The microstructural observation and wettability study of brazing Ti-6Al-4V and 304 stainless steel using three braze alloys

摘要: Both Ti-6Al-4V and 304 stainless steels (304SS) are good engineering alloys widely used in industry due to their excellent mechanical properties as well corrosion resistance. Well-developed joining process can not only promote the application of these alloys, but also provide designers versatile choices alloys. Brazing is one most popular methods dissimilar In this study, three-selected silver base filler including Braze 580, BAg-8 Ticusil®, vacuum brazing 304SS Ti-6Al-4V. Based upon dynamic sessile drop test, 580 has lowest temperature 840°C, contrast 870°C for 900°C Ticusil® braze alloy. No phase separation observed all brazes on substrate. However, specimens brazed above 860°C The continuous reaction layer between mainly comprised Ti, Fe Cu. thickness at 580/Ti-6Al-4V interface much larger than that 580/304SS interface. Meanwhile, a Cu-Sn-Ti ternary intermetallic compound found joint have similar interfacial microstructures. Different from specimen, there thick Cu-Ti-Fe both BAg-8/304SS Ticusil®/304SS interfaces. formation prohibit wetting molten Ti2Cu TiCu layers Ti-6Al-4V/BAg-8 Ti-6Al-4V/Ticusil®