固溶温度对TC21钛合金微观组织与力学性能的影响  

Effects of Solution Temperature on Microstructure and Mechanical Properties of TC21 Titanium Alloy

作　　者：翟欣姣 张明玉 宋一新 岳旭 同晓乐 ZHAI Xinjiao;ZHANG Mingyu;SONG Yixin;YUE Xu;TONG Xiaole(Xinjiang Xiangrun New Materials Technology Co.,Ltd.,Hami 839000;Engineering Research Center of Continuous Extrusion,Dalian Jiaotong University,Dalian 116028;Shichangxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016)

机构地区：[1]新疆湘润新材料科技有限公司,哈密839000 [2]大连交通大学材料科学与工程学院,大连116028 [3]中国科学院金属研究所,师昌绪先进材料创新中心,沈阳110016

出　　处：《特种铸造及有色合金》2024年第11期1554-1558,共5页Special Casting & Nonferrous Alloys

基　　金：自治区重点研发计划资助项目(2022B01029);自治区创新环境(人才、基地)建设专项—天山创新团队计划资助项目(2020D14041)。

摘　　要：以TC21钛合金为研究对象,根据合金的相变点分别设置两相区与单相区温度对合金进行固溶处理,通过微观形貌观察、物相分析、拉伸性能以及断口分析等研究了固溶温度对TC21钛合金微观组织与力学性能的影响。结果表明,固溶温度对合金的微观组织形貌的影响较大,在固溶温度升高的过程中,组织中的初生α相数量逐渐减少,最后完全消失,形貌由长条状向短棒状改变,且等轴化程度逐渐增加。合金的强度随固溶温度升高呈现出先升高再降低的趋势,而塑性则呈现出持续降低的趋势。当固溶温度处于两相区时,合金的拉伸断口形貌以韧窝为主,其断裂形式为韧性断裂;当固溶温度处于单相区时,合金的拉伸断口形貌则以岩石状形貌为主,并存在少量尺寸较小的韧窝,断裂形式为脆性断裂。Taking TC21 titanium alloy as object,the temperatures of two-phase region and single-phase region were set for solid solution treatment according to the phase transition point.Effects of solid solution temperature on microstructure and mechanical properties of TC21 titanium alloy were investigated by means of microstructure observation,phase analysis,tensile property and fracture analysis.The results indicate that the solution temperature has a great influence on the microstructure of alloy.During the increasing process of solution temperature,the quantities of primary α phase in the microstructure are gradually decreased,and finally disappears completely.The morphology is transformed from long strip to short rod,and the degree of equiaxiallization is gradually enhanced.The strength of alloy presents a trend of rising firstly and then decreasing with the increase of solution temperature,while the plasticity is decreased continuously.Within two-phase region of temperature,the tensile fracture morphology is dominated by dimples,and the fracture type is characterized by ductile fracture.Within single-phase region of temperature,the tensile fracture morphology is dominated by rock-like shape with a small number of small-sized dimples,and the fracture type is characterized by brittle fracture.

关 键 词：TC21钛合金 微观组织 拉伸性能 断口微观形貌 

分 类 号：TG156.1[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]