Reason research of the Low Impact Value of 2Cr11Mo1VNbN Ring Forging

摘要

2Cr11Mo1VNbN steel was mainly used in the manufacture of turbine rotor blades,bolts,nuts and other important parts.However,in actual production,the impact value of their products often failed to meet requirements leaving the material scrapping.In this paper,through observation and analysis of the sample microstructure,fracture morphology and the precipitated phase by electron microscopy and energy dispersive spectroscopy,the results showed that:the low impact value of 2Cr11Mo1VNbN steel ring forgings was caused by the abnormal and large grain,uneven tissue and bulky niobium carbide exhalatted from grain boundary which was serious damage to the stability of grain boundary.