摘要
采用最大m值法,在温度分别为850℃、870℃、900℃下,对改锻前及改锻后的TC4-DT钛合金棒材进行超塑性拉伸实验。实验结果表明,根据最大m值法拉伸试样TC4-DT在870℃的变形温度下,延伸率达到了最大值1240%,表明该类型TC4-DT钛合金的最佳超塑性变形温度在870℃左右;并且改锻后较细晶粒尺寸的TC4-DT棒材的超塑性明显高于改锻前的较粗晶粒组织,延伸率平均提高了一倍;分析显微组织可知,在超塑性拉伸变形中发生了动态再结晶。
Superplastic deformation characteristics of TC4-DT titanium alloy were investigated within temperature of 850℃- 900℃ by the method of maximum rn value method. Experimental results show that, according to the tensile test results based on maximum rn value method of TCA-DT titanium alloy under the deformation temperature of 870℃, the maximum elongation reached 1240%, shows that the best deformation temperature of this type TCA-DT titanium alloy is at about 870℃. The superplasticity of after-forging TC4-DT bar is better than the original bar, and the elongation increased on average of one times. Anal ysis the microstructure shows that dynamic recrystallization occured in the superplastic tensile deformation.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2013年第6期94-97,共4页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51075196)
关键词
TC4-DT钛合金
超塑性
最大m值法
TC4-DT titanium alloy
superplasticity
maximum rn value method