Polyethylene Glycol 系ポリマー焼入液の冷却特性と焼割れ感受性

概要

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Quenching cracks are generally considered to occur under united thermal and transformational stresses. This paper deals with some of the quenching effects on cracks and the hardenability of a steel bar (SUJ2 and S45C) by polyethylene glycol (PEG) solutions. PEG of various molecular weights were prepared for the quench cooling solutions. The cooling rates of silver test pieces were closely related with the viscosities of solutions of various contents of PEG, and the controlled cracks and hardenabilities of steel. Also, the residual stresses caused by quenching were measured by the X-ray diffraction method. A considerable tensile stress and a relatively smaller compressive stress existed on the surface area and in the neighborhood of the center, respectively. The sensitivity of the cracks could be explained clearly by the quench cooling rate.
1986-01-25