TB6钛合金定m值法高温超塑性拉伸试验研究

Superplastic tensile experiment by the fixed m value method at high-temperature for titanium alloy TB6

在以往TB6钛合金研究成果的基础上,自行开发出定m值法超塑性拉伸控制程序来研究TB6钛合金的超塑性能,该控制程序具有自行拉伸控制、实时数据采集、分析处理和绘制监控曲线等功能。对该程序进行充分调试后,将TB6钛合金试样放在最佳变形温度750℃的条件下,设置拉伸程序中的应变速率敏感指数m值分别为0.30,0.35,0.40和0.45进行高温拉伸试验,采集数据得到TB6钛合金伸长率A分别为285%,318%,337%和367%。通过分析试验结果,绘制了应变速率敏感指数m值与伸长率A的关系曲线,再经回归分析,得到TB6钛合金超塑性应变速率敏感指数m值与伸长率A的关系式。

On the basis of previous research results on TB6 titanium alloy,the superplastic performance of titanium alloy TB6 was studied by self- developed superplastic stretch control program of the fixed m value method. The control program has its own stretch control,realtime data acquisition,processing and analysis,drawing monitoring curve and other functions. After the full commissioning program was debugged,high temperature tensile tests of titanium alloy TB6 were conducted with different strain rates sensitivity index m being 0. 30,0. 35,0. 40,0. 45 respectively at deformation temperature 750 ℃,and the elongation A was obtained by collecting data as 285%,318%,337%,367% respectively. Then,after processing and analyzing the experimental results,the relationship curves between strain rate sensitivity index m and elongation A were plotted,and then by regression analysis,the equation between superplastic strain rate sensitivity index m and elongation A was obtained.