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研究了普通退火、固溶热处理、β热处理、固溶时效、等温退火和双重退火六种热处理工艺对Ti-6Al-3Nb-2Zr-1Mo钛合金棒材组织和性能的影响。结果表明:采用普通退火或等温退火时都可以获得等轴组织,棒材在普通退火后具有较高的强度和较低的冲击韧性,在等温退火后强度最低,而冲击韧性最高;采用固溶处理、固溶时效或双重退火时均可获得双态组织,棒材在固溶处理后具有略低的强度和较高的冲击韧性,固溶时效后具有最高的强度和最低的冲击韧性,双重退火后能够获得最佳的强度和冲击韧性;采用β热处理则获得粗大的魏氏组织,材料的冲击韧性很高,但塑性降低非常严重。
The effects of six kinds of heat treatment processes, including normal annealing, solution heat treatment, β heat treatment, solution aging, isothermal annealing and double annealing, on the microstructure and properties of Ti-6Al-3Nb-2Zr-1Mo titanium alloy bars were studied. The results show that the equiaxed structure can be obtained by both normal annealing and isothermal annealing. The bar has higher strength and lower impact toughness after normal annealing, the lowest strength after isothermal annealing and the highest impact toughness. Bismuth can be obtained in the treatment, solution aging or double annealing, the bar has slightly lower strength and higher impact toughness after solution treatment, the highest strength and the lowest impact toughness after solution aging, the double Annealed to obtain the best strength and impact toughness; β heat treatment was obtained coarse Widmanstatten, high impact toughness of the material, but the reduction of plastic is very serious.