Failure Analysis on Rupture of Inlet Valve in High Power DG Diesel Engine
The chemical composition,hardness,microstructure,macromorphology and fractography of failure inlet valve were analyzed.The results show that the grains are relatively small,and there are large particles carbides with angular on microstructure;residual marks exist in the neck of valve.Based on the fault mechanism analysis,it concluds that lower solid solution temperature and the coarse neck surface cause the early fracture of inlet valve.