Brazing Incoloy 800 using the VZ-2177 filler foil. (December 2015)

• Record Type: Journal Article
• Authors: Wang, C. Y.; Yu, C.; Shiue, R. K.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 10
• Page Start: S10-249
• Page End: S10-252
• Publication Date: 2015-12
• Subjects: Vacuum brazing -- Nickel-based braze alloy -- Microstructural evolution -- Bonding strength -- Fracture; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000002158
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : Evaluating vacuum brazed IN-800/VZ-2177/IN-800 joints by changing the brazing parameters was performed. The joint contains two intermetallic phases, B2 Cr5 P and Cr4 Ni3 P4, in the Ni-rich matrix. The quantity of Cr4 Ni3 P4 compound in brazed joint is reduced with increment of brazing temperature/time because of B2 Cr5 P coarsening. Bonding strengths of joints are restricted by size of the B2 Cr5 P precipitates. Specimens brazed at 1323 and 1353 K with 40 μm VZ-2177 foil, coarsening of the B2 Cr5 P compound is not prominent, so they have the best average bonding strength of 236 MPa. The brazing temperature increased to 1383 K or filler metal thickness increased to 80 μm result in coarsening of B2 Cr5 P precipitates. Shear strengths of joints are impaired. The optimised brazing condition using the thickness of 40 μm VZ-2177 foil is between 1323 and 1353 K for 1200 seconds.