In brazing, the choice of base metal, brazing filler metal (BFM), and braze process conditions involves complex tradeoffs among cost, mechanical strength, corrosion resistance, and others. In this work, the tradeoff between strength and corrosion resistance of 316L stainless steel joints brazed with a newer “very corrosion-resistant” Ni-Cr-P-Mo-Si BFM and a more established “corrosion-resistant” Ni-Cr-Si-B BFM is quantitatively analyzed. Corrosion tests and microstructural analyses were performed using common practices. Joint strength was evaluated by testing brazed single-lap joints (SLJs) in tension following standardized procedures. However, conventional interpretations were found to be inadequate for quantitative comparisons. Therefore, the SLJ stress state was analyzed in detail and a complete interpretation was developed. Joint strength is shown to be determined by the SLJ geometry, base metal properties, and braze microstructure. This analysis was used to explain the occurrence of different failure modes (fast fracture, peeling, and base metal failure) and to make suggestions for improved methods for conducting and analyzing brazed SLJ tensile tests. The newer BFM is shown to provide significantly better corrosion resistance for a moderate reduction in mechanical strength.

在钎焊中，母材、钎料 (BFM) 和钎焊工艺条件的选择涉及成本、机械强度、耐腐蚀性等之间的复杂权衡。在这项工作中，使用更新的“非常耐腐蚀”Ni-Cr-P-Mo-Si BFM 和更成熟的“耐腐蚀”Ni-Cr-Si 钎焊 316L 不锈钢接头的强度和耐腐蚀性之间的权衡-B BFM 被定量分析。腐蚀测试和微观结构分析是使用常见的做法进行的。接头强度是通过按照标准化程序在张力下测试钎焊单搭接接头 (SLJ) 来评估的。然而，发现传统解释不足以进行定量比较。因此，对 SLJ 应力状态进行了详细分析，并进行了完整的解释。接头强度由 SLJ 几何形状、母材特性和钎焊微观结构决定。该分析用于解释不同失效模式（快速断裂、剥离和母材失效）的发生，并为改进和分析钎焊 SLJ 拉伸试验的方法提出建议。较新的 BFM 显示出显着更好的耐腐蚀性能，但机械强度适度降低。