作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《材料热处理学报》 2014年第8期23-30,共8页

摘　　要： 采用五因素四水平正交试验,研究固溶-时效中固溶温度和时间、固溶冷却方式、时效温度和时间对TC18钛合金显微组织及抗拉强度和伸长率等性能的影响。结果表明,抗拉强度的主要影响因素为固溶冷却方式与时效温度;伸长率的主要影响因素为固溶温度、固溶冷却方式及时效温度。降低固溶温度和延长时效时间均导致等轴α含量增加、尺寸增大,引起合金伸长率升高;降低固溶冷却速度使得等轴α含量增加、尺寸增大和细针α含量减少,合金伸长率上升、抗拉强度下降;降低时效温度导致细针α含量增加和等轴α含量降低、尺寸减小,合金抗拉强度大幅上升、伸长率小幅下降;时效时间对合金组织与性能的影响均较小。 Orthogonal experiment was employed to investigate the influence of solid solution and aging treatment process on microstructure and mechanical properties of TC18 titanium alloy.The results show that tensile strength of the alloy mainly dependents on solution cooling method and aging temperature,while the elongation is largely affected by solution temperature,solution cooling method and aging temperature.With the decreasing of solution temperature and the extending of solution time,both the content and size of equiaxial α phase increase,which leads to higher elongation.Decrease the solution cooling rate increases the content and size of equiaxial α phease,decreases the content of thin acicular α phase,which leads to higher elongation and lower tensile strength.With the decreasing of aging temperature the content of thin acicular α phase greatly increases,yet the content and size of equiaxial α phase slightly decrease,thus largely increases tensile strength and slightly decreases elongation.The aging time has little impact on microstructure and mechanical properties.

关 键 词： 钛合金 固溶 时效 正交试验 组织 力学性能

领　　域： [金属学及工艺] [金属学及工艺]