Abstract
The surface of bainitic steel was remelted by fiber laser, and the microstructure and mechanical properties of the melted layer were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), a nanoindentation instrument, and wear equipment. The study of changing the laser scanning speed showed that the depth of the melted layer increases with decreases of the laser scanning speed. The wear-resistance property increased by 55% compared with the matrix and decreased with the reduction of laser scanning speed within a certain range. In the study of changing the laser-scanning space, the thermal effect of laser melting in the back channel on the front channel was further validated. At the same time, it was found that the solidified layer surface of hardness alternating with softness can be obtained by appropriately expanding the scanning space, which is conducive to improving the wear-resistant properties of the steel surface, and properly improving the production efficiency of the laser remelting treatment.
Highlights
Bainitic steel has been widely studied, developed, and applied because of its diverse structure and various matchings of good performance [1,2,3,4]
Study, an analysis was conducted the results of microstructure, the surface remelting of bainitic which provides a reference for on hardness, friction, and wear tests to study the influence of scanning speed and scanning space of an optical fiber laser on the surface remelting of bainitic steel, which provides a reference for multiple-pass laser surface remelting (MPLSR)
laser surface remelting (LSR) with Different Laser Scanning Speeds molten materials are very obvious on the surface of the samples
Summary
Bainitic steel has been widely studied, developed, and applied because of its diverse structure and various matchings of good performance [1,2,3,4]. Xing et al [15,16,17] achieved a significant improvement of the surface hardness of bainitic steel by studying the influence of different laser scanning speeds on the modified layer. An was conducted on of thelaser results of microstructure,layers hardness, friction, by technological such as of laser scanning speed scanning. Optical fiber laser on data on MPLSR are rare In this steel, study, an analysis was conducted the results of microstructure, the surface remelting of bainitic which provides a reference for on MPLSR strengthening technology. Hardness, friction, and wear tests to study the influence of scanning speed and scanning space of an optical fiber laser on the surface remelting of bainitic steel, which provides a reference for MPLSR. Bainitic steel used as and its main chemical composition shown the samples werewas grinded bythe
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