司太立合金增材制造技术研究进展OA

Stellite series cobalt-based alloys,known for their exceptional high-temperature strength,wear resistance,and corrosion resistance,have become an ideal coating material for wear-resistant components in industrial applications.Traditional surfacing technology suffers from issues such as high dilution rate and coarse microstructure,while laser additive manufacturing,particularly laser-directed energy deposition,offers a novel approach for fabricating high-performance Stellite alloy coatings.This paper systematically reviews the latest research progress in this field.Firstly,the classification of Stellite alloys based on the Co-Cr-W and Co-Cr-Mo systems is introduced,and their solid-solution strengthening and carbide strengthening mechanisms,as well as the influence of carbon content on the micro structure and properties,are elucidated.Secondly,the principle of laser-directed energy deposition is discussed,with a focus on how key process parameters such as laser power and scanning speed regulate the microstructure of the cladding layer and their impact on suppressing defects like cracks and pores.Based on this,various strategies to enhance the comprehensive performance of the coatings are summarized from three aspects:alloy composition design,in-process thermal assistance control,and post-heat treatment and surface mechanical treatment.Finally,the friction and wear behavior of the coatings under room temperature,high temperature,and emerging cryogenic environments,along with the current research status,are summarized.Future development trends are prospected,including research on cryogenic tribology mechanisms and the intelligent correlation of process,microstructure,and properties,providing a theoretical reference for the development and engineering application of high-performance laser additively manufactured Stellite alloy coatings.