Effect of Nb on microstructure and wear resistance of low-carbon Stellite alloy laser cladding coating
Effect of Nb addition on microstructure, elements and phases distribution, room and high temperature wear properties of low-C Stellite alloy laser cladding specimens was investigated by SEM, EDS, XRD and pin-on-disc tribometer. The results show that addition of Nb refines the microstructure of the cladding layer and also approximately doubles the volume fraction of strengthening phases compared with original alloy due to formation of NbC with slightly increased C content. The main phases in the microstructure consist of γ-Co and strengthening phases Co3Mo, NbC. Adhesive wear is the main wear mechanisms for the alloy which contains Nb at room temperature. The presence of NbC carbide phase enhances twice the wear resistance of the cladding layer at 400℃. The main wear mechanisms of the cladding layer include oxidative wear and adhesive wear.
|Keywords||Laser cladding, Low-carbon Stellite alloys, Nb element, Wear|
|Journal||Jinshu Rechuli/Heat Treatment of Metals|
Ren, F. (Fangcheng), Yao, J. (Jianhua), Liu, R, Chen, X. (Xinchao), & Mao, W. (Wei). (2016). Effect of Nb on microstructure and wear resistance of low-carbon Stellite alloy laser cladding coating. Jinshu Rechuli/Heat Treatment of Metals, 41(10), 15–20. doi:10.13251/j.issn.0254-6051.2016.10.004