TC4钛合金β热处理的显微组织演变  

Microstructure Evolution of TC4 Titanium AlloyβHeat Treatment

作　　者：李昌 任伟宁 杨健 李秀琼 欧阳文博 李倩 程法嵩 LI Chang;REN Weining;YANG Jian;LI Xiuqing;OUYANG Wenbo;LI Qian;CHENG Fasong(AECC Guizhou Liyang Aero-Engine Co.,Ltd.,Guiyang 550014,China;Western Titanium Technologies Co.,Ltd.,Xi'an 710201,China)

机构地区：[1]中国航发贵州黎阳航空动力有限公司,贵州贵阳550014 [2]西部钛业有限责任公司,陕西西安710201

出　　处：《热加工工艺》2024年第10期151-154,共4页Hot Working Technology

基　　金：陕西省关键核心技术产业化“揭榜挂帅”项目(2022);陕西省秦创原“科学家+工程师”队伍建设项目(2023KXJ-272)。

摘　　要：采用β单相区热处理+α-β相区单重/双重热处理相结合的热处理制度对TC4钛合金板材试样进行处理,获得α束域相互交错、条状α相长宽比适中的网篮组织。结果表明,β相区高温固溶热处理后,随着固溶冷却速率的增加,显微组织由魏氏组织变为针状马氏体。随后的α-β相区单重/双重热处理结果表明,1020℃/1 h,AC+960℃/1 h,FC+900℃/1 h,AC三重热处理可以获得α片层尺寸相对均匀,α束域相互交错的网篮组织;而1020℃/1 h,WQ+960℃/1 h,FC+900℃/1 h,AC可以获得较高显微硬度的组织。TC4 titanium alloy plate sample was treated throughβsingle phase zone heat treatment andα-βsingle/double heat treatment to obtain basket-weave microstructure with the staggeredαbeam domains and the stripαphase with moderate aspect ratio.The results show that the microstructure transforms from widmanstatten structure to acicular martensite structure with the increase of solution cooling rate after the high temperature solution heat treatment inβphase zone.Subsequent results ofα-βsingle/double heat treatment demonstrate that the basket-weave microstructure with staggeredαbeam domains and relatively uniformαlamellar can be achieved via 1020℃/1 h,AC,960℃/1 h,FC and 900℃/1 h,AC triple heat treatment.And the high micro-hardness structure can be obtained by 1020℃/1 h,WQ,960℃/1 h,FC and 900℃/1 h,AC heat treatment.

关 键 词：TC4钛合金 魏氏组织 β转变组织 α片层组织 显微硬度 

分 类 号：TG166.5[金属学及工艺—热处理]