Reactive gas shielding during laser surface alloying for production of hard coatings

The effects of nitrogen addition to shielding gas during laser surface alloying with a mixture of 80 wt.% 431-type stainless steel and 20 wt.% titanium carbide powders were investigated. Microstructural characterization of the laser deposits indicated that titanium carbide melted and re-precipitated...

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Bibliographic Details
Published in:Surface & coatings technology 2006-01, Vol.200 (8), p.2663-2671
Main Authors: Babu, S.S., Kelly, S.M., Murugananth, M., Martukanitz, R.P.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Hardness testing
Iron alloys
Laser melting
Materials science
Other topics in materials science
Physics
Reactive gas shielding
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Summary:The effects of nitrogen addition to shielding gas during laser surface alloying with a mixture of 80 wt.% 431-type stainless steel and 20 wt.% titanium carbide powders were investigated. Microstructural characterization of the laser deposits indicated that titanium carbide melted and re-precipitated as fine carbides from the liquid melt during cooling. With 100% nitrogen shielding and the same powder mixtures, a deposition with increased hardness was obtained. The microstructural evolution in the deposit was calculated with equilibrium thermodynamic calculations.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2005.02.160