(1．安徽工業(yè)大學(xué) 激光加工研究中心, 馬鞍山 243002；
2．Department of Materials Science and Engineering,
The Changwon National University,
9 Sarium-dong, Changwon 641-773, South Korea；
3．Division of Engineering, Colorado School of Mine,
Golden, CO 80401, USA)
摘 要: 運用激光熔覆技術(shù)在16Mn鋼表面制備了鈷基合金涂層(Co55)、 含20%SiCp(體積分?jǐn)?shù), 下同）的鈷基合金涂層(CoSiC)以及含20%B4Cp鈷基合金涂層(CoB4C), 比較研究了合金涂層的組織、相結(jié)構(gòu)、 顯微硬度及滑動磨損性能。 結(jié)果表明： 合金涂層由涂層結(jié)合區(qū)的胞狀共晶組織及涂層區(qū)的樹枝狀亞共晶組織組成, CoSiC涂層及CoB4C涂層的樹枝晶比Co55涂層的更細(xì)小； B4Cp及SiCp在熔覆過程中完全熔解， 其分解出的B, C, Si與涂層中的合金元素結(jié)合形成了更多的化合物, Co55涂層由/γ/-Co和（Cr, Fe）7C3組成, CoSiC涂層由γ-Co, Cr7C3, Cr23C6, CoSi2, Cr3Si和Si2W組成, CoB4C涂層由γ-Co, Cr7C3, Cr23C6, CrB, CrB2和Fe23(C, B)6組成； 3種激光熔覆涂層的顯微硬度及耐磨性由高到低的順序為CoB4C→CoSiC→Co55。 對涂層的強化機理進(jìn)行了分析。
關(guān)鍵字: 激光熔覆； 鈷基合金； SiC； B4C； 組織； 耐磨性
B4Cp and SiCp
Je-Hyun Lee2, Mark T.Lusk3
（1．Research Center for Laser Processing,
Anhui University of Technology, Maanshan 243002, China；
2．Department of Materials Science and Engineering,
The Changwon National University,
9 Sarium-dong, Changwon 641-773, South Korea；
3．Division of Engineering, Colorado School of Mine, Golden, CO 80401, USA）
Abstract:The laser surface cladding technique was used to form Co-based alloy coating, 20% SiCp Co-based composite coating (CoSiC) and 20% B4Cp Co-based composite coating (CoB4C) on the 16Mn steel substrate by 5kW CO2 continuous wave laser. Microstructure, phase constitution, micro-hardness and sliding wear properties of the coatings were studied. The results show that the microstructures of the coatings are consisted of the cellular eutectic structures of bonding zone and the dendrites of coating zone. The dendrites of CoSiC and CoB4C coatings are much finer than that of Co55 coating. SiCp and B4Cp are completely dissolved in Co-based alloy during laser cladding processing, and more eutectic compounds exist in the CoSiC and CoB4C coatings. Co55 coating is consisted of γ-Co and （Cr, Fe）7C3, but CoB4C is consisted of γ-Co, Cr7C3, Cr23C6, Fe23(C, B)6 and CrB and CoSiC coating is consisted of γ-Co, Cr7C3, Cr23C6, CoSi2, Cr3Si and Si2W. Microhardness and sliding wear resistance of the three coatings are in the order of CoB4C→CoSiC→Co55 from high to low. The strengthen mechanism of the coatings is simplify analyzed.
Key words: laser cladding; Co-based alloy coating; B4C; SiC; microstructure; wear resistance
