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在β单相区对钛合金锻件进行了等温锻造和热处理,研究了等温锻造温度、变形程度和热处理工艺对钛合金锻件显微组织和力学性能的影响,并探讨了工艺参数的作用机理。结果表明:随着等温锻造温度的提高,初生α相的宽度有所增加,次生α相宽度有所减小,而β转变组织的含量有较大幅度降低;随着变形程度的增加,钛合金锻件的原始β晶粒大小、晶界α相宽度、粗片状α相宽度和面积分数逐渐增加,而晶内细片状α相宽度逐渐减小;940℃×1 h水冷+550℃×5 h空冷的试样中粗片状α相宽度、β转变组织中二次α相宽度最小,而β转变组织面积分数最大;等温锻造温度为995℃、变形程度为75%、940℃×1 h水冷+550℃×5 h空冷热处理的钛合金锻件可以取得较好的强度与塑性结合。
The isothermal forging and heat treatment of titanium alloy forgings were carried out in β single phase zone. The effects of isothermal forging temperature, degree of deformation and heat treatment on the microstructure and mechanical properties of titanium alloy forgings were investigated. The mechanism of the process parameters was also discussed. The results show that with the increase of the isothermal forging temperature, the width of the primary α phase increases, the width of the secondary α phase decreases and the content of β transformation decreases. With the increase of the deformation, The initial β grain size, the α phase width, the coarse α phase width and the area fraction of the as-grown forgings gradually increase, while the width of the α phase in the intragranular thinning decreases gradually. The 940 ℃ × 1 h water cooling + 550 ℃ × The width of the coarse α-phase in the air-cooled samples at 5 h was the lowest, while the width of the secondary α phase in β-transformation was the smallest, while that of β-transformation was the largest. The isothermal forging temperature was 995 ℃, the deformation was 75% and 940 ℃ × 1 h water cooling +550 ℃ × 5 h air-cooled heat treatment of titanium alloy forgings can achieve better strength and plastic combination.