1. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China; 3. Manufacturing Department, Beijing Shougang Co.,Ltd., Qian'an 064404, Hebei, China
Abstract：The cracking samples of 500 MPa grade tubular torsion beam rear axle crossbeam in bench tests were analyzed by means of metallographic microscope, microhardness tester and scanning electron microscope. The results showed that after the shot blasting, the strengthening effect of the inner and outer walls of the tubular torsion beam was different due to the different degrees of work-hardening in each area of the beam. During the bench test, cracks occurred on the inner wall of the tubular torsion beams with weak degree of work-hardening and resulted in cracks. By optimizing the shot blasting process, the degree of work-hardening of the crack initiation area of the tubular torsion beam was similar to that of other areas on the beam, the hardness fluctuation of the inner and outer walls of the tubular torsion beam was more moderate, and the fatigue life was significantly improved.
2020, Vol. 30 
