锻压技术

高温合金超薄带材成形极限预测模型

英文标题：Prediction model on forming limit for ultrathin superalloy strip

作者：万敏孔融郑立皇闫彬宇孟宝

关键词：高温合金超薄带材成形极限 Swift-Hill失稳准则韧性断裂准则 M-K模型

分类号：TG381

出版年,卷(期):页码：2021,46(9):90-98

摘要：

为了评估不同理论模型对高温合金超薄带材成形极限的预测能力，通过胀形实验获得不同高温合金超薄带材成形极限曲线。采用SwiftHill失稳准则、多种韧性断裂准则以及MK模型，对两种高温合金超薄带材成形极限进行理论预测，并与实验结果对比。结果表明，SwiftHill失稳准则和传统韧性断裂准则的预测精度较差，不适用于高温合金超薄带材成形极限的预测。通过考虑表面粗化对成形极限的影响修正了SwiftHill模型，并将修正模型预测结果与LouHuh 2012、HuChen 2017准则和MK模型预测结果进行比较，发现前3种模型对高温合金超薄带材的成形极限具有基本相同的预测精度，且均不超过10%，而MK模型的预测精度较低。为高温合金超薄带材成形极限曲线的建立提供了有效方法，具有重要的工程应用价值。

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.

基金项目：

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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