| The Case Study on Cadmium Embrittlement Failure of High Strength Bolt |
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Young-In Yoon |
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ROK Air Force Academy |
| 고강도 볼트 카드늄 취성파괴 사례연구 |
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윤용인 |
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공군사관학교 |
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| Abstract |
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It happened fractures on special bolt which supported main landing gear actuator up-lock rod of aircraft. Cracks were initiated mainly from the center hole and the external thread of the special bolt. To find out failure root causes, metallographic, fractographic analyses as well as test work were carried out. From the fractographic study by SEM work, fracture occurred by a brittle intergranular type failure. The fracture could be occurred primarily by solid-metal-induced embrittlement due to cadmium embrittler penetrated into the flaw existed after machining work for center hole and thread on the bolt during baking treatment processing to eliminate hydrogen. For its successful application, cadmium EP bolts require proper and adequate baking treatment after electroplating, and make no more drilled center hole on the bolt to prevent same failure. |
| Key Words:
Cadmium Embrittlement, Intergranular Cracking, Secondary Cracking, Cadmium Diffusion, Embrittler |
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