Abstract
This study intends to investigate the feasibility of using laser cladding as a potential process to repair hot working tools by a hardfacing process. A Stellite 21 alloy coating was printed on a 350 maraging steel via laser cladding and the coating microstructure and tribological performance were characterized in as printed conditions and after heat treatment. Such a laser-processed coating showed a high integrity with little porosity and good bonding with the substrate. The Stellite coating produced substantially lower friction and a smoother contact area but had inferior wear resistance compared with the maraging steel substrate. Post process heat treatment at 650 °C for 20 h led to significant amount of strain-induced FCC to HCP phase transformation but had little improvement in wear resistance. Detailed materials characterization using X-ray diffraction and electron microscopy provided fundamental insights to the underlying mechanisms. This study opens the door for future R&D for tool surface repair by laser cladding.
| Original language | English |
|---|---|
| Article number | 203990 |
| Journal | Wear |
| Volume | 482-483 |
| DOIs | |
| State | Published - Oct 15 2021 |
Bibliographical note
Publisher Copyright:© 2021 Elsevier B.V.
Funding
Note: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). The funding for this study was provided by Ford under a Ford-ORNL Alliance Program. Authors would like to acknowledge T. Geer from ORNL for optical microscopy of baseline samples on the laser treated samples. Note: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). The funding for this study was provided by Ford under a Ford-ORNL Alliance Program . Authors would like to acknowledge T. Geer from ORNL for optical microscopy of baseline samples on the laser treated samples.
| Funders | Funder number |
|---|---|
| DOE Public Access Plan | |
| Ford Foundation | |
| U.S. Department of Energy | |
| Oak Ridge National Laboratory | DE-AC05-00OR22725 |
Keywords
- Hot working die
- Laser cladding
- Phase transformation
- Stellite coating
- Wear
