X線回折析線幅の多点測定による高周波焼入鋼の硬化層深さの非破壊評価

概要

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Both surface hardness and subsurface depth of hardening in carbon steel parts after induction hardening could be nondestructively predicted by measuring a diffraction peak broadening, because the shape of X-ray diffraction peak broadened in proportion to martensitic transformation quantity in our previous study. However, this nondestructive method had a serious problem that the prediction accuracy lowered when thick martensite layer remained on the surface of parts. In this study, peak broadening of plural points including the inspection point were measured, and then the subsurface hardened zone depth was spatially estimated. As the result, the prediction error was bout 2.6 improved to 0.2 mm by the adoption of multipoint evaluation method. The improved prediction error of 0.2 mm by the adoption of multipoint evaluation method. The improved prediction error of 0.2 mm was comparable to that by measuring hardness distribution on the cut surface of parts.
一般社団法人日本機械学会の論文
2008-02-25