Brazing of 14-5 PH steel and Fe-TiC composite using AWS BNi2 filler metal

Purpose: Purpose of this paper is description of influence of the parameters of the 14-5 PH steel and cements - PM Fe-TiC composite plates brazing using nickel based brazing filler metal BNi2 structure and properties of joints. Design/methodology/approach: Brazing was done in vacuum according to a special thermal cycle programme. Metallographic, X Ray analysis, microanalysis, hardness and tensile strength, as well quality investigations of produced joints have been done. Findings: It was shown that the joint has a eutectic multilayer structure with a zone of intermetallic compounds in the steel - soldier and soldier - PM Fe-TiC composite - Ferro - Titanit plates boundary. Intermetallic compounds zone differ clearly on account of a chemical composition, microstructure, and hardness from a brazing filler metal matrix. Research limitations/implications: It was shown that the diffusive zone from the PM Fe-TiC composite side is rich in titanium, molybdenum and iron, in the joint axis there is a zone rich in silicon, and in a boundary filler metal - steel rich in iron and nickel. In the rich in nickel and iron filler metal matrix, there are intermetallic phases rich in chromium, which consist several percent of nickel, iron and molybdenum. The diffusive zones are characterized by hardness higher than the filler metal matrix. Practical implications: As a result of conducted experiments a production of spinning nozzle of a die for polyethylene granulation with a vacuum-brazed with a PM Fe-TiC composite plates cutting surface have been worked out and applied in industry. Originality/value: An original value of the paper is to prove the propensity of concentration gradients of alloying components and intermetallic phases creation.