加热时间对钛合金热自压连接接头组织和性能的影响

发布时间：2019-01-26 16:35

【摘要】：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。
[Abstract]:The interface of titanium alloy joints with rigid restraint thermal compression was observed by optical microscope, back scattering electron diffraction analysis and tensile mechanical properties test. The effects of heating time on the interface defects, microstructure and mechanical properties of the joint were analyzed. At the same time, the thermal stress-strain evolution process in the connection is analyzed by using the thermoelastic-plastic finite element model, and the reasons for the influence of heating time on the bonding quality, microstructure and mechanical properties of the joint interface are explained. The results show that, with the increase of heating time, the existence time of high temperature, the time of compressive stress and the transverse compression plastic deformation increase with the increase of heating peak temperature, which promote the diffusion of atoms on both sides of the interface. The joint mechanical properties are improved because of the reduction of the defects in the interface. When the heating time is more than 300 s, the solids bonding joints with good interface bonding quality, uniform microstructure and excellent mechanical properties can be obtained.
【作者单位】：北京航空航天大学;北京航空制造工程研究所高能束流加工技术重点实验室;
【基金】：国家自然科学基金(50935008)
【分类号】：TG146.23;TG306

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