Transactions of Materials and Heat Treatment

Title：Failure analysis on the fracture of hot ring-rolling core roller 5CrNiMo

Authors： Zhou Min

Unit： Chongqing College of Electronic Engineering

KeyWords： 5CrNiMo core roller failure analysis fracture

ClassificationCode：TG441.8

year,vol(issue):pagenumber：2015,40(5):145-148

Abstract：

For the fracture failure of core roller 5CrNiMo during the ring-rolling process, the fractured core roller was investigated through macroscope and microscope fractography, chemical composition test, metallographic examination and hardness test. Based on the physical and chemical experiments, the fracture cause of the core roller was analyzed by micro-fracture mechanism and numerical simulation. The results show that the irrational heat treatment process leads to poor surface fatigue resistance of the core roller. Further, during the ring-rolling process, the core roller endures cyclic stress which generates the source of fatigue crack and it expands gradually. Finally, the core roller breaks. It is proposed that the heat treatment process parameters should be controlled strictly and the method of prolong fatigue life of the core roller is adopted by surface peening technology.

Funds：

周敏（1975-），女，硕士，讲师

Reference：

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