焼入れ焼戻し鋼のX線応力定数

概要

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In X-ray stress measurement, the stress value is obtained from the product of the stress constant K and the slope M of the sin^2ψdiagram which represents the lattice strain. Structural carbon steels of JIS-type S45C were quenched and tempered at various temperatures, and their 95% confidence limits of the stress constant were determined by measuring lattice strains of the specimens subjected to various applied stresses in order to determine the stress of steels accurately. The stress constant increased only slightly with increasing tempering temperature below approximately 773 K (500℃). At higher temperature, it increased rapidly. This remarkable increase in the stress constant is closely related to the microstructure change of the specimen ; above 773 K, the tempered martensite recrys-tallized to form the mixure structure of the ferrite matrix, and the spheroidized cementites which were growing to form laminar cementite plates at higher temperature.
一般社団法人日本機械学会の論文
1992-06-25