Influence of Foreign Object Damage on the Fatigue Strength of S38C Axle Steel
YU Minghua1, GAO Jiewei2,3, LIU Ligen1, LI Yabo4, HAN Jing1, DAI Guangze1, ZHAO Junwen1
1 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China 2 State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China 3 School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China 4 CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, China
Abstract: In order to produce crater defects, compressed-gas gun was used to shoot tungsten steel projectiles at different angles onto the surface of S38C axle steel specimens. The fatigue strength of the defective specimens were obtained by the four-point bending fatigue test method. The geometry parameter and cross-section structure of craters were characterized by optical microscope, and the crater morphology and fractography after fatigue test were detected by scanning electron microscope. The results show that under the 200 m/s shooting speed, the 30° impact has little effect on the fatigue strength of the defective specimens, and the fatigue strength of damaged specimens decreased with the increasement of incident angle (45°, 60°, 75° and 90°). Compared with smooth specimens, the fatigue strength of 90° impact specimens were declined about 40%. The adiabatic shear bands (ASBs) and even cracks were informed below the damaged craters. The fatigue crack mainly nucleated from rim area of crater for the glanced impacted specimens, while fatigue crack started from both sides of impact crater for the perpendicularly impacted one. The fatigue strength of damaged specimens decreased with the increasement of defective depth and cross-section area.
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2021, Vol. 35 
