The applications of laser cladding in metallurgy industry

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• 作者：LIU ChangshengXU NijunLV JianbinWANG ZhengyiWANG Xuewei
• 会议时间：2013-06-01
• 关键词：laser cladding ; rolls and crystallizer ; microstructure and properties
• 作者单位：Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110006,China
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

Laser cladding is an advanced material processing technology with many advantages compared to alternative processes like overlay welding and thermal spraying and has potential to deposit various materials locally on highly non-planar and complex surfaces.It can be used to refurbish or improve corrosion,wear and other surface related properties of components.With a brief review of laser cladding,an introduction to case research in details was provided in which laser cladding of powders has been carried out on the surface of rolls and crystallizers and a number of experiments are carried out by changing the CO2 and Nd : YAG laser power,scanning speeds while keeping a constant Ni-based and High speed steel alloy powder feed rate,overlapping rate to produce different sizes of clad to improve the widely application of laser cladding in metallurgy industry.The microstructure of the laser cladding samples was investigated using optical and scanning electron microscopes,and x-ray analysis in order to determine the quality of the clad.The mechanical property ( micro- hardness and wear resistance) of the fabricated product has been evaluated using a micro-hardness and friction testing machine and correlated with the process parameters.The results show that a good metallurgically bonded clad of increased hardness and wear resistance is achieved.Extremely good clad layers were produced which were free from porosity and crack and well bonded to the substrate material.The superior micro-hardness and wear resistance value is attributed to grain refinement associated with laser melting and rapid solidification.The overall conclusions of this work were that laser cladding is an extremely effective process to modify the surface properties of equipment parts used in metallurgy industry.