Transactions of Materials and Heat Treatment

Title：Analysis on cracking reasons of hotworking die for 3Cr2W8V steel

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ClassificationCode：TG147

year,vol(issue):pagenumber：2019,44(8):150-157

Abstract：

The fracture morphology, metallurgical structure and impact toughness of failure parts and normal parts for hotworking die of 3Cr2W8V steel were observed and tested by SEM, EDS, metallographic microscope, impact testing machine and other analytical equipments. The test results show that the raw materials of die smelted improperly in the early stage results in serious segregation of elements, uneven tissue and appearing more banded carbides. At the same time, the improper operation of adding rare earth elements in the later stage of smelting causes the nonmetallic inclusions sort of B level to exceed, and the brittleness of material is significantly enhanced. However, the impact absorption energy of failure parts is 25.7 J, which is far lower than 127.5 J of the normal parts. Thus, when the die is in service, the early cracks appear at the stress concentration area on the inner cavity side of the die, and the shortterm fatigue expansion occurs after crack generation, and then rapidly expands until fracture to cause early failure of the die.

Funds：

广东省省级科技计划项目（2016B020211004）

作者简介：吉国强(1984-)，男，硕士，工程师 E-mail：267266441@qq.com

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