热处理对Ti40阻燃钛合金热稳定性能的影响  

Effect of Heat Treatment on Thermal Stability of Ti40 Alloy

作　　者：赵永庆[1] 辛社伟[1] 吴欢[1] 杨海瑛[1] 李倩[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第4期660-664,共5页Rare Metal Materials and Engineering

基　　金：国家重点项目(MKPT-01-101(2D));国家“973”项目(2007CB613805)

摘　　要：针对Ti40合金,设计了5种热处理工艺,并将5种工艺归为3类:中温退火、高温淬火+预时效+时效及高温退火+中温退火+时效。分别测试了Ti40合金在3类热处理工艺下的室温力学性能及500℃、550℃热暴露100h的热稳定性能,并分析了合金的微观组织。结果表明,不同的热处理工艺下,合金室温力学性能相差不大,而热稳定性能变化较大;直接中低温退火后合金的热稳定性能最好,其原因主要是由于中低温退火后,合金组织中保留一部分锻造的高密度位错等缺陷,并且晶界曲折不平,这使得在热暴露过程中,单位晶界析出物的数量减少,弱化了晶界析出物对合金热稳定性能的不利影响。Five heat treatment technologies for Ti40 alloy are designed,which divided into three types. The first is annealing at medium temperature; the second is water quenching and followed by pre-ageing and ageing; the third is annealing at high temperature and followed by annealing at medium temperature and ageing. The microstructures and mechanical properties of Ti40 alloy after different heat treatments and thermal exposure at 500, 550℃ for 100 h were tested. The results indicate that the mechanical properties of Ti40 alloy at room-temperature after all the five heat treatments are not different, while the thermal stability has sharp difference. Among the three types of heat treatment technologies, the best thermal stability of the alloy is achieved after the first type of the heat treatment. After annealing at medium temperature, some defects and uneven grain boundaries are remained, which leads to the reduction fractions of precipitation within unit grain boundary and the harmful effect of precipitations on grain boundary to be weakened.

关 键 词：TI40阻燃钛合金 热处理 热稳定 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]