Influence of Ion-Nitriding on Dynamic Fracture Toughness in Cr Alloy Steels

J. Ocean Eng. Technol. 1988;2(1):150-162.

크롬합금강의 동적파괴인성에 미치는 이온실화처리의 영향

오세욱,윤한기,장래웅,김기술

동아대학교 기계공학과,동의대학교 기계설계학과,산업기술연구소 용접연구실,산업기술연구소 용접연구실

Keywords: Ion-nitriding, instrumented impact test, dynamic fracture toughness, impact value, transition temperature region

핵심용어: 이온질화처리, 계장화된 충격시험, 동적파괴인성, 충격치, 천이온도영역

Abstract

The dynamic fracture toughness, $K_{Id}$,is measured in the heat-treated and ion-nitrided Cr-Mo, Ni-Cr-Mo steel using standard and Precracked Charpy specimens an imstrumented impact machine. The value of $K_{Id}$and both the energy of initiate fracture, and the total energy of fracture. Since the $K_{Id}$values of the precraked impact specimens are in accord with their theoretical ones, this testing method is sufficently practical. The effect of ion-nitriding are found to be larger than the heat-treaded specimen.