A kind of alloy powder for laser cladding repair of gray cast iron and preparation method thereof

Abstract

The invention provides alloy powder for gray pig iron laser cladding repair and a preparation method of the alloy powder. The alloy powder comprises the chemical components, by weight, 12% to 24% of Cu, 1.5% to 3.5% of C, 0.2% to 2.4% of Si, 0.01% to 0.05% of Al, 0.005% to 0.01% of Ba, 0.001% to 0.01% of Ca, 0.5% to 1.2% of Co, 0.0% to 0.04 % of Y2O3, 0.0% to 0.03% of La2O3, 0.0% to 0.04% of Ce and the balance Ni. According to the alloy powder, because alloy matrix strengthening elements, graphitizing-promoting elements and grain refinement grain boundary strengthening elements are added, and the percentages of the elements are adjusted, alloy acquires the excellent comprehensive performance, the alloy has both the appropriate hardness and the appropriate strength, the possibility of white cast tissue forming is reduced, shock resistance and fatigue resistance are improved, the crack resistance, the formability, the process stability and the component uniformity of the alloy powder in a laser cladding layer are improved, and an effective method convenient to use is provided for successive repair of gray pig iron parts.

Description

technical field [0001] The invention belongs to the field of science and technology of alloy powder materials, and provides an alloy powder material for repairing gray cast iron by laser cladding method with reduced carbon diffusion, moderate hardness, fatigue resistance, excellent impact resistance, and excellent cladding performance and a preparation method thereof The invention is also applicable to other cast iron parts, and specifically relates to an alloy powder for gray cast iron laser cladding repair and a preparation method thereof. Background technique [0002] Gray cast iron has the advantages of good casting performance, excellent vibration damping, good cutting performance, etc., and is widely used in various departments of equipment manufacturing, metallurgy, agricultural machinery, water supply and drainage, and national defense industry. According to statistics, the economic loss caused by gray cast iron casting defects in my country is as high as tens of bil...

AI Technical Summary

Problems solved by technology

These mixed powders have problems such as uneven mixing, poor fluidity, and large differences in expansion coefficients, which lead to uncontrollable defects such as cracking, porosity, white mouth, segregation, unstable performance, and difficult machining in actual cladding.