Study Of AlFeCuCrCo-X Wear-resistant Surfacing Alloys

In recent years,the development and research of wear-resistant alloys have tended to be gradual.However,with the continuous development of science and technology,new wear-resistant alloys with better performance are still waiting to be developed.Because wear-resistant materials account for a very large proportion of the consumption in the industrial sector.This has led to an increase in production costs.Therefore,The continuous development and systematic research of wear-resistant materials and anti-wear technology has significant and far-reaching significance.In order to expand the research field of wear-resistant materials,the project selected Al,Fe,Cu,Cr and Co as the fundamental elements,and selected W/Mo as the adjustment elements.The effect of W/Mo on the properties of alloys were analyzed by changing the content of W/Mo.The surfacing alloys with wear resistance were prepared by plasma surfacing.And the organization and mechanical properties of the surfacing alloys were analyzed and tested,the microstructures,microhardness,wear resistance,corrosion resistance and thermal expansion performance of the surfacing alloys with different contents of W/Mo were studied.After research and analysis,the following conclusions have been drawn:（1）For AlFeCuCrCoW_x,when the content of W is 1.0mol,the mechanical properties of the surfacing layer are the best（highest hardness and best wear resistance）.And the microhardness value is 525HV,and the wear extent is 0.16g.The corrosion resistance of AlFeCuCrCoW is the best,and the corrosion weight loss is 0.012g.Through thermal expansion experiments,it is found that the thermal stability of Al FeCuCr CoW is the best.The phase transition temperature is 738.85℃.The elongation of the sample is 129.542μm.The coefficient of linear expansion is 0.65‰.In short,AlFeCuCrCoW has the best comprehensive performance.（2）For AlFeCuCrCoMo_x,when the Mo content is 1.5mol,the hardness of the surfacing layer is the best.And the microhardness value is 560HV.The corrosion resistance of AlFeCuCrCoMo_1.5 is the best,and the weight loss of corrosion is 0.003g.However,the wear extent is minimal at x=0.8.In other words,with the increase of Mo content,its wear resistance deteriorated,but its corrosion resistance gradually increased and reached the best at x=1.5.Through thermal expansion experiments,it is found that the thermal stability of AlFeCuCrCoMo_1.5 is the best.The phase transition temperature is 734.85℃.The elongation of the sample is 116.985μm.The coefficient of linear expansion is 0.58‰.（3）The phase composition of AlFeCuCrCoW_x and AlFeCuCrCoMo_x surfacing layers are mainly intermetallic compounds.When the content of W reaches 1.0 mol and the content of Mo is 1.5mol,the type and amount of intermetallic compounds in the structure reached the maximum.The microstructure of AlFeCuCrCoW is dendritic.The microstructure of AlFeCuCrCoMo_1.5 is isometric crystal.Both alloys have finely dispersed particles at the grain boundaries.And the organization is even.