论文部分内容阅读
对不同加热时间下获得的钛合金刚性拘束热自压连接接头进行了连接界面的光学显微镜观察,背散射电子衍射组织分析和接头拉伸力学性能测试,分析了加热时间对连接接头界面缺陷、组织和力学性能的影响。同时,利用热弹塑性有限元模型分析了连接中热应力应变演变过程,阐明了加热时间对连接接头界面焊合质量、组织和力学性能影响的原因。结果表明:在加热峰值温度相当的情况下,随加热时间增加,界面金属高温存在时间和受压应力作用时间以及横向压缩塑性变形增加,促进界面两侧原子扩散,界面未焊合缺陷减少,接头综合力学性能提高。加热时间至300s以上时,可以获得界面焊合质量好,组织均匀,综合力学性能优异的固相连接接头。
The microstructures of the rigid confined hot-pressed self-compression titanium alloy joints under different heating time were observed by optical microscopy, backscattered electron diffraction microstructure and tensile mechanical properties of the joints. The effects of heating time on the interface defects, And mechanical properties. At the same time, the thermo-elasto-plastic finite element model was used to analyze the evolution process of thermal stress and strain during the connection, and the reasons for the influence of heating time on the welding quality, microstructure and mechanical properties of the joint were clarified. The results show that with the increase of heating time, the existence time of high temperature metal interface, the time of compressive stress and the plastic deformation of transverse compression increase with the increase of heating time, which promotes the diffusion of atoms on both sides of interface and the decrease of unwelded defects at the interface. Comprehensive mechanical properties improve. Heating time to 300s or more, you can get a good interface welding quality, uniform organization, excellent mechanical properties of solid-state connectors.