吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (2): 500-504.doi: 10.13229/j.cnki.jdxbgxb201602025

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Influence of stress state on the hardness distribution of S-rail in tailored die quenching process

HU Ping1, 2, ZHANG Jin-nyu1, SHEN Guo-zhe1, LIN Fa-cai1, LIU Li-zhong1   

  1. 1.School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China;
    2.State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
  • Received:2014-07-12 Online:2016-02-20 Published:2016-02-20

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Abstract: The influences of tool temperature and stress state of stamped part on its hardness distribution are investigated in tailed die quenching process of vehicle-use ultra high strength steel BR22MnB5. The results show that the hardness of the stamped part decreases with the increase in tool temperature. When the tool is heated up to 400 °C, a part with hardness of 300 HV in the hot region and 460 HV in the cold region is produced. Furthermore, during the stamping, the inner fillet of the stamped part is compressed while the outer fillet of the blank experiences tensile stress. So the hardness of the outer fillet is higher than that of the inner fillet in the stamped part.

Key words: materials synthesis and processing technology, BR22MnB5, tailored die quenching, stress sate, hardness

CLC Number: 

  • TG306
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