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고응력 스프링강의 피로성질에 미치는 미세조직의 영향 = Microstructural Influence on the Fatigue Properties of High Strength Spring Steels

제어번호 : 3234205

저자명 : 남원종 ,이종수 ,이기안 ,유선준 ,최해창

학술지명 : 대한금속·재료학회지(Korean Journal of Metals and Materials)

권호사항 : Vol.35 No.11 [1997]

발행처 : 대한금속재료학회(대한금속학회)

발행처 URL : http://www.kim.or.kr

자료유형 : 학술저널

수록면 : 1484-1491(8쪽)

언어 : Korean

발행년도 : 1997년

KDC : 436

소장기관 :

  • 고려대학교 중앙도서관
  • 서울대학교 중앙도서관
  • 영남대학교 과학도서관
  • 중앙대학교 서울캠퍼스 중앙도서관

판매처 : 한국학술정보 한국학술정보 에서 제공하는 논문입니다.

  • 초록
    • The high cycle fatigue properties of a high strength spring steel have been investigated in relation to the microstructural variation through austenzing followed by tempering at different temperatures. The rotating bending fatigue and fatigue crack growth (FCG) tests were carried out and a transmission electron microscope equipped with an energy dispersive X-ray unit was used to characterize the precipitates behavior. The results indicate that the fatigue endurance (σ_f) increases with increasing tempering temperature, reaching a maximum at 450℃, then decreases at 500℃. The increase of σ_f is mainly attributed to the refined distribution of precipitation, together with the structural uniformity of tempered martensite. The inhomogeneity of tempered martensite due to excessive precipitation acounts for the decrease of σ_f, at 500℃. By contrast, the FCG results show an insensitivity of the stage-II growth behavior to the microstructural changes for the whole range of tempering temperature tested. The insensitivity is interpreted in terms of the counterbalancing microstructure-dependent contributions to the FCG, behavior.