Effect of Samarium Content on Microstructure and Quality of P92 Steel Coating
Rare earth not only plays a catalytic role in the process of aluminizing,but also can improve the densification of the permeating layer.In this paper,the coatings with different rare earth contents(0,2％,4％,6％SmCl3)were prepared on the surface of ultra-supercritical P92 steel under certain technological conditions by embedding method.OM and SEM were used to observe and analyze the microstructure of the coating,SEM was used to scan the cross section elements of the coating,and XRD was used to analyze phase the surface of the coating.The results show that the coating without rare earth elements has uneven thickness and there are holes and cracks in the coating.Adding rare earth can increase the thickness of rare earth to different degrees,and a proper amount of rare earth can improve the coating quality.The comparison shows that the thickness of the permeation layer with 2％rare earth content is slightly thicker and uniform.The surface phase of the coating is AlCrFe2.This study provides information support for optimizing the content of rare earth in aluminizing agent and preparing the coating with better quality.
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