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

The influence of the parameters of the 14-5 PH steel and Fe-TiC composite, the vacuum brazing using nickel-based brazing filler metal BNi2 on structure and properties of joints was investigated. The joint has multilayer structure with a zone of intermetallic compounds, which differ on account of a chemical composition, microstructure and hardness from a brazing filler metal matrix. The diffusive zone from the 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, nickel, iron and molybdenum. As a result of conducted experiments, a production of spinning nozzle of a die for polyethylene granulation with a vacuum-brazed Fe-TiC composite cutting surface have been worked out and applied in industry. [Received on 25 October 2006; Accepted on 10 February 2007]