Preparation Technology And Properties Research On Laser Cladding Of Stainless Steel-Carbon Steel Laminated Plates

Stainless steel-carbon steel laminated plates is stainless steel as cladding and carbon steel as matrix, combined together by the specific process of layered composite materials, which can give full play to the performance of the stainless steel such as corrosion-resisting, abrasion-resisting and heat-resisting, while can have carbon steel of high strength and good process ability and weld ability, etc. It can meet the requirements of the premise and reduce production cost, having enormous social and economic benefits, therefore that is widely used in petroleum, salt manufacturing, water conservancy, metallurgy, decoration and other fields. Stainless steel laminated plates have a higher request to interface bonding quality and performance. Adopting laser cladding preparation of metal laminated plates can overcome the disadvantages that exist in the traditional processing, such as traditional processing interface oxide impurities and low bonding strength. Preparation of laser cladding on the performance of stainless steel-carbon steel laminated plate can conform to the technical requirements of standard, with high bonding performance at the same time.Based on laser cladding preparation of stainless steel-carbon steel laminated plates as the research object, laser process parameters on the cladding layer macroscopic geometry size and quality of surface topography are studied; Metallographic morphology and tensile properties change rule of stainless steel-carbon steel laminated plates interface are analyzed; Micro structure of the stainless steel-carbon steel laminated plates are discussed. The main work done is as follows:(1) Using single factor and orthogonal test method carried out the single channel experiment of laser cladding of stainless steel powder, which studied the changes of laser power, scanning speed and power feeder on the influence law of single-channel cladding layer width and height through single factor. Single-channel cladding layer width and height increase as the amount of laser power and send powder increases, decrease as scanning speed increase; Three process parameters influence on the cladding layer width through orthogonal test as follows: scanning speed as greatest effect, laser power, finally to power feeder, three of that influence on the cladding layer height is:power feeder as greatest effect, scanning speed, finally to laser power. Different lap rate has different influence on surface roughness of cladding layer. The optimized process parameters is laser power of550-640W, scanning speed of300-500mm/min, powder feeder of2g/min and overlapping rate of30%.(2) Adjust laser power and scanning speed, this two process parameters changes to the influence law of the microstructure morphology, tensile strength and cladding thickness of stainless steel-carbon steel laminated plates interface morphology are studied. With the decrease of the energy density of the laser, stainless steel laminated plates interface is arranged in three microstructure morphology, which have wave heights of0.01～0.03mm、0.08～0.10mm and0.11～0.14mm, and layer thickness increases gradually. Meanwhile, the yield strength increases as the interface wave height increases.(3) Microstructure characteristics, element diffusion and micro-hardness distribution of stainless steel laminated plates were analyzed through test. Microstructure analysis and macro mechanical analysis were combined to understand material properties of laminated plates. Laser cladding plates obtained obtain dense and uniform layer and the grain refining of top layer improved its strength and hardness; Fe Cr Ni element of laminated plates on both sides occurred about12microns gradient diffusion across the interface; micro hardness decreases from cladding layer to matrix, which makes a smooth stress transition between cladding layer and matrix, then enhance its overall mechanical properties.Stainless steel-carbon steel laminated plates prepared by laser cladding have strong metallurgy bonding quality and good microstructure properties. The mechanical performance has reached the requirements of stainless steel standard (GB/T8605-2008). It indicates that this method is feasible. The work of this paper for laser cladding preparation of metal laminated plate provides theoretical and experimental basis.