自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 6    June 2019

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Influence of AZ31 sheet treated by cryogenic on punch shearing
HU Zhi-qing(胡志清)1, 2, GUO Chao-fan(郭超凡)3, LI Hong-mei(李洪梅)3

1. Rolling Forging Research Institute, Jilin University, Changchun 130025, China;
2. Key Laboratory of Automobile Materials (Ministry of Education), Jilin University,
Changchun 130025, China;
3. College of Materials Science and Engineering, Jilin University, Changchun 130025, China

Abstract:Punch shearing is used to form the part in the material process. Cryogenic treatment (CT) has active effect on local mechanical properties of steel, but it is still uncertain of the influence of CT on the properties of the magnesium alloy during punch shearing. In this work, the influence of AZ31 sheet treated by cryogenic on punch shearing was studied. Microstructures were observed with a ZEISS optical microscope, and mechanical properties, as well as shear properties were tested by tensile testing and punch shearing. The results show that the number of secondary phase increases and a large number of twins appear in the grains after CT. Meanwhile, the ultimate tensile strength (UTS), the ductility, and hardness of AZ31 are improved, while the yield strength (YS) decreases gradually during CT. During punch shearing, the shearing strength decreases, the rollover radius changes insignificantly, and the height of the burr on the edge of the cross section decreases. At the same time, a larger proportion of smooth zone on the cross section has been achieved.

 

Key words: AZ31 magnesium alloy; cryogenic treatment; mechanical properties; punch shearing

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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