Microstructure investigation of hardfacing welds made of cobalt-based alloys

The article presents the results of laboratory tests on the microstructure of hardfacing welds made of cobalt-based alloys (stellites). Using a high-power ROFIN DL 020 diode laser and AMI 3901 powder, hardfacing tests were performed on samples and valves made of austenitic valve steel. By applying various laser processing parameters and conducting studies on surface topography, microstructure, and microhardness, the best technological variant was selected.Analyzing the microstructure, a fine-grained structure with high microhardness, reaching up to approx. 550 HV0.1, was observed in the remelted zones. The technological laser hardfacing tests should be considered positive, and the fine-grained microstructure of the produced welds promises high resistance to friction under gas corrosion conditions.
THE INVESTIGATION OF PADDING WELD MICROSTRUCTURE MADE FROM ALLOYS ON THE BASE OF COBALT
The laboratory investigation results of padding microstructure made from alloys on the base of cobalt (stellits) were introduced in the article. (…)

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