等温锻造温度对TC6钛合金组织和性能的影响
Effect of Isothermal Forging Temperature on Microstructure and Mechanical Properties of TC6 Alloy
孙朋朋1, 姚泽坤1, 郭鸿镇1, 谭仲刚2
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作者单位：(1. 西北工业大学 材料学院, 陕西 西安 710072; 2. 贵州新艺机械厂, 贵州 平坝 561114)
中文关键字：TC6钛合金； 等温锻造温度； 初生α相； 力学性能
英文关键字：TC6 alloy; isothermal forging temperature; primary α phase; mechanical properties
中文摘要：研究了TC6钛合金在1 × 10 -2 s-1恒应变速率、60%大变形、不同温度等温变形时，温度变化对合金组织、室温拉伸和450 ℃时拉伸性能的影响。结果表明，随等温变形温度的升高，初生α相含量减少，但直径增大，等轴程度增加；925、940 ℃等温变形热处理后形成等轴组织，955 ℃等温变形热处理后形成双态组织，985 ℃等温变形热处理后形成魏氏组织；940 ℃变形试样的室温拉伸强度最好，而955 ℃变形试样的室温拉伸塑性最好。综合分析可知，TC6合金在940～955 ℃ 能获得较好的强度、塑性匹配。
英文摘要：The effect of isothermal forging temperature on microstructure and mechanical properties of TC6 alloy was studied by isothernal forging at the strain rate of 1 × 10 -2 s-1 and 60% deformation. The results indicate that the volume fraction of primary α phase decreases with temperature rising. Equiaxed microstructure forms when the forging temperature is 925 ℃, 940 ℃. Duplex microstructure forms when the forging temperature is 955 ℃; widmanstaten microstructure forms when the forging temperature is 985 ℃ . The tensile strength is best when the forging temperature is 940 ℃, the plastic is best when the forging temperature is 955 ℃. The tensile strength and plasticity are in better combination, when the forging temperature is 940 ℃～955 ℃.