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논문 기본 정보

자료유형
학술저널
저자정보
Kwang-Geun Chin (Pusan National University) Chung-Yun Kang (Pusan National University) Jaeyeong Park (Pohang University of Science and Technology) Sunghak Lee (Pohang University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.3
발행연도
2018.1
수록면
489 - 495 (7page)

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초록· 키워드

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An austenitic Hadfi eld steel was roll-bonded with a 1.8-GPa-strength-grade martensitic hot-press-forming (HPF) steel tofabricate a multi-layer steel (MLS) sheet. Near the Hadfi eld/HPF interface, the carburized and decarburized layers wereformed by the carbon diff usion from the Hadfi eld (1.2%C) to HPF (0.35%C) layers, and could be regarded as kinds of verythin multi-layers of 35 μm in thickness. The tensile test and fractographic data indicated that the MLS sheet was fracturedabruptly within the elastic range by the intergranular fracture occurred in the carburized layer. This was because C wasmainly segregated at prior austenite grain boundaries in the carburized layer, which weakened grain boundaries to inducethe intergranular fracture. In order to solve the intergranular facture problem, the MLS sheet was tempered at 200 °C. Thestress–strain curve of the tempered MLS sheet lay between those of the HPF and Hadfi eld sheets, and a rule of mixtures wasroughly satisfi ed. Tensile properties of the MLS sheet were dramatically improved after the tempering, and the intergranularfracture was erased completely. In particular, the yield strength up to 1073 MPa along with the high strain hardening andexcellent ductility of 32.4% were outstanding because the yield strength over 1 GPa was hardly achieved in conventionalaustenitic steels.

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