or similar component oil does not show a remarkable quenching effect. (2) The mixture of low and high boiling point oils shows a remarkable quenching effect, and the maximum quenching effect appears toward the side of low boiling component. (3) The quenching effect of the mixture increases with a larger polarity of low boiling oil, and with a greater thermal instability of high boiling oil. On the cooling actions of the mixture : (4) In the cooling stage I (vapour film), the steel is cooled mainly by vapourization of the low boiling oil. In this stage, bubbles containing cracked hydrocarbons are generated violently. (5) The bubbles separate immediately from the steel surface, and the duration of stage I is short. (6) For the cooling stage II (vapourization), the high boiling oil adheres to the surface with thermal cracking, consequently the steel is cooled by low boiling oil rapidly. (7) For the cooling stages III and IV (convection), cooling proceeds mainly by low boiling oil. (8) Thus the mixture exhibits a remarkable cooling effect.
社団法人日本鉄鋼協会の論文
1965-05-01