Analysis on Cracking in Engine Cylinder Head

There was oil leaked from a engine during the bench cycle load test,the cracks were found on the cylinder head by disassembling examination.By means of fracture analysis,metallographic examination,chemical composition analysis and so on,the cracking reasons were analyzed.The results showed that the brittle cracking occurred in cylinder head caused by over-burning,because of the high solution treatment temperature.It was suggested that the solution treatment temperature should be controlled to prevent over-burning and ensure product quality.