Transactions of Materials and Heat Treatment

Title：Experimental and simulation study on early failure of hot forging mold for H13 steel ring splint

Authors： Yan Tao1 Tang Tianyue2 Qi Haisheng1 Qiao Jinfang1 Yang Zhiyong2

Unit： 1.Baoji Bao De Li Electrification Equipment Co. Ltd. 2.Beijing Jiao Tong University

KeyWords： H13 steel hot forging mold failure analysis crack heat treatment process

ClassificationCode：TG315.2

year,vol(issue):pagenumber：2024,49(6):197-207

Abstract：

In order to solve the failure problem of hot forging mold for H13 steel ring splint due to frequent early cracks in the process of using, combined with the failure forms and parts of ring splint mold, the material composition, hardness and metallurgical organization of the taken specimens were analyzed by using direct-reading spectrometer, Rockwell hardness tester, optical microscope and scanning electron microscope, respectively. At the same time, the mechanical properties of material were examined by tensile test and impact test, and the failure causes of hot forging mold for H13 steel ring splint were analyzed and discussed by combination of finite element simulation analysis. Finally, the optimization of heat treatment process was carried out for the causes of mold failure. The results show that the main reason for the early failure of mold is the organization segregation and more eutectic carbide inclusions in mold material, and at the same time, the phenomenon of insufficient tempering, results in martensite residue, M-A organization in the tempering failed to fully transform, resulting in the insufficient and uneven tempered hardness, and there is a large concentration of stress in the failure part of the mold during forging, which exceeds the fatigue strength of the material, resulting in the deformation and early cracking of the mold. Optimized heat treatment process is quenching at 1060 ℃ + 1st tempering at 580 ℃ + 2nd tempering at 180 ℃, and the material strength is significantly improved, while the tensile strength increases by about 28% and the yield strength increases by about 58%.

Funds：

国家自然科学基金面上项目（52372345）

作者简介：闫涛（1984-），男，学士，副高级工程师,E-mail：ceeyantao@126.com;通信作者：杨智勇（1975-），男，博士，教授,E-mail：zhyyang@bjtu.edu.cn

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