热拉伸蠕变成形Ti-6Al-4V板材的工艺参数优化（英文）

发布时间：2018-12-17 05:57

【摘要】：热拉伸蠕变是一种加工常温难成形薄壁金属坯料的新技术。采用四因素、三水平正交表,优化了热拉伸蠕变Ti-6Al-4V板材的4个工艺参数:温度、拉伸速率、补拉伸量和保温时间。正交试验结果表明:温度是影响回弹角的最重要因素;沿拉伸方向成0°方向的变形材料屈服应力增加,沿45°和90°方向的屈服应力围绕未变形材料的屈服应力小范围波动。经过热拉伸蠕变成形,变形材料微观组织中a相由短细晶粒变成长细晶粒,变形材料显微硬度在成形前后变化很小。综合回弹角、屈服强度指标正交分析结果和材料微观组织变化情况,得出了热拉伸蠕变复合成形的优化工艺参数为:温度700°C,拉伸速率5 mm/min,补拉率2%,保温时间8 min。
[Abstract]:Hot tensile creep is a new technology for processing thin-wall metal billets at room temperature. By using four factors and three horizontal orthogonal tables, four technological parameters of hot tensile creep Ti-6Al-4V sheet were optimized: temperature, drawing rate, amount of supplementary drawing and holding time. The results of orthogonal test show that the temperature is the most important factor affecting the springback angle, and the yield stress of the deformed material along the tensile direction of 0 掳increases, while the yield stress along the direction of 45 掳and 90 掳fluctuates in a small range around the yield stress of the undeformed material. After hot tensile creep forming, a phase in the microstructure of the deformed material changed from short fine grain to long fine grain, and the microhardness of the deformation material changed very little before and after forming. Based on the results of orthogonal analysis of springback angle, yield strength index and microstructure change of materials, the optimum process parameters of hot tensile creep composite forming are obtained as follows: temperature 700 掳C, tensile rate 5 mm/min, tensile ratio 2 and holding time 8 min..
【作者单位】：北京印刷学院机电工程学院;北京航空航天大学机械工程及自动化学院;
【基金】：Project(51175022)supported by the National Natural Science Foundation of China Project(51318040315)supported by the National Defense Pre-research of China Project(09000114)supported by Initial Funding for the Doctoral Program of BIGC Project(E-a-2014-13)supported by BIGC Key Project
【分类号】：TG306;TG146.23

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