Abstract
Fracture failure analysis of the driving crankshaft of a substation circuit breaker was conducted by means of macroscopic inspection, magnetic particle testing, spectroscopic analysis, mechanical property test and metallographic examination. The analysis results show that the fractured crankshaft is in the cast state, the manufacturer has not carried out follow-up heat treatment after casting, and there are large residual stresses and even cracks in the castings. Finite element analysis shows that the new driving crankshaft produced by Q235-A forged steel plate has higher safety performance and can replace the driving crankshaft produced by casting process.
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