锻压技术

时效温度对钛合金微观组织和力学性能的影响

英文标题：Influence of aging temperature on microstructure and mechanical properties for titanium alloys

作者：周平熊淑秋周林安文俊

分类号：TG166

出版年,卷(期):页码：2025,50(6):180-186

摘要：

利用扫描电镜、透射电镜、X射线衍射、金相观察和力学测试等方法研究了700 ℃固溶后不同时效温度处理对钛合金微观组织、硬度及拉伸力学性能的影响。结果表明：经450~550 ℃时效处理后，钛合金显微组织包括β相以及在晶界上密集析出呈交错细线形状的α相；550 ℃时效处理后，钛合金析出的α相较450 ℃时更长且更宽，α相由细线形状长大变粗。经不同时效温度处理后钛合金含有稳定的α相和β相，β相衍射强度随着时效温度的升高逐渐增大。钛合金析出α相的数量随着时效时间的延长而增多。时效温度由450 ℃升高至490 ℃时，钛合金的屈服强度略有上升，抗拉强度变化不大，时效温度降低至390 ℃时，抗拉强度达到1442.6 MPa。钛合金在450 ℃时效温度处理下的硬度值达到最大。

The influences of different aging temperature treatments after solution at 700 ℃ on the microstructure, hardness and tensile mechanical properties of titanium alloy were studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, metallographic observation and mechanical testing. The results show that after aging treatment at 450-550 ℃, the microstructure of titanium alloy includes β phase and α phase which is densely precipitated on the grain boundary with the shape of staggered fine lines. After aging treatment at 550 ℃, α phase precipitated in titanium alloy is longer and wider than that at 450 ℃, and α phase grows from a fine line shape to coarse one. After treatment at different aging temperatures, titanium alloy contains stable α and β phases, and the diffraction intensity of β phase gradually increases with the increasing of aging temperature. The number of precipitated α phase in titanium alloy increases with the extension of aging time. When the aging temperature increases from 450 ℃ to 490 ℃, the yield strength of titanium alloy increases slightly, and the tensile strength changes little. When the aging temperature decreases to 390 ℃, the tensile strength reaches 1442.6 MPa. The hardness value of titanium alloy reaches the maximum at the aging temperature 450 ℃.

基金项目：

江西省教育厅科学技术研究项目（GJJ2203018）

作者简介：周平（1970-），男，硕士，教授，高级工程师，E-mail：zhouping@jxue.edu.cn

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