改善低氧TC4-LC及重熔TC4钛合金性能的热处理工艺

Heat treatment for improving mechanical properties of hypoxic TC4-LC and remelted TC4 alloys

通过显微组织分析和力学性能测试,研究了退火、固溶、固溶+时效、β热处理等热处理工艺对自产低氧TC4-LC钛合金和重熔的高氧TC4钛合金组织和性能的影响。结果表明,氧含量对合金力学性能的影响显著,相同成分下力学性能取决于微观组织;热处理只能在一定程度上提高低氧TC4-LC合金的力学性能,不能满足TC4钛合金的力学性能要求;重熔TC4钛合金经不同制度热处理后,强度大幅度提高,塑性除退火处理后有所提高,其它热处理不同程度降低,退火和固溶+时效处理后的力学性能均可以满足TC4钛合金力学性能的要求。

Effects of heat treatment process(annealing,solution treatment,solution and aging treatment andβheat treatment)on microstructure and mechanical properties of the self-produced hypoxic TC4-LC alloy and remelted TC4 alloy were studied by microstructure analysis and mechanical properties test.The results show that the oxygen content has a significant effect on mechanical properties of the alloy,and the mechanical properties depend on the microstructure under the same composition.The mechanical properties of the hypoxic TC4-LC alloy can be only improved to a certain extent by heat treatment processes,which can not meet the requirements of TC4 alloy.The strength of remelted TC4 alloy is greatly improved under different heat treatments,In addition to the annealing treatment,the plasticity is improved,for other heat treatments the plasticity is reduced to varying degrees and the mechanical properties of which after annealing treatment and solution and aging treatment can meet the requirements of TC4 titanium alloy.