Fatigue Crack Propagation of Laser Arc Hybrid Welded Joint of Bainitic Steel

被引:3
作者
Han Xiaohui [1 ]
Lei Zheng [2 ]
Li Rendong [2 ]
Yan, Liu [2 ]
Chen Hui [2 ]
机构
[1] CSR Qingdao Sifang Co, Qingdao 266111, Shandong, Peoples R China
[2] Southwest Jiaotong Univ, Coll Mat Sci & Engn, Chengdu 610031, Sichuan, Peoples R China
来源
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG | 2019年 / 46卷 / 10期
关键词
laser technique; bainitic steel; laser arc hybrid welding; fatigue crack propagation; secondary crack; TOUGHNESS; ZONE;
D O I
10.3788/CJL201946.1002014
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Standard compact tensile (CT) samples were tested to compare the fatigue crack growth rates (FCGRs) of the arc dominated zone (ADZ), laser dominated zone (LDZ), heat affected zone (HAZ), and base metal (BM), which were sampled on the laser arc hybrid welding joints of an ultra-low-carbon bainitic steel. The growth features of the fatigue crack in each microcell were summarized, and the reason for the deflected path of crack growth was explained. The result shows that the FCGRs increase but the accelerated velocities of the HAZ and BM decrease with the growth of the stress intensity factor (SIF). At the low SIF, the FCGRs decrease in the following sequence: BM, HAZ, ADZ, and LDZ. When the SIF is sufficiently large, the sequence changes to: LDZ, ADZ, BM, and HAZ. The crack-path deflection in the HAZ is observed clearly, and the secondary cracks increase when the SIF increases. However, the crack deflection in the weld zone is not observed clearly. This difference is attributed to the non-uniformity in the material composition and microstructure. The observation of the fracture explains that the generation of the secondary cracks is associated with the brittle phases. Further, the secondary cracks arc primarily responsible for the change in the FCGRs.
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页数:8
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