Plasma transferred arc surface modification of a low carbon steel

The potential of Plasma Transferred Arc (PTA) hardfacing goes beyond the surface welding of superalloys. This work evaluated low carbon steel surface modification by PTA deposition of fine WCoC carbides, and mixtures of Fe powders and 5–35 wt% carbides. Characterization included visual inspection, o...

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Bibliographic Details
Published in:Journal of materials science 2007-09, Vol.42 (17), p.7554-7557
Main Authors: Tigrinho, João J, d’Oliveira, Ana Sofia C. M
Format: Article
Language:English
Subjects:
Applied sciences
Carbides
carbon
Dendritic powders
Dendritic structure
Diffraction
Exact sciences and technology
Hard surfacing
hardness
iron
Low carbon steel
Low carbon steels
Materials science
Metals. Metallurgy
Microhardness
Microstructure
Morphology
Other surface treatments
Plasma arc welding
powders
Production techniques
Scanning electron microscopy
Solidification
steel
Superalloys
Surface treatment
Widmanstatten structure
X-ray diffraction
X-rays
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Summary:The potential of Plasma Transferred Arc (PTA) hardfacing goes beyond the surface welding of superalloys. This work evaluated low carbon steel surface modification by PTA deposition of fine WCoC carbides, and mixtures of Fe powders and 5–35 wt% carbides. Characterization included visual inspection, optical and scanning electron microscopy, X-ray diffraction and microhardness profiles. PTA processing allowed for the dissolution of carbides confirmed by X-ray diffraction, leading to homogeneous microstructures. Microstructures varied from a Widmanstätten morphology to a typical dendritic solidification structure upon the WCoC content. Surface soundness depended on powder preparation and composition. Sound surfaces exhibiting hardness up to 700 Hv were obtained for the 35 wt% WCoC powder mixture.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-1615-9