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为了解决性质活泼的Ti Al合金钎焊过程中界面金属间化合物厚大的问题,对Ti、Al、Ag的三元相图进行了分析,设计了特别的工艺方法。该方法有悖于传统钎焊工艺,在钎料熔化初期设置了一个保温段,在该保温段有初生的、致密性较差的金属间化合物生成;由于钎料中Ag元素向母材中的扩散形成新液相,在浓度梯度、热扰动等作用下初生的金属间化合物破碎并被推向焊缝内部,从而获得金属间化合物颗粒弥散分布的焊缝。为了验证上述工艺可行性,在1033~1173 K、100~300 s参数范围内对Ti Al合金与42Cr Mo钢进行了真空扩散钎焊。采用光学显微镜、扫描电镜和能谱分析等方法对界面组织进行了分析。结果表明,采用特殊工艺方法对Ti Al合金与42Cr Mo钢进行钎焊,可以获得金属间化合物颗粒弥散分布的焊缝。
In order to solve the problem of thick interface intermetallic compounds during the brazing process of the active TiAl alloy, the ternary phase diagrams of Ti, Al and Ag were analyzed and a special process was designed. The method is contrary to the traditional brazing process, in the initial melting of the solder is provided with a holding section, in the insulation section of newborn, less dense intermetallic compounds generated; due to the brazing filler metal Ag Diffusion to form a new liquid phase, in the concentration gradient, thermal disturbances under the action of new intermetallic compounds broken and pushed into the weld inside, so as to obtain intermetallic particles dispersed distribution of the weld. In order to verify the feasibility of the above process, TiAl alloy and 42Cr Mo steel were brazed by vacuum diffusion in the range of 1033 ~ 1173 K and 100 ~ 300 s. The interface microstructure was analyzed by optical microscopy, scanning electron microscopy and energy spectrum analysis. The results show that the weld of Ti-Al alloy and 42Cr-Mo steel can be obtained by special process.