Effect of Single- and Multi-layer Cladding of Duplex Stainless Steel on Its Microstructure, Dilution, and Hardness Characteristics
摘要
In the present work, a duplex stainless steel was deposited using shielded metal arc-based weld cladding technique on a medium carbon low alloy quenched and tempered steel. The objective of weld cladding is to refurbish rotating components like shafts and axles. Single, double, and triple layers of weld cladding specimens were prepared at constant welding current. Microstructural investigations were conducted using X-ray diffraction (XRD), stereo, optical and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). It was observed that metallurgical dilution was maximum for the single-layer cladded specimen, followed by double-layer cladding and minimum for the triple-layer cladding. This manifested as the fraction of ferrite was higher for triple-layer cladding compared to single-layer cladding. There was an abrupt rise in the hardness of the heat-affected zone (HAZ) for the single- and double-layer cladding which got subsided for the triple-layer cladding due to repeated heating and cooling cycles. This work sheds important insights into the important role of number of cladding layers on the microstructure and mechanical properties of the arc-based cladded alloys.