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Analysis on Root Cracking of Crankshaft Gear after Induction Hardening
Pages: 69-70,71
Year: Issue:  4
Journal: Heat Treatment

Keyword:  tooth rootinduction hardeningdelayed cracking;
Abstract: In a few hours after being medium-frequency induction hardened ,the cracks were found in root of crankshaft gear made of 42CrMoA steel of some type of heavy-duty diesel engine.The analysis shows that the delayed cracking of the root is attributed to excessive tensile stress which originated from the effect of heat producing during afterwards hardening of the teeth on king journal early hardened.The root cracking has been avoided by adopting several measures which are as follows:(a)the king journal is stress relieved by heating to 240 ℃for 4 h after being hardened and grinded and before the teeth being hardened;(b)the hardened king journal is additionally cooled during hardening of the teeth;(c)the round joint of king journal and tooth side is not hardened.
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