Transactions of Materials and Heat Treatment

Title：Strain fatigue life analysis of hot-forging die for air valves

Authors： Liang Cha Zhang Zhengrong Sun Yousong Mo Dongqiang

Unit： Guangdong University of Technology Huaiji Dengyun Auto-Accessories Manufactory

KeyWords： hot-forging die for air valves low-cycle fatigue thermal-mechanical coupling fatigue life

ClassificationCode：TG386

year,vol(issue):pagenumber：2015,40(3):78-63

Abstract：

For the early fatigue failure of hot-forging die for air valves, the forming process of air valves was numerically simulated by MSC.Marc software based on thermal-mechanical coupling model, and the fatigue process of die and the low-cycle fatigue life prediction of the hot-working die steel H13 (4Cr5MoSiV1) were carried out by MSC.Fatigue software. The temperature, the equivalent thermal strain distribution, strain-life curve, equivalent stress of the cyclical changing node and other factors in the die were analyzed during the hot forging process. The distribution of die fatigue life was obtained finally. The results show that the failure locations firstly concentrate on the area of R root, with a fatigue life of only 1460 times. The analysis results are in a good agreement with that in reality, and the fatigue life prediction of the hot-forging die is realized.

Funds：

国家自然科学基金资助项目（50975050）;广东省“扬帆计划”引进创新创业团队专项资助项目（201312G02）

梁姹（1990-），女，硕士研究生

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