固溶时效态TC11钛合金微观组织与高温拉伸性能的研究  

Study on microstructure and high temperature tensile properties of solution aging state TC11 titanium alloy

作　　者：王冠军 张明玉 梁飞龙 董晓峰 WANG Guanjun;ZHANG Mingyu;LIANG Feilong;DONG Xiaofeng(Xinjiang Xiangrun New Materials Technology Co.,Ltd.,Hami 839000,Xinjiang,China)

机构地区：[1]新疆湘润新材料科技有限公司,新疆哈密839000

出　　处：《四川冶金》2024年第5期17-20,共4页Sichuan Metallurgy

摘　　要：以TC11钛合金作为研究材料,对该合金进行固溶时效处理,并在400℃条件下进行拉伸性能测试,以研究固溶时效态TC11钛合金微观组织与高温拉伸性能,结果表明:合金经两相区温度固溶处理后,组织主要由形貌为长条状和等轴状的初生α相以及形貌为针状的次生α相构成,固溶温度升高至单相区温度的过程中,组织中初生α相的含量减少并消失,而次生α相含量不断增加。在固溶温度升高的过程中,发现合金抗拉强度和屈服强度随之增大,其中其抗拉强度由545 MPa升至610 MPa;屈服强度由440 MPa升至510 MPa。而断后延伸率与断面收缩却逐渐减少,断后延伸率由35%降低至18%;断面收缩率由55%降低至37%。与室温拉伸断口形貌相比较,高温条件下的拉伸断口中韧窝尺寸明显更大,且深度更深。Taking TC11 titanium alloy as the research material,the alloy was treated by solid solution and aging,and the tensile test was carried out at 400℃ to study the microstructure and high temperature tensile properties of the solid solution and aging TC11 titanium alloy.The results show that the microstructure of the alloy is mainly composed of primary α phase with long strip and equiaxed shape and secondaryαphase with needle shape after solid solution treatment in two-phase region.The content of primaryαphase decreases and disappears,while the content of secondaryαphase increases continuously when the solid solution temperature increases to the temperature of single-phase region.As the solution temperature increases,the tensile strength and yield strength of the alloy also increase,and the tensile strength increases from 545 MPa to 610 MPa.The yield strength increased from 440 MPa to 510 MPa.However,the elongation and cross-section shrinkage gradually decreased,and the elongation decreased from 35% to 18%.The reduction of area decreased from 55% to 37%.Compared with the tensile fracture morphology at room temperature,the dimple size in the tensile fracture at high temperature is significantly larger and the depth is deeper.

关 键 词：TC11钛合金 微观组织 高温拉伸性能 断口形貌 

分 类 号：TG166.5[金属学及工艺—热处理]