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根据TC4钛合金的超塑性变形机理研究成果,结合设定m值超塑性拉伸方法的设计思路,在VISUAL BASIC环境下编写出了设定m值超塑性拉伸控制程序。在完成对该程序充分调试的基础上,对TC4钛合金进行设定m值超塑性高温拉伸试验,在TC4钛合金最佳变形温度850℃的条件下,将m值分别设定为0.3、0.35、0.4、0.45进行高温拉伸试验,获得TC4钛合金延伸率δ分别为704%、762%、819%、858%,再将应变速率敏感指数m值与延伸率δ对应后生成关系曲线并进行回归分析,最终得到TC4钛合金超塑性应变速率敏感指数m值与伸长率δ的关系式。
According to the research results of the superplastic deformation mechanism of TC4 titanium alloy and the design idea of setting the m-value superplasticity stretching method, a program for setting the m-value superplasticity stretching control was programmed under the VISUAL BASIC environment. Based on the full commissioning of the program, the m-value superplasticity and high-temperature tensile test of TC4 titanium alloy was set. Under the optimal deformation temperature of TC4 titanium alloy of 850 ℃, the m values were set to 0.3, 0.35, 0.4, 0.45 for high temperature tensile test to obtain TC4 titanium alloy elongation δ were 704%, 762%, 819%, 858%, then the strain rate sensitivity index m value and elongation δ corresponding to the relationship between the generation curve Regression analysis, and finally get TC4 titanium alloy superplastic strain rate sensitivity index m value and elongation δ relationship.