1. Laser metal deposition of vanadium-rich high speed steel: Microstructural and high temperature wear characterization.
- Author
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Rahman, N. Ur, Capuano, L., Rooij, M.B. de, Matthews, D.T.A., Garcia-Junceda, A., Mekicha, M.A., Cordova, L., Walmag, G., Sinnaeve, M., and Römer, G.R.B.E.
- Subjects
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IRON alloys , *TOOL-steel , *HIGH temperatures , *LASER deposition - Abstract
Abstract A comparative high temperature wear study was conducted between two alloys: laser metal deposited vanadium-rich (V-rich) high speed steel (HSS) and spun cast carbide enhanced indefinite chilled double poured (CE-ICDP) iron. Laser Metal Deposition (LMD) of V-rich HSS alloy was performed by using a 4.0 kW Nd:YAG laser at three different laser scan speeds to investigate the effect thereof on the carbide size and morphology, phase constitution and mechanical properties (such as micro-hardness and wear resistance) of the laser metal deposits. A comprehensive microstructural characterization of these alloys revealed that the dendritic microstructure of the V-rich HSS alloy consisted of martensitic matrix and VC carbides. Increasing the laser processing speeds significantly changed the morphologies of VC carbides from square and round to angular and rod-like shapes. The micro-hardness of the V-rich HSS was improved from 760 HV to 835 HV by increasing the laser processing speed. During high temperature (500 °C) pin-on-disc wear tests, the V-rich HSS showed excellent wear resistance compared to CE-ICDP iron. It was found that V-rich HSS with square and round shape VC carbides (V-rich 10 mm/s) showed the most improved tribological performance with oxidative wear found to be the dominant wear mechanism at this temperature. Highlights • Increasing the processing speed changed the morphology of microstructural features of laser deposited HSS alloy. • Load bearing capability of VC carbides depends upon the size and shape of carbides. • Oxidative wear mechanism was found to be dominant at this temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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