Journal article
Microstructure and phase evolution in laser clad chromium carbide-NiCrMoNb
Applied surface science, Vol.357, pp.2391-2401
01 Dec 2015
Abstract
•Microstructural development during laser cladding has been studied.•In this multi component system Cr7C3 is found to be the stable carbide phase.•Phases were identified by EBSD since XRD results were not conclusive.•Increase in laser power and/or scanning speed reduced the carbide content.•Hardness seems to depend on phase content as well as microstructure.
Microstructural development in laser clad layers of Chromium carbide (CrxCy)-NiCrMoNb on SA 516 steel has been investigated. Although the starting powder contained both Cr3C2 and Cr7C3, the clad layers showed only the presence of Cr7C3. Microtexture measurements by electron back scattered diffraction (EBSD) revealed primary dendritic Cr7C3 with Ni rich FCC metallic phase being present in the interdendritic spaces. Further annealing of the laser clad layers and furnace melting of the starting powder confirmed that Cr7C3 is the primary as well as stable carbide phase in this multi component system. Increase in laser power and scanning speed progressively reduced carbide content in the laser clad layers. Increased scanning speed, which enhances the cooling rate, also led to reduction in the secondary arm spacing (λ2) of the Cr7C3 dendrites. The clad layer hardness increased with carbide content and with decreased dendrite arm spacing.
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Details
- Title
- Microstructure and phase evolution in laser clad chromium carbide-NiCrMoNb
- Creators
- L. Venkatesh - Indian Institute of Technology BombayI. Samajdar - Indian Institute of Technology BombayManish Tak - Arc InternationalRoger D. Doherty - Drexel UniversityRavi C. Gundakaram - Arc InternationalK. Satya Prasad - Arc InternationalS.V. Joshi - International Advanced Research Centre for Powder Metallurgy and New Materials
- Publication Details
- Applied surface science, Vol.357, pp.2391-2401
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Identifiers
- 991019167736904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Coatings & Films
- Physics, Applied
- Physics, Condensed Matter