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논문 기본 정보

자료유형
학술저널
저자정보
Fengming Qin (Taiyuan University of Science and Technology) Yajie Li (Taiyuan University of Science and Technology) Wenwu He (Taiyuan University of Science and Technology) Xiaodong Zhao (Taiyuan University of Science and Technology) Huiqin Chen (Taiyuan University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.6
발행연도
2017.1
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1,087 - 1,096 (10page)

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초록· 키워드

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The aging precipitation behavior in Mn18Cr18N austenitic stainless steel was investigated at temperatures from600 °C to 900 °C. During isothermal aging treatment, the primary precipitate was Cr2N with a = 0.478 nm and c =0.444 nm, and it preferentially nucleates along initial grain boundaries and gradually grows towards the interior ofgrains in discontinuous cellular way. Meanwhile, a small amount of granular face-centred cubic M23C6 with a =1.066 nm also were observed, which mainly form along grain boundaries. The effect of these precipitates onmechanical properties of the alloy was studied. It was found that precipitates result in degeneration of the matrixhardness. Meanwhile, the SEM morphologies of aged tensile sample show that the brittle fracture predominatesduring deformation, i.e. the fracture mode transforms from intergranular fracture to transgranular fracture with theincreasing of aging time. Compared with the solution-treated sample, the strength of the aged tensile samplesslightly decreases and plasticity remarkably deteriorates.

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