TC4-DT合金通过三重热处理得到的三态组织  

Tri-modal Structure of TC4-DT Alloy through Triple Heat Treatment

作　　者：张贵华[1] 董洪波[1] 朱深亮 刘诚[1] 余新平[1] 

机构地区：[1]南昌航空大学,江西南昌330063

出　　处：《稀有金属材料与工程》2016年第9期2454-2457,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51164029)

摘　　要：研究了钛合金TC4-DT在高温热变形后进行的三重热处理对微观组织的影响。结果表明：三重热处理工艺中第一重温度与第二重温度影响着合金组织中的等轴α相的含量,伴随着第一重温度与第二重温度的升高,等轴α相含量逐渐减少;将高温变形后的组织通过940℃/1 h,WQ＋920℃/1 h,WQ＋820℃/1.5 h,AC热处理可以得到三态组织,其中约含20%等轴α、50%～60%条状α构成的网篮和β转变基体;且条状α相构成的网篮中,一次次生条状α相间还含有更细小二次次生条状α相,这种组织具有较小的纵横比,各α集束交错排列,细化了组织。The effect of triple heat treatment on microstructure of TC4-DT titanium alloy was studied after thermal deformation at high temperature. It is shown that the first temperature and the second temperature in the triple heat treatment influence the amount of α phase in alloy microstructure; moreover, with the increasing of the first temperature and the second temperature, equiaxed α phase gradually deceases. The tri-modal structure which results from 940 ℃/1 h, WQ＋920 ℃/1 h, WQ＋820 ℃/1.5 h, AC, consists of about 20% equiaxed α, 50%～60% basketweave composed of strip α and transformed β matrix. Furthermore, there are smaller secondary strip α among first strip α in the basketweave composed of strip α. The microstructure has a smaller aspect ratio and α staggered clusters, refining the microstructure.

关 键 词：TC4-DT钛合金 三态组织 三重热处理 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG166.5[金属学及工艺—金属材料]