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首页> 外文学位 >Microstructure-mechanical property relationships in transient liquid phase bonded nickel-based superalloys and iron-based ODS alloys.
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Microstructure-mechanical property relationships in transient liquid phase bonded nickel-based superalloys and iron-based ODS alloys.

机译：瞬态液相键合镍基高温合金和铁基ODS合金的微观结构-机械性能关系。

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The research work presented here discusses the microstructure-mechanical property relationships in wide gap transient liquid phase (TLP) bonds, between the single crystal nickel-base superalloy CMSX-4 and two polycrystalline superalloys, IN 738 and IN 939, using wide-gap style composite interlayers. Fabrication of complicated geometries and successful repair development of gas turbine engine components made of superalloys requires a high performance metallurgical joining technique and a complete understanding of microstructure-mechanical property relationships. A number of joining processes have been investigated, but all of them have significant disadvantages that limit their ability to produce sound joints. TLP bonding has proved to be a successful method and is the most preferred joining method for nickel-based superalloys, with microstructures and compositions of the joint similar to that of the bulk substrates resulting in mechanical properties close to that of the parent metal.; The current joining process used two proprietary wide-gap style composite interlayers, Niflex-110 and Niflex-115, consisting of a nickel-based core with boron-rich surfaces, and a conventional rapidly solidified metallic glass foil interlayer BNi-3 was chosen for comparison. When composite interlayers were employed, competition between wetting of the faying surfaces and formation of the eutectic along the grain boundaries was observed to lead to non-bonded regions at the faying surfaces, unless a boron-rich interlayer was employed. Composite interlayers resulted in the suppression of bondline boride formation. With the exception of this competition, adequate wetting of the substrates occurred for all interlayers.; Two factors dominated the room temperature mechanical properties of the wide-gap bonds. The first was the extent of gamma-prime formation at the bondline. Results from shear testing and fractography of the bonds indicated ductile shear failure at the bondline. This was due to the formation of insufficient gamma-prime within the joint, which left a relatively soft bondline region. The second factor was the presence of second phases in the diffusion zone of the polycrystalline substrate. This led to the formation of brittle secondary cracks. Overall, it is evident that the room temperature shear strength of the bonds was more dependent on the extent of formation of gamma' on the bondline than on the secondary phases in the diffusion zone of the polycrystalline substrate.
机译：本文介绍的研究工作以宽间隙形式讨论了单晶镍基高温合金CMSX-4与两种多晶高温合金IN 738和IN 939之间的宽间隙瞬态液相（TLP）键中的微观结构-机械性能关系。复合中间层。复杂几何形状的制造以及由超级合金制成的燃气涡轮发动机部件的成功维修开发需要高性能的冶金连接技术以及对微观结构与机械性能关系的全面理解。已经研究了许多连接过程，但是所有这些过程都具有明显的缺点，这些缺点限制了它们产生良好接头的能力。 TLP结合已被证明是一种成功的方法，并且是镍基高温合金最优选的结合方法，其结合部的微观结构和组成类似于块状基材的结合部，其机械性能接近母体金属。当前的连接过程使用了两个专有的宽间隙型复合中间层Niflex-110和Niflex-115，它们由具有富硼表面的镍基芯组成，并且选择了常规的快速固化金属玻璃箔中间层BNi-3比较。当使用复合夹层时，除非使用富硼夹层，否则观察到粘结表面的润湿与沿晶界形成共晶之间的竞争会导致粘结表面处的非粘结区域。复合中间层导致粘结线硼化物形成的抑制。除了这种竞争之外，所有中间层都充分浸湿了基材。宽间隙键的室温机械性能主要由两个因素决定。首先是在结合线上形成γ-底漆的程度。结合物的剪切测试和分形术的结果表明，在结合线上发生了延性剪切破坏。这是由于在关节内形成的γ-底漆不足，从而留下了相对较软的粘合层区域。第二个因素是在多晶衬底的扩散区中存在第二相。这导致了脆性二次裂纹的形成。总的来说，很明显，键的室温剪切强度更依赖于键合线上的γ'的形成程度，而不是取决于多晶衬底扩散区中的第二相。

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