The knowledge of alloy–process–structure–property relationships is of particular interest for several safety-critical brazed components and requires a detailed characterization. Thus, three different nickel-based brazing filler metals were produced with varying chromium and molybdenum content and were used to braze butt joints of the austenitic stainless steel AISI 304L under vacuum. Two holding times were used to evaluate diffusion-related differences, resulting in six specimen variations. Significant microstructural changes due to the formation and location of borides and silicides were demonstrated. Using X-ray diffraction, alloy-dependent residual stress gradients from the brazing seam to the base material were determined and the thermal-induced residual stresses were shown through simulations. For mechanical characterization, impact tests were carried out to determine the impact toughness, as well as tensile tests at low and high strain rates to evaluate the strain-rate-dependent tensile strength of the brazed joints. Further thermal, electrical, and magnetic measurements enabled an understanding of the deformation mechanisms. The negative influence of brittle phases in the seam center could be quantified and showed the most significant effects under impact loading. Fractographic investigations subsequently enabled an enhanced understanding of the fracture mechanisms.

中文翻译：

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NiCrSiB钎料钎焊AISI 304L接头的微观结构，残余应力和应变率相关的变形和断裂行为

合金，工艺，结构，性能之间的关系知识对于几种安全性至关重要的钎焊组件尤为重要，并且需要进行详细的特性描述。因此，生产了三种不同的镍和铬含量不同的镍基钎料，并用于在真空下钎焊奥氏体不锈钢AISI 304L的对接接头。使用两个保持时间来评估与扩散相关的差异，从而导致六个样本变化。结果表明，由于硼化物和硅化物的形成和位置，显微组织发生了显着变化。使用X射线衍射，确定了从焊缝到基材的合金相关残余应力梯度，并通过模拟显示了热诱导残余应力。为了进行机械表征，进行冲击试验以确定冲击韧性，并在低应变率和高应变率下进行拉伸试验，以评估钎焊接头的应变率相关拉伸强度。进一步的热，电和磁测量使您能够了解变形机理。可以量化脆性相在接缝中心的负面影响，并显示冲击载荷下最显着的影响。分形研究随后使人们对断裂机理有了更深入的了解。可以量化脆性相在接缝中心的负面影响，并显示冲击载荷下最显着的影响。分形研究随后使人们对断裂机理有了更深入的了解。可以量化脆性相在接缝中心的负面影响，并显示冲击载荷下最显着的影响。分形研究随后使人们对断裂机理有了更深入的了解。