Moderate-temperature Zr-based brazing filler metal special for Ti2AlNb-based alloy identical or different material brazing and preparation method and brazing process of brazing filler metal

Abstract

The invention belongs to the field of welding and particularly relates to moderate-temperature Zr-based brazing filler metal special for Ti2AlNb-based alloy identical or different material brazing anda preparation method and a brazing process of the brazing filler metal. According to weight percentage, the brazing filler metal comprises 5%-30% of Fe, 1%-15% of Nb or 1%-20% of Cu, <=5% of oligoelements including one or two or more of Al, B, Co, Cr, Mn, Mg, Ni, Ag, and Zn, <=2% of microelements including one or two or more of Ti, Hf, V, Ta, Mo, W, Au, Si, Sn, Pd and Ga, and the balance of Zr elements and unavoidable impurity elements. The preparation method of the brazing filler metal comprises the steps that firstly, raw materials are weighed; secondly, mother alloy of the brazing filler metal is smelted; and thirdly, the smelted mother alloy is subjected to quenching melt-spinning, and then the brazing filler metal is obtained. The brazing filler metal is used for brazing according tothe brazing process of 960 DEG C to 1,030 DEG C and 0-120min. Compared with existing brazing filler metal, the prepared brazing filler metal has an appropriate melting point, excellent wettability and high-temperature mechanical properties, and brazing filler metal preparation and the brazing process are simple.

Description

Technical field [0001] The invention belongs to the field of welding, and specifically relates to a Ti 2 A special medium-temperature Zr-based brazing filler metal for the brazing of the same material or dissimilar materials of AlNb-based alloy, and a preparation method and brazing process thereof. Background technique [0002] As we all know, the engine is the heart of various types of aircraft, and the biggest constraint on its development is the degree of development of aviation and aerospace engine materials. Due to the harsh service conditions of engines in the aviation and aerospace fields, this requires materials not only to have excellent room temperature performance, but also to have excellent high temperature performance. At the same time, the material must have good processing performance and high specific strength to facilitate the processing of parts and reduce the proportion of components. [0003] Nickel-based superalloys have high specific strength, good oxidation ...

AI Technical Summary

Problems solved by technology

However, the existing Ti-based solder has the following three deficiencies: first, Ti 2 As a titanium alloy material used at high temperature, AlNb-based alloys have a higher service temperature than ordinary titanium alloys. Using low-temperature Ti-based solders for welding (such as: Ti-Zr-Cu-Ni-based solders, etc.) will lead to high temperatures in welded joints. performance reduction; secondly, Ti 2 The commonly used solid solution temperature of AlNb-based alloys is 980°C / 2~4h. If high-temperature Ti-based solders are used for welding (such as: Ti-Ni-Nb series, Ti-Cr-Ta / Nb series solders, etc.), it will cause The base metal undergoes a phase transformation at around 1050 °C, which also changes its mechanical properties, so that it cannot reach Ti 2 Service requirements for AlNb-based alloy base metals; finally, Ti 2 AlNb-based alloys also represent a class of titanium alloys with similar phase transition characteristics, and there are few studies on the brazing filler metals that can meet the brazing requirements of this type of titanium alloys.