退火温度对TC6合金微观组织和力学性能的影响  

Influence of annealing temperature on microstructure and mechanical properties of TC6 alloy

作　　者：张晓园[1] 李少强[1] 刘凯凯 杜予晅[1] 雷锦文[1] 王晓亮[1] 

机构地区：[1]西部超导材料科技股份有限公司陕西省航空材料工程实验室,陕西西安710018

出　　处：《金属热处理》2017年第10期112-115,共4页Heat Treatment of Metals

摘　　要：研究了在普通退火和等温退火时,不同退火温度下TC6合金的微观组织演变过程及力学性能变化规律。结果表明:普通退火中随退火温度的升高,微观组织中细小的次生α相逐渐溶入基体相而消失,粗大的次生α相继续长大;最后发生再结晶,形成新的β晶粒在其内部析出新的针状组织。这一过程中合金室温强度呈抛物线形变化,并在850℃和870℃附近达到最大值约1090 MPa。等温退火中随退火温度的升高,微观组织中次生α相发生等轴化,由片层组织长大为等轴α相;并随退火温度的升高,等轴α相尺寸显著增加。这一过程中合金室温强度呈台阶式降低,当温度在850℃和870℃时,室温强度达到最大值约1000 MPa。The microstructure evolution and tensile properties of TC6 alloy were studied at different annealing temperature in heat treatment.The experimental results show that,with the increasing of common annealing temperature,small secondary α phase dissolves into the matrix gradually and disappears,coarse secondary α phase continues to grow and recrystallize. In this process,the strength of the alloy at room temperature shows a parabolic shape,and reaches the maximum value of 1090 MPa nearby 850 ℃ and 870 ℃. With the increasing of isothermal annealing temperature,the secondary α phase transforms into equiaxed α phase and grows up gradually. In this process,the strength of the alloy at room temperature reduces in the form of steps,and reaches the maximum value of 1000 MPa nearby 850 ℃ and 870 ℃.

关 键 词：TC6合金 普通退火 等温退火 微观组织 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]