局所高周波焼入れ鋼の残留応力分布と硬度のX線的測定

概要

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The rapid heating and cooling and the volume expansion due to the martensitic transformation in partial induction-hardening of steels will induce the strong residual stress which strongly affects the strenght of steels. Cylindrical steel specimens of JIS type S45C were partially induction-hardened and tempered at various temperatures. The residual stress distribution and the Gaussian curve parameter (GCP) representing the X-ray diffraction line broadening were determined by X-rays. A quenched specimen had a high compressive residual stress of approximately 1000 MPa, GCP of 5degree, and Vickers hardness of 800; these values decreased with increasing tempering temperature. The residual stress almost vanished at 773 K and the GCP did not change greatly above this temperature, but the hardness decreased up to 1083 K. The Vickers hardeness H_V of quenched and tempered steels can be nondestructively evaluated from GCP a by H_V=330√<α-0.5>+137C+35, where C is the carbon content (%) of steels.
1991-10-25