热处理对TC18钛合金丝显微组织与力学性能的影响

摘要

The effect of heat treatment on the microstructure and properties of TC18 titanium alloy wire was studied.The results show that the grains of the hot drawed wire recrystallize and grow obviously, the amount of a phase decreases and the amount of the β phase increases, the tensile strength decreases from 1 110 MPa to 970 MPa with the temperature rises from 760 ℃ to 820 ℃.At 760 ℃, with increasing heat treatment time from 0.5 h to 1.5 h, the grains of TC18 wire grows appreciably, and the tensile strength decreases appreciably.%研究了热处理对TC18钛合金丝材显微组织与力学性能的影响.研究结果表明,对于多道次热拉2.0 mm丝材,随着退火温度由760℃升高至820℃,显微组织明显发生了再结晶和晶粒长大过程,并且α相含量显著减少,β相含量显著增多.随着温度的升高,抗拉强度呈明显下降趋势,由760℃时的1110 MPa下降到820℃时的970MPa.在760℃退火时,保温时间由0.5 h延长到1.5h,丝材的显微组织晶粒略有长大,力学性能略有降低.