Influences of High-Temperature Diffusion on the Homogenization and High-Temperature Fracture Behavior of 30Cr1Mo1V

High-temperature diffusion is an important process for manufacture of 30Cr1Mo1V rotor steel to alleviate the dendritic segregation and improve the hot workability of the steel ingots. However, the functions and significances of high-temperature diffusion in heavy forging production are still academically controversial. This paper investigated the influences of high-temperature diffusion on the homogenization of dendritic segregation and dendritic structure of 30Cr1Mo1V. After the samples being treated under different high-temperature diffusion process, hot stretch experiments have been performed to study the influences of high-temperature diffusion on the flow stress and the fracture behavior. The results reveal that after being held at high temperature for a long period of time, the segregation ratios of Mo element were greatly reduced and no dendritic structure can be observed by optical microscopy. The percent reduction in the area and the fracture limit increases as temperature increases. Moreover, high-temperature diffusion has less influences on the flow stress while, at different temperature ranges, the influences on fracture limit differ considerably.