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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.1
- 수록면
- 2,562 - 2,574 (13page)
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초록· 키워드
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Superior strength-ductility synergy of 1045 carbon steel produced by aluminothermic reaction casting method was obtainedthrough large deformation rolling at ambient temperature and subsequent annealing, meanwhile, a heterogeneous compositestructure was fabricated. The heterogeneous structural 1045 carbon steel consists of “soft” microcrystalline/ultrafine grained(UFG) ferrite and “hard” cementite nanoparticles. The outstanding strength-ductility synergy was primarily attributed tothe microstructure characteristics about the “soft/hard” interfaces of heterogeneous composite structure. The strength wasimproved due to the second phase reinforcement of hard cementite nanoparticles and decreasing of ferrite grain size, meanwhile,the back stress hardening capacity of “soft/hard” phase also resulted in the high strength. And the favorable ductilitywas ascribed to the generation of geometrically necessary dislocations (GNDs) around “soft/hard” interfaces, which resultedin the high work hardening capability of heterogeneous structural 1045 carbon steel. It is remarkable that tensile strength(∼ 1190 MPa) and high yield strength (∼ 1118 MPa) and good ductility (∼10.6%) can be simultaneously acquired for thecold rolled 1045 steel after annealing at 673 K for 1 h.
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