汽车工程

汽车工程 ›› 2019, Vol. 41 ›› Issue (12): 1430-1434.doi: 10.19562/j.chinasae.qcgc.2019.012.012

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预压缩对DP590汽车钢板疲劳性能影响研究*

王青峡1, 王光耀2, 赵奕炳2, 范培耕1, 赵岩2   

  1. 1.重庆科技学院冶金与材料工程学院,重庆 401331;
    2.中国汽车工程研究院股份有限公司,重庆 401122
  • 发布日期:2019-12-25
  • 通讯作者: 王青峡,讲师,硕士,E-mail:qingxia_wang@126.com
  • 基金资助:
    *国家自然科学基金(51704055)资助

Study on the Effects of Pre-compression on Fatigue Performance of Automotive DP590 Steel Plate

Wang Qingxia1, Wang Guangyao2, Zhao Yibing2, Fan Peigeng1, Zhao Yan2   

  1. 1.School of Metallurgy and Materials Engineering, Chongqing University of Science & Technology, Chongqing 401331;
    2.China Automotive Engineering Research Institute Co., Ltd., Chongqing 401122
  • Published:2019-12-25

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摘要： 为分析压缩变形对钢板疲劳性能的影响规律,对汽车用DP590钢板热轧原始态与预压缩10%后的疲劳性能和断口形貌进行试验研究。结果表明:施加10%的预压缩变形后材料的疲劳极限从热轧原始态的282提升到312 MPa,增幅达到10.6%。同时,对两种状态下的试样断口进行分析,清晰可见起源区、扩展区和瞬断区。疲劳裂纹的萌生皆始于试样的角部,瞬断区存在大量韧窝和长度不等的显微裂纹。

关键词: DP590, 疲劳性能, 预压缩, 断口形貌

Abstract: In order to analyze the effect of pre-compression on the fatigue performance of steel plate, an experimental study on the fatigue performance and fracture morphology of automotive DP590 steel plates in initial hot rolled state and with 10% pre-compression are conducted respectively. The results show that by applying 10% pre-compression, the fatigue limit of the material increases by 10.6% from 282 to 312 MPa. Meanwhile, the fracture surfaces of specimens in two states are also analyzed, and original region, extended region and instantaneous broken region can be clearly seen. The first fatigue crack appears at the corner of specimen, and there exist a large number of dimples and micro-cracks with different lengths in instantaneous broken region.

Key words: DP590, fatigue performance, pre-compression deformation, fracture morphology