对挤压态和冷轧态 Gr．38钛合金管分别进行了不同温度下的固溶＋时效和退火热处理,研究了热处理温度对其显微组织和拉伸性能的影响.结果表明：挤压管经固溶处理后的组织为由初生α相和β相转变组织组成的双相组织,固溶＋时效处理后的抗拉强度和屈服强度随时效温度的升高先增后降,伸长率和断面收缩率则呈上升趋势；经900℃×1 h固溶＋500℃×4 h时效处理后,挤压管达到最佳的强塑性匹配,抗拉强度、屈服强度、伸长率、断面收缩率分别为1135 MPa,912 MPa,17％,45％；冷轧管经退火处理后的显微组织由等轴α相和晶间β相组成,随着退火温度的升高,其抗拉强度、屈服强度逐渐降低,伸长率逐渐增大；在830℃退火1 h 后伸长率最高,达到27％,抗拉强度和屈服强度分别为937,807 MPa.
The solution and aging treatments and annealing heat treatment at different temperatures were conducted on Gr.38 Ti alloy tube in extrusion state and cold-rolled state.The effects of heat treatment temperature on the microstructure and tensile properties were studied.The results show that after solution treatment,the extrusion tube consisted of a dual phase microstructure,which was composed of the primaryαphase and the transformationβphase.The tensile strength and yield strength of the extrusion tube after the solution and aging treatment first increased then decreased with the aging temperature increasing,while the elongation and reduction of area showed a rising trend.After solution treatment at 900 ℃ for 1 h followed by aging treatment at 500 ℃ for 4 h, the strength and plastic of the extrusion tube achieved the best matching with the tensile strength,yield strength, elongation and reduction of area of 1 135 MPa,912 MPa,17% and 45% respectively.After annealing treatment, the microstructure of the cold-rolled tube consisted of equiaxialαphase and intergranularβphase.With the increase of annealing temperature,the tensile strength and yield strength decreased while the elongation increased gradually. After annealing at 830 ℃ for 1 h,the elongation reached the largest value of 27%,and the tensile strength and yield strength were 937 and 807 MPa respectively.
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