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http://dx.doi.org/10.21289/KSIC.2020.23.1.73

Failure Analysis of SCM435 Bolt for Fixing Automotive Air Brake Spring  

Yun, Seo-Hyun (Interdisciplinary Program of Marine Convergence Design, Pukyong National University)
Kim, Min-Heon (Interdisciplinary Program of Marine Convergence Design, Pukyong National University)
Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Industry Convergence / v.23, no.1, 2020 , pp. 73-81 More about this Journal
Abstract
This study analyzed the causes of failure of SCM435 bolts that fix the springs of automobile air brakes that have been fractured during use. The cause of failure was analyzed using SEM, EDS, metallogical microscope and Vickers hardness tester. In the fracture, the ratchet mark began at the outer boundary of crack origin, and the grains at crack origin were found to have clear intergranular corrosion. One SCM435 bolt was subjected to a stress of 398 MPa, it's a stress of about 80% of the fatigue limit. As a result of such a large applied stress, cracks occurred at the corrosion origin and were fractured. In order to prevent the SCM435 bolt from fracture, it is necessary to use the correct composition, the accuracy of heat treatment, preventing damage by external impact, preventing corrosion of the damage part by moisture, and introduction a compressive residual stress by peening.
Keywords
SCM435 Bolt; Automotive Air Brack; Failure Analysis; Fatigue Limit;
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