固溶-时效对TC4钛合金组织与性能的影响

Effect of Solid Solution-Aging on Microstructure and Performance of TC4 Titanium Alloy

研究了不同固溶-时效工艺对TC4钛合金组织形貌、室温力学性能和室温拉伸断口形貌的影响。结果表明:经固溶-时效处理后,针状马氏体α′相和亚稳态β相发生分解,生成弥散稳定的α+β相,提高了TC4钛合金的硬度和强度。当固溶温度一定时,随着时效温度的升高,TC4钛合金的硬度、强度逐渐降低,塑性逐渐升高。当固溶温度为940℃、时效温度为500℃时,TC4钛合金的强度较高,同时又有较好的塑性。固溶-时效态TC4钛合金在室温下有较好的塑性,其拉伸断口表现为韧性断裂。

The investigation was made of the effect of solid solution-aging process on the microstructure, mechanical properties and tensile fracture morphology at room temperature of TC4 titanium alloy. The results show that through solid solution-aging process, acicular martensite α＇ phase and metastable β phase are broken down into dispersive stable α＋β phase, increasing the hardness and strength of TC4 titanium alloy. When the solid solution temperature is constant,the hardness and strength of the TC4 titanium alloy gradually decrease, while its plasticity gradually increases with the aging temperature increasing. Under the conditions of solid solution temperature 940 ~C and aging temperature 500 ℃, the TC4 titanium alloy can be obtained with higher strength and better plasticity. After solid solution-aging treatment, TC4 titanium alloy has better plasticity at room temperature,and its tensile fracture is characterized by ductile fracture.