Transactions of Materials and Heat Treatment

Title：Influence of temperature on biaxial superplastic cone-cup forming for high temperature titanium alloy TNW700

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ClassificationCode：TG135+3

year,vol(issue):pagenumber：2020,45(4):195-201

Abstract：

The biaxial superplastic cone-bulging test was carried out for the new high temperature titanium alloy TNW700 sheet under the temperature of 910, 930 and 950 ℃. And the cone-bulging process was theoretically analyzed. The results show that the superplastic deforming ability of high temperature titanium alloy TNW700 sheet increases at first and then decreases as the temperature increasing under a stable air-loading condition. At the temperature of 930 ℃, the samples obtain the best forming height and surface strain, and the samples show the most uniform thickness distribution and the most stable plastic flow. At the temperature of 950 ℃, the samples exhibit the highest average strain rate, but its maximum surface strain is decreased by 11.8% than that at the temperature of 930 ℃. Besides, by viewing the microstructure of samples, it is found that with the increasing of temperature，not only the grain growth happens but also the β phase emerges. At the same temperature, as the deformation amount is increasing, a certain increasing volume fraction of β phase could be beneficial to its plastic flow stability.

Funds：

国家自然科学基金资助项目（51334006）

张纪春（1986-），男，硕士，工程师 E-mail：zhangjichun123@126.com

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