Transactions of Materials and Heat Treatment

Title：Analysis on forging internal cracks of yoke shaft

Authors： Wang Yunfei Cao Gengyuan Yue Yuanyuan Cao Shufen Wang Yunluo

Unit： Technology and Material Research Institute China First Tractor Company Limited

KeyWords： yoke shaft forge deformation velocity internal crack

ClassificationCode：TG316

year,vol(issue):pagenumber：2015,40(12):7-10

Abstract：

For the cracks in the neck of a type of cylinder yoke shaft after the induction hardening, the material and heat treatment quality of the yoke shaft were studied comprehensively by chemical composition analysis, metallographic examination, macroscopic and microcosmic observation and thermal etching experiments. The results show that the chemical composition of yoke shaft meets the requirements without the metallurgical defects of the original material. In the internal crack surface of the intercepted sample, free crystallinity surface features can be observed obviously by the electron microscopy. Crack appears on the maximum deformation-position of the shaft. The main reasons of the internal cracks are large deformation, high-temperature caused by excessive heating and strain energy caused by high deformation velocity in the forging process.

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作者简介：王云飞（1965-），男，硕士，教授级高工通信作者：岳渊渊（1989-），女，硕士，助理工程师

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