Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
Volume 237, Issue 13, Pages 2969-2989Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/09544062221141267
Keywords
Laser cladding; microhardness; microstructure; CrNiW; CrNiFeAlZr; response surface methodology; optimisation; box-Behnken design
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Cladding-based repair using CrNiW and CrNiFeAlZr alloys was found to have better performance in extending die life compared to welding or flame spraying repair approaches. The CrNiW cladding had higher microhardness than the CrNiFeAlZr cladding and substrate, indicating its significant impact on microhardness. The optimization process was conducted using a response surface methodology with a Box-Behnken design.
Cladding-based repair has been found to be superior than welding or flame spraying repair approaches in terms of extending die life. In this work, two different alloy powders, that is, CrNiW and CrNiFeAlZr were coated on H13 steel using laser cladding. The laser power, powder feed rate and scanning speed were varied and the clad dimensions, aspect ratio and dilution percentage were measured. The microhardness found in the CrNiW clad is 834 +/- 20 HV0.5, which is higher than that of the CrNiFeAlZr clad (780 +/- 20 HV0.5) as well as the substrate clad (548 +/- 20 HV0.5). CrNiW clad has a higher microhardness than CrNiFeAlZr clad and substrate, indicating that CrNiW laser cladding has a significant impact on microhardness. The interface region for CrNiFeAlZr has 8.33% of C, which is less than the interface region for CrNiW (10.65% of C) so that the microhardness at the interface in CrNiW clad is high. The XRD patterns identified the common phase creation of Ni3C and Fe3C for CrNiFeAlZr and CrNiW coatings, while the oxide formation was only seen in CrNiFeAlZr coatings and the addition of carbon content in the CrNiW clad layer forms WC, Cr23C6, Ni3C and Fe3C. A response surface methodology with a Box-Behnken design is used in the optimisation process.
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