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논문 기본 정보

자료유형
학술대회자료
저자정보
Lai Teng (Xi’an Jiaotong university) Cheng Guo (Xi’an Jiaotong university)
저널정보
한국소성·가공학회 기타자료 The 8th International Conference and Workshop on numerical simulation of 3D seet metal forming processes (NUMISHEET 2011)
발행연도
2011.8
수록면
71 - 77 (7page)

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The anisotropic evolution of cold rolled 304 stainless steel sheets under pre-strains is investigated experimentally. Uni-axial tensile yield stress and r-value are measured in experiments to represent the anisotropy. The tensile pre-strains under plane stress are achieved by cutting large specimens into small one at different angles to rolling direction. Then the uni-axial tensile tests are performed on the small specimens to investigate the anisotropic evolution. It is found that the yield stress increases with the increase of the pre-strains and decreases with the increase of the angles. However, the changes of r-value are hardly affected by the pre-strains, the small changes of r-value show that the material may remember the rolling direction even after the pre-strains. The sigmoidal shape can be observed in the tensile curves, and its shape depends on the pre-strains and angles. The change of hardening rate can be divided into three stages, and is the most significant at 90° to the rolling direction in the three stages, at the same time the pre-strains cause noncoincidence of the hardening rate curves at the same angle. Moreover, the hardening rate depends on the directions of tensile loading. Second derivative of the hardening rate also can be divided into three stages, and the differences of three stages may mainly be controlled by the different volume fraction of martensite.

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Abstract
INTRODUCTION
EXPERIMENTAL SCHEME
EXPERIMENTAL RESULTS AND DISCUSSION
CONCLUSION
REFERENCES

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