论文部分内容阅读
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 mechanical properties of TC6 alloy at different annealing temperatures during normal annealing and isothermal annealing were studied. The results show that with the increase of annealing temperature in ordinary annealing, the fine secondary α phase gradually dissolves into the matrix phase and disappears in the microstructure, while the coarse secondary α phase continues to grow up. Finally, recrystallization occurs to form new β crystal The grain precipitates new acicular tissue within it. During this process, the room temperature strength of the alloy showed a parabolic change and reached a maximum of about 1090 MPa at 850 ° C and 870 ° C. In the isothermal annealing, with the increase of the annealing temperature, the secondary α phase in the microstructure is equiaxed and the lamellar structure grows into the equiaxed α phase. With the increase of the annealing temperature, the equiaxed α phase size increases significantly. During this process, the room temperature strength of the alloy decreased stepwise. When the temperature was at 850 ° C and 870 ° C, the room temperature strength reached a maximum of about 1000 MPa.