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논문 기본 정보

자료유형
학술저널
저자정보
Chuanjie Wang (Harbin Institute of Technology at Weihai) Shaoxi Xue (Harbin Institute of Technology at Weihai) Gang Chen (Harbin Institute of Technology at Weihai) Peng Zhang (Harbin Institute of Technology at Weihai)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.2
발행연도
2017.1
수록면
264 - 271 (8page)

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초록· 키워드

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In micro-scaled plastic deformation, material strength and ductile fracture behaviors of thin sheet in tensionare quite different from those in macro-scale. In this study, uniaxial tensile tests of Monel 400 thin sheets withdifferent microstructures were carried out to investigate the plastic deformation size effect in micro-scale. Theexperimental results indicate that the flow stress and fracture strain departure from the traditional empirical formulawhen there are only fewer grains across the thickness. And the number of dimples on the fracture surface isgetting smaller with the decreasing ratio of specimen thickness to grain size. Then, a constitutive model basedon dislocation density considering the free surface effect in micro-scale is proposed to reveal the mechanism ofthe flow stress size effect. In addition, a model is proposed considering the surface roughening inducing thethickness nonuniform and the decrease of micro-voids resulting from the reduction of grain boundary densitywith the decreasing ratio of specimen thickness to grain size. The interactive effects of the surface rougheningand the decrease of micro-voids result in the earlier fracture in micro tension of the specimen with fewergrains across the thickness

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