Influence of Substrate on the Tribological Behavior of Inconel 625 GMAW Overlays
Source abstract
Abstract
This study investigates the microstructure and tribological behavior of Inconel 625 overlays applied via GMAW (Gas Metal Arc Welding) with and without a 316LSi stainless-steel intermediate layer on top of A36 steel. The microstructural characterization was conducted via FESEM with EDS. The tribological behavior was evaluated using a tribometer in a reciprocating configuration. The results showed that the wear rate of the Inconel 625 weld overlay with the 316LSi intermediate layer was higher than without it. However, no variations were observed in terms of hardness and the friction coefficient of the Inconel 625 weld overlays. The difference in the behavior of the two coatings was justified due to the microstructure morphology found in each case and chemical composition. When applied without the intermediate layer, Inconel 625 coating’s structure was dendritic, whereas it was cellular otherwise. An increase in the amount of Nb was observed in the layer deposited over 316LSi. This rise likely led to an increase in the number of precipitates and/or Laves phase formation. Thus, the results indicated that the difference in thermal conductivity and dilution between the stainless and carbon steels modifies the morphology of the microstructure of the Inconel 625 weld overlay, decreasing wear resistance when deposited on top of the stainless steel.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Additive Manufacturing Materials and Processes · Metal Alloys Wear and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Electrical, Mechanical, and Computer Engineering, Federal University of Goiás, Goiânia 74690-900, Brazil
Faculty of Mechanical Engineering, Federal University of Uberlândia, Uberlândia 38408-100, Brazil
School of Engineering, Federal University of Rio Grande, Rio Grande 96203-900, Brazil
Funding
Brazilian National Council for Scientific and Technological Development (CNPq)
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