Microstructural ANalysis and performance Evaluation in Laser Cladding of Stainless Steel on the Surface of Plain Carbon Steel

摘要

Laser materials processing can produce finer and newer microstructures than conventional methods due to its coherent rapid solidification and is appliedwidely in many industrial applications. Laser cladding provides a way to make high-performnac ecoatings on relatively low requirement base metal to upgrade the properties of the surface such as oxide and wera resistance. The application of cladding of 304L piping products had bee nutilized for solving nuclear power plant erosion-Corrosion problems that affect the feedwater, condensate and steam system piping components. In this apper the stainlesssteel powder 316 was deposited onto a plain carbon steel substate to form a layer with a high corrosion resistance and hardness. A previous diffusion model for rapid solidification has bee nused to redict the type of microstructures. The microsturcture distributio observed in the laser-clad layers is in good agreement eith theoretical predictions. The microstructures of the joint show a complete joining between the cladding materials and the substrate. The cladding defect were minimized by controlling the processing parameters. the hardness test was conducted to compare the properties for the clad parts to those for base metals. The results show that laser cladding of stinless steel can improve the hardness of te surface very much.