Rare earth appended surfacing alloy and surfacing technique for preparation of aluminium matrix composite material

Abstract

The invention discloses a novel build-up welding alloy in order to solve the problem that aluminium composite materials have coarsening structure and is difficult to be controlled by the preparation process. The build-up welding alloy comprises , Ni, C, Co, Nb, Cr, Fe, Ti, Al and W, and mass percents of each component are as follows: rare earths: 6-8%; Ni: 45-48%; C: 0.6%; Co: 6-8%; Nb: 4%; Cr: 4-6%; Fe: 2-3%; Ti: 0.8-1.2%; Al: 4%;the residuel of W; in which, rare earths is yttria(Y2O3) or cesium (Cs), C is added in the form of graphite. The disclosed build-up welding alloy of the invention, as fused coating metal, is build-up welded on the surface of aluminium alloy based body using laser build-up welding arts to produce fine crystal grain surface aluminium alloy composite materials, and the surface of aluminium alloy product is intensified and improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a rare earth-added surfacing alloy and a laser surfacing process in the preparation of fine-grained surface layer aluminum-based composite materials. Background technique [0002] In order to improve the performance and service life of aluminum alloy parts, the surface of aluminum alloy parts is usually modified to achieve the integration of surface wear resistance, red hardness and high temperature oxidation resistance, internal toughness and excellent processing performance. . Common methods to realize the integration of surface strength, functionality and internal toughness of aluminum alloy parts are: coating technology (electroplating, chemical plating, ion plating, magnetron sputtering), ion implantation and deposition technology, spraying technology (plasma spraying, arc spraying, flame spraying), etc. The coating or film prepared by coating technology, ion implantation...

AI Technical Summary

Problems solved by technology

Although nano-Al 2 o 3 The addition of Al changes the grain growth morphology to a certain extent, gradually transitioning from very slender columnar dendrites to shorter dendrites, but the brittle and hard Al 2 o 3 The addition of strengthening particles increases the crack tendency of the surfacing layer at the same time, which weakens the bond between the surfacing alloy and the matrix and produces cracks. On the other hand, Al 2 o 3 The means of refining grains is easy to re-coarse the structure during product use (such as annealing process, etc.)

However, the purpose of preparing fine-grained aluminum alloy matrix composites with good metallurgical bonding cannot be achieved.