Effects of Si Content on Solidification Behavior and Microstructure of 316L SS Laser Cladding Layer

GU Qing; BAO Haibin; WANG Yongqiang; FENG Minmin; DONG Gang; YOU Hanxiao; YANG Gaolin; YAO Jianhua

doi:10.16490/j.cnki.issn.1001-3660.2025.05.013

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Surface Technology ›› 2025, Vol. 54 ›› Issue (5) : 167-175. DOI: 10.16490/j.cnki.issn.1001-3660.2025.05.013

Laser Surface Modification Technology

Effects of Si Content on Solidification Behavior and Microstructure of 316L SS Laser Cladding Layer

GU Qing¹, BAO Haibin¹, WANG Yongqiang¹, FENG Minmin¹, DONG Gang², YOU Hanxiao², YANG Gaolin², YAO Jianhua²

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Abstract

In this study, the influence of different mass fractions of silicon (Si) on the solidification microstructure of 316L stainless steel during laser cladding process was investigated in details. A laser cladding system consisting of a LDF400-2000 fiber-coupled semiconductor laser and an ABB manipulator was utilized to deposit a cladding layer containing 0.8% and 1.6% Si on an 316L substrate. Multiple characterization techniques, such as optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and Vickers hardness testing were employed to assess the microstructure, formation mechanism, grain orientation, texture, and microhardness of the cladding layer both in the scanning direction (SD) and the tangential direction (TD).

Key words

laser cladding; Si element; 316L; solidification structure; grain refinement

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GU Qing, BAO Haibin, WANG Yongqiang, FENG Minmin, DONG Gang, YOU Hanxiao, YANG Gaolin, YAO Jianhua. Effects of Si Content on Solidification Behavior and Microstructure of 316L SS Laser Cladding Layer[J]. Surface Technology. 2025, 54(5): 167-175