논문 해외 국제전문학술지(SCI급) Influence of warm caliber rolling on tensile response and high cycle fatigue behavior of hypereutectoid steel
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2021-02
- 저자명 김정한,김규식,김영균,김현진,이기안
- 학술지명 JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
- 발행처명 ELSEVIER
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 5
홈페이지논문 초록 (Abstract)
The effects of severe plastic deformation on the microstructural evolution, tensile and high cycle fatigue properties of warm caliber-rolled hypereutectoid steels were investigated. As the reduction in area, associated with amount of plastic deformation of 0, 38, 57 and 81%, increased in caliber-rolled steels, strain accumulation was observed near interfaces between cementite and ferrite in pearlite structures. Initial pearlite structures were changed to spheroidized cementite and submicron-sized polygonal ferrite by dynamic recrystallization according to the warm caliber rolling process. The initial hypereutectoid steel had a yield strength of 375 MPa, tensile strength of 850 MPa, and elongation of 16.8%. As the rolling strain increased, yield and tensile strength increased dramatically to 1381 and 1604 MPa, respectively. The fracture elongation of the 57% reduction in area (RA) sample decreased to 5.4%. However, it is noteworthy that the total elongation of the 81% RA sample increased slightly to 7.1%. The fatigue limit was also enhanced from 450 MPa for initial hypereutectoid steel to 850 MPa for 81% RA without decreasing the fatigue strength ratio (sigma(fatigue limit)/sigma(UTS), 0.53). The 81% RA sample had superior fatigue crack propagation resistance and a high tensile strength-elongation combination compared to that of the initial pearlitic hypereutectoid steel. (C) 2020 The Authors. Published by Elsevier B.V.