Transactions of Materials and Heat Treatment

Title：Prediction model on forming limit for ultrathin superalloy strip

Authors： Wan Min Kong Rong Zheng Lihuang Yan Binyu Meng Bao

Unit：

KeyWords：

ClassificationCode：TG381

year,vol(issue):pagenumber：2021,46(9):90-98

Abstract：

In order to evaluate the prediction ability of different theoretical models to the forming limit of ultrathin superalloy strips, the forming limit curves of ultrathin superalloy strips were obtained by bulging experiments. Then, the forming limits of two kinds of ultrathin superalloy strips were theoretically predicted by Swift-Hill instability criterion, multiple ductile fracture criteria and M-K model, and the results were compared with the experimental results. The results show that the prediction accuracies of Swift-Hill instability criterion and traditional ductile fracture criterion are poor, which are not suitable for the prediction of forming limit of ultrathin superalloy strip. By considering the influence of surface coarsening on forming limit, the Swift-Hill model was modified, and the prediction result of the modified model was compared with the prediction results of Lou-huh 2012 criterion, Hu-Chen 2017 criterion and M-K model. It is found that the former three models have basically the same prediction accuracy for forming limit of ultrathin superalloy strip, and all of them are less than 10%, while the prediction accuracy of M-K model is lower, which provide an effective method for establishing the forming limit curve of ultrathin superalloy strip and have important engineering application value.

Funds：

国家自然科学基金资助项目（51975031）;中国航发集团创新基金项目（ZZCX-2018-047）

万敏（1962-），男，博士，教授 E-mail：mwan@buaa.edu.cn 通信作者：孟宝（1985-），男，博士，副教授 E-mail：mengbao@buaa.edu.cn

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