Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10668058 | Surface and Coatings Technology | 2014 | 7 Pages |
Abstract
Amorphous coatings exhibit prominent properties, including high hardness and good wear resistance properties. In this study, Ni-based amorphous composite coatings with a composition of (Ni0.6Fe0.4)68B18Si10Nb4 were prepared on a mild steel substrate via high power diode laser cladding plus laser remelting processes. The microstructure of the coating was studied using X-ray diffraction (XRD) and a scanning electron microscope (SEM). The effect of the remelting scanning speed on the amorphous forming ability of the Ni-based alloy was studied systematically by experimental and numerical simulation methods. The results indicated that there was no amorphous phase formed when the scanning speed was 4Â m/min and 5Â m/min. The amorphous phase was observed when the remelting scanning speed was 6Â m/min. The amorphous phase volume fraction increased with an increase in the remelting scanning speed. The fraction was found to be approximately 64% when the remelting speed was 8Â m/min. The simulation results indicate that the increase in the remelting scanning speed may lead to lower residence time and higher cooling rate of the melted pool. As a result, high remelting scanning speed can be concluded to be a necessary condition for the formation of the amorphous phase when using the laser cladding plus laser remelting process.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Ruifeng Li, Yajuan Jin, Zhuguo Li, Yanyan Zhu, Mingfang Wu,