热处理工艺对TC4钛合金组织和性能的影响
Effects of Heat Treatment Process on Microstructure and Mechanical Properties of TC4 Alloy
王悔改1,2, 冷文才1, 李双晓1, 陈明叶1
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作者单位：1. 河南科技大学 材料科学与工程学院, 河南 洛阳 471003; 2. 河南省有色金属材料科学与加工技术重点实验室, 河南 洛阳 471003)
中文关键字：TC4合金； 微观组织； 力学性能； 热处理
英文关键字：TC4 alloy; microstructure; mechanical property; heat treatment
中文摘要：研究了不同热处理条件下TC4合金的微观组织和力学性能。结果表明，退火处理后，组织由α相与α相晶粒间弥散的细小等轴状β所组成，强度、硬度降低，韧性提高；在TC4两相区进行固溶处理，初生α相含量减少，形成了针状的马氏体α''组织，β相则由细小的等轴状逐渐转变为层片状，使得合金强度、硬度提高，伸长率呈下降趋势；时效处理后，针状的马氏体α''和亚稳态的β相将发生分解，转变成稳定的弥散的α相和β相，使合金综合性能得到改善。
英文摘要：The microstructure and mechanical properties of TC4 alloy under different heat treatment conditions were studied. The results show that the microstructure of TC4 alloy consists of α and fine equiaxial β after annealing. The strength and hardness decreases, while the ductility increases. After solution hardening, the primary phase α reduces and needle-like martensites α'' formes. The fine equiaxial β changes into laminas gradually. Then the strength and hardness increases, the ductility decreases. The needle-like martensites α'' and metastable β will break down into disperse α and β after solution hardening and aging. The combination properties of the alloy were improved.