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首页> 外文期刊>Materials Science and Engineering >Effect of post-bond heat treatment on microstructural evolution and mechanical properties of brazed ultrathin-walled structure
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Effect of post-bond heat treatment on microstructural evolution and mechanical properties of brazed ultrathin-walled structure

机译：粘结后热处理对钎焊超薄壁结构微观组织演变和力学性能的影响

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摘要

A nickel-based superalloy Inconel 718 ultrathin-walled structure was manufactured by high-temperature brazing using Ni-Cr-Si filler metal. The microstructure in the brazed fillet was analysed, and the solidification behaviour and the formation of the eutectic island in the brazed fillet were investigated. The effects of post-bond heat treatment (PBHT) with different temperatures and durations on the microstructural evolution and mechanical properties of the brazed ultrathin-walled structure were investigated in detail. The results indicate that PBHT at a relatively high temperature significantly affects the mechanical properties of the ultrathin-walled structure, which is attributed to the formation of the precipitates at a deeper location in the base metal. In addition, the mechanical performance is enhanced by the generation of delta- and gamma"-phases under relatively low temperatures (980 degrees C and 740 degrees C). On the other hand, the decrease in mechanical performance is caused by the formation of network-like precipitates and the Ni-Si-Nb phase at the grain boundary over extended ageing times. By analysing the fracture mode evolution and the propagation of cracks in the brazing fillet, the effect of PBHT on fracture morphology evolution is determined primarily by the proportion of brittle fractures and the formation of the strengthening phase in the base metal.
机译：通过使用Ni-Cr-Si填充金属的高温钎焊来制造镍基超合金Inconel 718超薄壁结构。分析了钎焊圆角的微观结构，研究了钎焊圆角的凝固行为和共晶岛的形成。详细研究了不同温度和持续时间的键合后热处理（PBHT）对钎焊超薄壁结构的微观组织演变和力学性能的影响。结果表明，较高温度下的PBHT会显着影响超薄壁结构的机械性能，这归因于在贱金属中更深处形成沉淀。此外，在相对较低的温度（980摄氏度和740摄氏度）下产生δ相和γ相会增强机械性能。另一方面，机械性能的下降是由于形成了时效时间延长后，晶界处出现网状析出物和Ni-Si-Nb相，通过分析钎焊圆角处的断裂模式演变和裂纹扩展，主要由PBHT决定了PBHT对断裂形态演变的影响。脆性断裂的比例和母材中强化相的形成。

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