兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (2): 168-172.

• 数理科学 • 上一篇    

SAF 2707HD旋转弯曲疲劳性能

俞树荣*, 程月, 何燕妮, 宋伟   

  1. 兰州理工大学 石油化工学院, 甘肃 兰州 730050
  • 收稿日期:2019-12-19 出版日期:2021-04-28 发布日期:2021-05-11
  • 通讯作者: 俞树荣(1962-),男,甘肃兰州人,博士,教授,博导.Email:yusr@lut.edu.cn

Study on SAF 2707HD fatigue performance in rotating bending

YU Shu-rong, CHENG Yue, HE Yan-ni, SONG Wei   

  1. College of Petrochemical Technology, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2019-12-19 Online:2021-04-28 Published:2021-05-11

摘要: 针对SAF 2707HD双相不锈钢进行旋转弯曲疲劳实验.利用升降法计算得到疲劳极限,根据实验数据绘制应力-疲劳寿命(S-N)曲线,再利用扫描电子显微镜(SEM)对试样疲劳断口进行观察,分析了疲劳裂纹源的类型和断裂机制.统计数据表明:由于试样表面裂纹源引起的断裂基本发生在105次循环或之内,而由于内部裂纹源引起的断裂基本发生在106次循环,相差近一个数量级.为此利用有限元软件进行了疲劳寿命计算,预测结果与实验所得S-N曲线进行对比,确认了疲劳寿命分析的可靠性.

关键词: 超双相不锈钢SAF2707HD, 疲劳寿命, 疲劳断口, 数值模拟

Abstract: The rotational bending fatigue test of SAF 2707HD duplex stainless steel was carried out. The fatigue limit is determined by the up-and-down method, and the stress-lifetime (S-N) curve is hence drawn according to the experimental data. The fatigue fracture surface of the specimen is observed by scanning electron microscope (SEM), and the type of fatigue crack initiation and the corresponding fracture mechanism are analyzed respectively. Statistical data show that the fracture caused by crack origins on the surface of the specimen occurs basically at or within in 105 cycles, while the fracture caused by internal crack origins occurs basically at about 106 cycles, with a difference of nearly one order of magnitude. For this reason, the fatigue life is then predicted by using the finite element software. All predicted results are compared with the experimental S-N curve, which confirms the reliability of our fatigue life analysis.

Key words: super duplex stainless steel SAF 2707HD, fatigue life, fatigue fracture surface, numerical simulation

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