锻压技术

温度对TNW700高温钛合金双向超塑性锥杯成形的影响

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

作者：张纪春马利霞李晓华廖金华

分类号：TG135+3

出版年,卷(期):页码：2020,45(4):195-201

摘要：

在910，930和950 ℃这3种温度下,针对我国新型TNW700高温钛合金薄板开展了双向超塑性圆锥胀形试验，并对圆锥胀形过程进行了理论分析。结果显示：在稳定加载气压的作用下，随着温度的升高，TNW700高温钛合金板料的超塑性变形能力呈先提升、后下降的趋势，在930 ℃时获得最佳的成形高度和表面应变，且试件具有最均匀的壁厚分布和最稳定的塑性流变。950 ℃的试样比930 ℃的试样的最大表面应变下降了11.8%，但其具有最大的平均应变速率。对试件的微观组织观察可知：随着温度的升高，材料不仅发生了晶粒长大的现象，而且伴随有β相的产生；在同一温度下，随着变形量的增加，一定体积分数的β相增加有利于稳定该材料的塑性流变。

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.

基金项目：

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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