热处理工艺对电子束熔丝成形TC18钛合金组织性能的影响  

Effect of heat treatment on microstructure and property of TC18 titanium alloy prepared by electron beam rapid manufacturing

作　　者：黄志涛[1] 锁红波[1] 杨光[1] 杨帆[1] 董伟[1] 

机构地区：[1]北京航空制造工程研究所高能束流加工技术重点实验室,北京100024

出　　处：《材料热处理学报》2015年第12期50-54,共5页Transactions of Materials and Heat Treatment

基　　金：国家预研基金(51318030203)

摘　　要：利用电子束熔丝成形技术制备了TC18钛合金试样,研究了热处理工艺对TC18钛合金显微组织性能的影响。结果表明,经热等静压处理后,宏观组织为典型的沿堆积高度方向生长的粗大β柱状晶;β晶粒内部显微组织具有网篮状组织特征;片层状初生α相随着固溶温度升高而逐渐减少,固溶温度为830℃时全部消失;随固溶温度的升高,试样对应的显微硬度值增大;相同固溶处理条件下,随时效温度的升高,β转变组织中次生α相片层宽度明显增大,对应的显微硬度值降低。Samples of TC18 titanium alloy were prepared by electron beam rapid manufacturing（ EBRM） method. Effect of heat treatment processes on microstructure of the tested alloy was investigated. The results show that after hot isostatic pressing（ HIP） treatment,the sample exhibits large columnar β grains growing epitaxially along the height direction of deposits. The microstructure of β grains is characterized by basketweave microstructure. The volume fraction of primary α phase decreases with the increasing of solution temperature and disappears when the solution temperature reaches up to 830 ℃. The microhardness of EBRM TC18 alloy increases with increasing solution temperature. In the same solid-solution treatment,the secondary α laths are coarsening and microhardness is decreasing when the aging temperature increases from 500 ℃ to 600 ℃.

关 键 词：TC18钛合金 电子束熔丝成形 热处理 显微组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]