Failure analysis and heat treatment process optimization of Cr12MoV steel blanking die

doi:10.13251/j.issn.0254-6051.2021.03.040

Abstract

Abstract: Early failure of Cr12MoV steel blanking die was caused by excessive wear. The service environment, chemical composition, hardness and microstructure were analyzed, and the temperature distribution of the die in service was calculated by finite element simulation. The results show that the chemical composition of the blanking die meets the requirements of the standard, the hardness is slightly lower than the technical requirements, the heterogeneity of eutectic carbides in the microstructure and the size of bulk carbides exceed the standard specification, the field test and the simulation calculation show that the service temperature of the blanking die is higher (<500 ℃). It is found that the causes for the early wear failure of blanking die include improper heat treatment process of the blanking die, defects in microstructure, poor tempering stability and thermal fatigue, tempering softening occuring in the service process due to high temperature. It is suggested that the heat treatment process with the characteristics of high quenching temperature and high tempering temperature should be adopted, and the secondary hardening effect of Cr12MoV steel should be used to give the blanking die good tempering resistance stability. The service life of the blanking die produced by the optimized heat treatment process is 4.62 times of the original one.

Key words: Cr12MoV steel, blanking die, failure analysis, heat treatment, finite element simulation

CLC Number:

TG162.4

Gao Zhiyu, He Wei, Jing Xiukun, Fan Xianjin, Wang Yingxin, Bai Jiang, Wang Daliang. Failure analysis and heat treatment process optimization of Cr12MoV steel blanking die[J]. Heat Treatment of Metals, 2021, 46(3): 206-212.

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