Effect of Pulse Width on Microstructure and Hardness of FeSiB Coatings by Laser Cladding
GONG Yu-bing1, WANG Shan-lin1, LI Hong-xiang2, KE Li-ming1, CHEN Yu-hua1, MA Bin1
1. National Defence Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;
2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Abstract:High-density coating with FeSiB amorphous ribbons as cladding materials on the surface of mild steel was fabricated by laser cladding. The effect of different pulse widths on formability, microstructure and microhardness of the coatings was analyzed by optical microscope(OM), X-ray diffractometer (XRD), scanning electron microscope (SEM) and microhardness tester. The results show that with the increase of the pulse width, the coating dilute rate rises; the tendency of crack increases and the crack originates from surface to the interface; the degree of crystallization increases and crystallization phases are α-Fe, Fe2B and Fe3Si, fusion zone width increases and the trend of columnar crystals along the epitaxial growth becomes bigger and bigger; the microhardness firstly increases and then decreases. When pulse width is 3.2ms, the structure of the coating is compact, no hole defects, the interface exhibits a good metallurgical combination and the dilute rate is low about 23.2%. Average microhardness of the coating reaches 1192HV, which is about 10 times as much as the substrate.
龚玉兵, 王善林, 李宏祥, 柯黎明, 陈玉华, 马彬. 脉冲宽度对激光熔覆FeSiB涂层组织与硬度的影响[J]. 材料工程, 2018, 46(3): 74-80.
GONG Yu-bing, WANG Shan-lin, LI Hong-xiang, KE Li-ming, CHEN Yu-hua, MA Bin. Effect of Pulse Width on Microstructure and Hardness of FeSiB Coatings by Laser Cladding. Journal of Materials Engineering, 2018, 46(3): 74-80.
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