摘要
采用扫描电镜(SEM)和金相显微镜(OM)研究了固溶热处理对Ti6Al4V ELI钛合金显微组织的演变规律,以及显微组织对力学性能的影响关系,结果表明:随着固溶温度的升高,Ti6Al4V ELI钛合金初生α_(p)相含量降低,片层α相厚度和β晶粒尺寸均增加;钛合金强度和塑性均随着固溶温度的升高而降低,在952℃固溶后时效,抗拉强度可达915 MPa,延伸率16.8%,断裂韧性仅为84 MPa·m^(1/2);在997℃进行固溶后时效,钛合金抗拉强度降低至861 MPa,延伸率9.6%,断裂韧性达115 MPa·m^(1/2)。在952℃进行固溶,Ti6Al4V ELI钛合金为韧性断裂,提高固溶温度后合金呈韧脆混合型断裂。
The scanning electron microscope(SEM)and optical microscope(OM)were employed to investigate the influence of solution treatment on microstructure evolution of Ti6Al4V ELI titanium alloy,and the relationship between microstructure and mechanical properties were discussed.The results show that the content of the primaryα_(p) phase of Ti6Al4V ELI titanium alloy decreases,and the thickness of lamellarαphase andβgrain size increase with the increase of solution treatment temperature.The strength and plasticity of Ti6Al4V ELI titanium alloy decrease with the increase of solution temperature.When the solution treatment is 952℃,the tensile strength,elongation and fracture toughness values of Ti6Al4V ELI titanium alloy are 915 MPa,16.8%and 84 MPa·m^(1/2),respectively.At the solution treatment up to 997℃,the tensile strength and elongation values decrease to 861 MPa and 9.4%,respectively,but the fracture toughness increases to 115 MPa·m^(1/2).It shows a ductile fracture with solution treatment at 952℃while ductile-brittle mixed fracture as the temperature increases.
作者
冉兴
王哲
李海宾
吕志刚
李培杰
Ran Xing;Wang Zhe;Li Haibin;Lv Zhigang;Li Peijie(Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;AVIC Heavy Machinery Co.,Ltd.,Guiyang 550005,Guizhou,China;Shaanxi Hongyuan Aviation Forging Co.,Ltd.,Xianyang 713801,Shaanxi,China;AVIC Tiandi Laser Technology Co.,Ltd,Beijing 102209,China)
出处
《钢铁钒钛》
CAS
北大核心
2021年第6期66-71,共6页
Iron Steel Vanadium Titanium
基金
国家两机重大专项基础研究(J2019-Ⅶ-002)。
