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Synopsis : The effect of surface texture on the characteristic temperature during quenching of silver, nickel and SUS 304 stainless steel cylinders in still subcooled water has been investigated. The following results were obtained, 1)The surface texture of specimen does not affect the cooling characteristics at initial solid-liquid contact stage and next vapor blanket stage. But the characteristic temperature and its dependence on liquid subcooling are strongly affected by the surface texture. 2) The characteristic temperature becomes higher with increase of surface roughness and liquid subcooling. Even if the surface roughness are nearly equal, the characteristic temperature is affected by the surface geometry which varies with the methods of surface finish. 3) If the surface of specimen is sufficiently roughened, the characteristic temperature becomes higher with increase of liquid subcooling and its dependence on liquid subcooling shows a similar tendency to that of HENRY'S equation. On the other hand, if the surface is sufficiently smooth, the characteristic temperature approaches to the values predicted by hydrodynamic model by BERENSON.

Effects of Surface Texture on Cooling Curve during Quenching of Heated Metals in Subcooled Water