Effect of alloying elements on the isothermal solidification during TLP bonding of SS 410 and SS 321 using a BNi-2 interlayer

Interface structure and mechanical properties of Ti(C,N)-based cermet and 17-4PH stainless steel joint brazed with nickel-base filler metal BNi-2

“…It has been reported that boron in the filler metal readily diffused into the base metal (Shiue et al, 2002;Arafin et al, 2007) and apparently, if the brazing temperature was low, there would be a certain amount of boron left in the brazing seam, forming the brittle phases at room temperature. The brittle phases formed in the brazing seam at 1050 • C were caused by the following two reasons.…”

Microstructural Evolution and Bonding Behavior during Transient Liquid-Phase Bonding of a Duplex Stainless Steel using two Different Ni-B-Based Filler Materials

“…The ejection of B into adjacent melt because of low solubility of B in Ni (0.3 at. pct [15,[21][22][23][24][25][26][27] presented in Table IV) and the partition coefficient of B in Ni (~0.008, based on the Ni-B binary phase diagram [22,27] ) shifts the melt composition toward the eutectic composition. The enrichment of B and the formation of Ni 3 B lead to an increase in B concentration in the ASZ.…”

“…pct). [15,[21][22][23][24][25][26][27] Thus, at the higher bonding temperature used in the present work, on the one hand, the solubility of the melting point depressant B in the ISZ is decreased (i.e., C aL is decreased), as shown in Figure 18(b), owing to more diffusion of the base alloying elements, particularly Fe, from the substrate into the interlayer. In addition, according to the Ni-B phase diagram, an increase in bonding temperature above the eutectic temperature simultaneously reduces the solubility of B in Ni.…”

“…[32] Nishimoto et al [32] reported that K is 0.09, 0.80, and 6.75 at 1373. 15 [25,[28][29][30] is one third of that in Ni (0.3 at. pct).…”

“…pct and C s is regarded as 0.3 at. pct, [15,[21][22][23][24][25][26][27] as shown in Table IV. The initial B concentrations in the interlayer, C 0 , are 14.60 at.…”