不同热处理条件下Ti-6Al-4V-0.1B合金的组织和性能
Microstructure and Properties of Ti-6Al-4V-0.1B Alloy under Different Heat Treatment
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摘要: 研究了不同热处理条件下两相区轧制的Ti-6Al-4V-0.1B合金棒材的组织和性能。研究结果表明,α+β相区热处理后获得等轴组织或双态组织,随着热处理温度的升高,初生α相含量降低;β相区热处理后获得魏氏组织,原始β晶粒及α集束的尺寸随着热处理温度的升高而增大。在拉伸变形时,魏氏组织的强度高于双态组织,但塑性明显低于后者。900℃/1 h,AC+540℃/8 h,AC和1 080℃/1 h,AC+540℃/8 h,AC处理之后获得等轴组织和魏氏组织,具有该组织类型合金最佳的强度和塑性匹配,在拉伸载荷的作用下,TiB相与基体之间存在很好的结合力,TiB相在拉伸过程中传递载荷。Abstract: The relationship of microstructure and properties of Ti-6Al-4V-0.1B alloy rolled at α + β phase region is studied with different heat treatments.The results show that heat treatment at α + β phase region results in equiaxed or bimodal microstructures.The volume fraction of primary α phase decreases with increasing solution temperature.The strength of Ti-6Al-4V-0.1B alloy with Widmannstätten microstructure treated at β phase region is higher than that with duplex microstructure, but the plasticity is just opposite.During β heat treatment, original β grain size and α colonies increase with solution temperature raise.The optimized heat treatments are as 900 ℃/1h, AC + 540 ℃/8h, AC;and 1 080 ℃/1h, AC + 540 ℃/8h, AC.During the tensile deformation process, the TiB phases undertake loading transition and have good bonding force with the matrix.
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