1068
Electrochemical Investigation of Stainless Steel Cladded Carbon Steel Manufactured Via Powder Bed Selective Laser Melting

Tuesday, 15 May 2018: 16:10
Room 304 (Washington State Convention Center)
P. Murkute, S. Pasebani, and O. B. Isgor (Oregon State University)
This study aims to investigate the electrochemical and corrosion properties of 316L-stainless steel cladded carbon steel manufactured using powder bed the selective laser melting (PB-SLM) technique in various environments. The PB-SLM technique involves localized melting of a thin layer of 316L-SS powder bed with Yb - fiber laser. Main parameters of the PB-SLM process such as particle size, particle size distribution, laser power, laser-scanning speed and layer thickness were selected to optimize the density of the cladded layer and the quality of metallurgical bond to the substrate. Using the optimized process parameters, carbon steel substrates were cladded with stainless steel of various thicknesses. Several mechanical and microscopic tests (viz. nano-indentation, X-ray diffraction, Scanning electron microscopy) were performed to characterize both the bulk properties of the stainless steel layer and the interface between the cladding and the substrate. Electrochemical and corrosion properties were tested via. open-circuit potential monitoring, electrochemical impedance spectroscopy (EIS) and cyclic polarization (CP) in electrolytes with acidic to alkaline pH range and with increasing levels of chloride, simulating different application conditions. Scanning vibrating electrode technique was employed to study the galvanic corrosion properties of the stainless steel and carbon steel at the clad-substrate interface.