Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy

作     者：Wei Long Song Zhang Yi-long Liang Mei-gui Ou Wei Long;Song Zhang;Yi-long Liang;Mei-gui Ou

作者机构：College of Materials and MetallurgyGuizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of Guizhou provinceGuizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing TechnologyGuizhou UniversityGuiyang 550025China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2021年第28卷第2期

页      面：296-304页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0806[工学-冶金工程] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 080201[工学-机械制造及其自动化] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：This work was financially supported by the Guizhou Science and Technology Fund Project(Nos.1027,2165,and6013) the Engineering Research Center Project from Guizhou Provincial Education Department,China(No.016). 

主　　题：multi-stage heat treatment titanium alloy in-situ tension microstructure mechanical properties 

摘      要：Duplex-structured TC21 alloy samples were first solution-treated at a higher temperature in theα+βregion(940°C)with furnace cooling(FC),air cooling(AC),and water cooling(WC),followed by a second-stage solution treatment at a lower temperature in theα+βregion(900°C),and then finally aged at 590°C.The effects of the morphology and quantity ofαphases on the structure and properties of the TC21 alloy after the different heat treatments were analyzed.The in-situ tensile deformation process and crack propagation behavior were observed using scanning electron microscopy(SEM).The quantity of equiaxedαphases as well as the thickness of lamellarαphases reduced,the tensile strength increased firstly and then decreased,the elongation decreased with the increasing cooling rate after the first-stage solution treatment.The amount and size of lamellarαphases increased after the second-stage solution treatment because of sufficient diffusion of the alloying elements,thereby leading to increased tensile strength.The amount of dispersedαphases increased after the third-stage aging treatment owing to the increase in the nucleation rate,resulting in a noteworthy strengthening effect.After the third-stage aging treatment,the first-stage FC sample exhibited better mechanical properties because it contained more equiaxedαandβtrans phases than the first-stage AC and WC samples.