摘要
采用光学显微镜和扫描电镜研究TC11与TC17异质钛合金线性摩擦焊接头微观组织的特点。结果表明,在振幅为3mm、频率为40Hz、摩擦压力为66.7MPa、顶锻压力为80MPa、顶锻时间为30s的条件下,随着摩擦时间的延长,初生β相动态再结晶晶粒尺寸和α相片层宽度增加。在同一接头内部,接头表面的β相动态再结晶晶粒尺寸比接头中心大。此外,当摩擦时间较短(1～3s)时,在接头内有未焊合、微孔、裂纹缺陷存在。因此,应采用延长摩擦时间的方式来提高热输入,以获得良好的焊合接头。
Microstructures of linear friction welded TC11 and TC17 dissimilar titanium alloy joint are investigated by using optical microscopy (OPM) and scanning electron microscopy (SEM).The results show that prior-beta grain size and alpha plate width increase with friction time prolonging under the conditions of 3mm amplitude of oscillation,40Hz frequency of oscillation,66.7MPa friction pressure,80MPa forging force and 30s forging time.The prior-beta grain size at the surface of joint is bigger than that at the centre of joint for in a joint.Besides,defects such as lack of bonding,porosity and cracking in the joint exist at the relatively short friction time (1-3s).Therefore,the relatively long friction time is more preferable for obtaining a complete joint due to high heat input.
出处
《航空制造技术》
2011年第16期81-85,共5页
Aeronautical Manufacturing Technology
关键词
钛合金
线性摩擦焊
微观组织
缺陷
Titanium alloy Linear friction welding Microstructure Defect
