锻压技术

TNW700钛合金热成形极限试验研究

英文标题：Experimental research on thermal forming limit of TNW700

作者：刘宝胜吴为

分类号：

出版年,卷(期):页码：2015,40(10):20-23

摘要：

成形极限用于评价板材成形性能，通常采用成形极限图表示。TNW700为新型高温钛合金材料，长时间工作温度为500 ℃，短时工作时间为700 ℃。采用钢模胀形的方法，对TNW700进行了750，800和850 ℃温度下高温成形极限试验研究。结果表明，平面应变路径下的800与850 ℃的极限主应变比750 ℃分别提高29.4%与44.5%，说明材料成形极限随温度升高而提高，微观断口呈现明显韧窝，表明TNW700为延性断裂；基于试验数据拟合了成形极限经验模型参数，在此参数下计算的极限曲线与试验数据符合较好。

Forming limit is commonly applied to evaluate sheet formability, which is usually expressed by forming limit diagram. TNW700 is a new titanium alloy used at high temperature, which serves at 500 ℃ for the long-time process and up to 700 ℃ for the instant time. Research on high temperature forming limit of TNW700 was carried out at 750, 800 and 850 ℃ by rigid tool bulging respectively. It is noted that the limit major strain ratios for plain strain condition at 800 and 850 ℃ are enhanced by 29.4% to 44.5% respectively compared with that at 750 ℃. The result shows that the forming limit increases with the increasing temperature. The displayed dimple occurs on the micro-fracture, which shows ductile fracture of TNW700. The parameters of FLD empirical model are determined based on the experimental data, so the calculated forming limit curve meets the experimental data well.

基金项目：

中国航空研究院航空基金资助项目（201211250001）

刘宝胜（1979-），男，博士，工程师

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