Characteristics of Fatigue Crack Growth for Camshaft Material Applied to High Frequence Induction Treatment

J. Ocean Eng. Technol. 2009;23(3):46-52.

Lee Hyun-Jun,Park Sung-Ho,Park Won-Jo

Department of Mechanical and Precision Engineering Gyeongsang Nat'l. Univ.,Department of Mechanical and Precision Engineering Gyeongsang Nat'l. Univ.,Department of Mechanical and Aerospace Engineering Institute of Marine Industry Gyeongsang Nat'l. Uni

고주파열처리를 적용한 캠 샤프트 소재의 피로균열진전 특성

이현준,박성호,박원조

경상대학교 대학원 정밀기계공학과,경상대학교 대학원 정밀기계공학과,경상대학교 정밀기계공학과 해양산업연구소

Keywords: High frequence induction treatment, Camshaft, Compressive residual stress, Fatigue crack growth, Martensite, Fracture surface

핵심용어: 고주파열처리, 캠샤프트, 압축잔류응력, 피로균열진전, 마르텐사이트, 파면

Abstract

Nowadays, many components in automobile, aircraft, offshore structure and industry require lightness and high strength. However, since developments of advanced materials have limitations, it mainly is applying to method of surface hardening. This study offered research about camshaft that is one among engine important component. The material used in this study is 0.53% carbon steel as structure material of camshaft, splineshaft, coupling, pulley, driveshaft et cetera. Camshaft is processed using mainly carbon steel, and receives wear and fatigue by special quality high speed of parts. Therefore, camshaft need surface hardening to improve camshaft's fatigue life and increase durability of engine. This study compare to residual stress and martensite microstructure created by high frequency induction treatment, and these results lead to the conclusion of fatigue crack growth characteristics.