Brazing alloys based on the Ni—Cr—Zr system for brazing creep-resisting nickel alloys

摘要

The construction and repair of components of gas turbine engines is one of the most important tasks of engineering. These components are made from nickel-based alloys, with large quantities of Al and Ti. The structure of the alloys is represented by the y-phase (complexly alloyed solid solutions based on nickel), the y'-phase of the type Ni_3 (Al, Ti), which hardens the alloy and precipitates in dispersed form (the amount of this phase may increase to 50-60%), carbides (MeC, Me_6C, etc.), carbonitrides (Ti (C, N)), borides (Me_3B_2, etc.), or carboboride eutectic inclusions~(1'2). The main mechanism of hardening of the nickel creep-resisting alloys is associated with the formation of the y'-phase. The optimum diameter of the phase varies in the range from tens to hundreds of nanometres. An increase in the amount of the r-phase in the alloy, increases the service properties and impairs weldability.