Abstract��Failure analysis was directed against water��s leaking untimely through cylinder head during an engine��s durability test. At first, it was found that crack source came from inner surface by macroscopic view checking. Crack source grown just along indentation around outer-circle of the sand cleaning hole, extending interrupted along indentation, in the meantime penetrating the wall from the cooling chamber. Cracks appeared many times in many location with thermal cracks characteristic. It was further?confirmed that fracture causes of cylinder head was thermal fatigue by normal failure analysis method such as visual inspection, microscope check,element analysis and hardness test.While casting and mechanical stress played indirect action.
���ӣ���������ȷ棬�����. �������������ǿ���ԭ�����[J]. �й������ڿ���, 2015, 33(1): 45-47.
JIANG He��YANG Guo-bin��ZHANG Xian-feng��FENG Qing-feng. Fracture causes analysis of cylinder head on automotive engine. Chinese Journal of Iron and Steel, 2015, 33(1): 45-47.
2015, Vol. 33 
