【摘要】 研究了TC21钛合金在两相区固溶后直接在较低温度保温一定时间水冷到室温(等温淬火)获得的组织与力学性能。将试样在900℃固溶0.5 h,分别在600～60℃温度范围等温保温1 h后水冷到室温,观察微观组织特征,测试宏观和显微硬度以及拉伸性能。结果表明:从600℃到400℃,次生α相宽度逐渐减小;从400℃到60℃,次生α相宽度几乎保持不变。宏观维氏硬度与β转变基体的微观维氏硬度变化规律相同。随着等温淬火温度提高,延伸率和断面收缩率缓慢增加。TC21钛合金的硬度、强度随着次生α相宽度的减小而升高。300或400℃等温淬火所得组织的强度与塑性的匹配性最好。更多还原

【Abstract】 The microstructures and the mechanical properties of TC21 titanium alloy obtained through step-quenching were investigated.The samples were solution treated at 900 ℃ for 0.5 h, and then the step-quenching experiments with temperature from 600 ℃ to 60 ℃were carried out. The microstructure characteristics, hardness and tensile mechanical properties were studied. The results show that the width of secondary α lath gradually decreases from 600 ℃ to 400 the macro-Vickers hardness is the same as that of βtrans matrix. The elongation and the reduction of area slowly increase with the increasing of the quenching temperature. The Vickers hardness, yield strength and tensile strength increase with the decreasing of the width of secondary αlath. The microstructure with a good combination of strength and ductility was obtained through the step-quenching at 300 and 400 ℃.更多还原