退火温度对TC11钛合金组织与拉伸性能的影响  

Impact of annealing temperature on the microstructure and tensile properties of TC11 titanium alloy

作　　者：马雪芳 张明玉 陈雅娟 MA Xuefang;ZHANG Mingyu;CHEN Yajuan(Xinjiang Xiangrun New Materials Technology Co.,Ltd.,Hami,Xinjiang 839000,China)

机构地区：[1]新疆湘润新材料科技有限公司,新疆哈密839000

出　　处：《轨道交通材料》2025年第1期32-35,共4页Materials for Rail Transportation System

基　　金：自治区重点研发计划项目(2022B01029)。

摘　　要：选取TC11钛合金作为研究材料,设置两相温度(940℃、960℃、980℃)以及单相区温度(1000℃)对该合金进行退火处理,深入研究合金经单相区温度退火处理的微观组织与拉伸性能。研究发现:在退火温度由两相区升高至单相区的过程中,次生α相的含量不断增多,但同时初生α相含量减少并消失,合金抗拉强度由992 MPa增至1128 MPa,而断后伸长率则由21%降低至2%。合金经低温(940℃、960℃)退火处理后的断口形貌主要由大量的韧窝形貌构成,且伴有局部解离小平面,而经高温(960℃、1000℃)退火处理后的断口出现了清晰的解理台阶与撕裂棱形貌,断口形貌转变为岩石状。TC11 titanium alloy is selected as the research object,and is annealed at two-phase temperatures(940℃,960℃,980℃)and single-phase temperature(1000℃)to investigate its microstructure and tensile properties after the annealing treatment at single-phase temperature.The research results show that the content of secondaryαphase increases,but the content of primaryαphase decreases and gradually disappears when the annealing temperature increases from two-phase zone to single-phase zone,the ten⁃sile strength of the alloy increases from 992 MPa to 1128 MPa,and the elongation after fracture decreases from 21%to 2%.After an⁃nealing at low temperature(940℃,960℃),the fracture morphology of the alloy is mainly composed of a large number of dimples with local dissociation facet,while its fracture exhibits clear cleavage table and tear edge morphology,transformed into rocklike appear⁃ance after annealing at high temperature(960℃,1000℃).

关 键 词：退火温度 TC11钛合金 显微组织 拉伸性能 断口微观形貌 

分 类 号：U270.4[机械工程—车辆工程] TG156.2[交通运输工程—载运工具运用工程]