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Microstructure and hardness characterisation of laser coatings produced with a mixture of AISI 420 stainless steel and Fe-C-Cr-Nb-B-Mo steel alloy powders

Da Sun, Shi, Fabijanic, Daniel, Ghaderi, A., Leary, Martin, Toton, Jimmy, Sun, Shoujin, Brandt, Milan and Easton, Mark 2016, Microstructure and hardness characterisation of laser coatings produced with a mixture of AISI 420 stainless steel and Fe-C-Cr-Nb-B-Mo steel alloy powders, Surface and coatings technology, vol. 296, pp. 76-87, doi: 10.1016/j.surfcoat.2016.03.061.

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Title Microstructure and hardness characterisation of laser coatings produced with a mixture of AISI 420 stainless steel and Fe-C-Cr-Nb-B-Mo steel alloy powders
Author(s) Da Sun, Shi
Fabijanic, Daniel
Ghaderi, A.ORCID iD for Ghaderi, A. orcid.org/0000-0002-6774-9302
Leary, Martin
Toton, Jimmy
Sun, Shoujin
Brandt, Milan
Easton, Mark
Journal name Surface and coatings technology
Volume number 296
Start page 76
End page 87
Total pages 12
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-06-25
ISSN 0257-8972
1879-3347
Keyword(s) laser cladding
Fe-C-Cr-Nb-B-Mo alloy
hardfacing
microstructure
hardness
wear
Summary Fe-C-Cr-Nb-B-Mo alloy powder and AISI 420 SS powder are deposited using laser cladding to increase the hardness for wear resistant applications. Mixtures from 0 to 100 wt.% were evaluated to understand the effect on the elemental composition, microstructure, phases, and microhardness. The mixture of carbon, boron and niobium in the Fe-C-Cr-Nb-B-Mo alloy powder introduces complex carbides into a Fe-based matrix of AISI 420 SS which increases its hardness. Hardness increased linearly with increasing Fe-C-Cr-Nb-B-Mo alloy, but substantial micro-cracking was observed in the clad layer at additions of 60 wt.% and above; related to a transition from a hypoeutectic alloy containing α-Fe/α' dendrites with an (Fe,Cr)2B and γ-Fe eutectic to primary and continuous carbo-borides M2B (where M represents Fe and Cr) and M23(B,C)6 carbides (where M represents Fe, Cr, Mo) with MC particles (where M represents Nb and Mo). The highest average hardness, for an alloy without micro-cracking, of 952 HV was observed in a 40 wt.% alloy. High stress abrasive scratch testing was conducted on all alloys at various loads (500, 1500, 2500 N). Alloy content was found to have a strong effect on the wear mode and the abrasive wear rate, and the presence of micro-cracks was detrimental to abrasive wear resistance.
Language eng
DOI 10.1016/j.surfcoat.2016.03.061
Field of Research 091207 Metals and Alloy Materials
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
0204 Condensed Matter Physics
Socio Economic Objective 861201 Coated Metal and Metal-Coated Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083226

Document type: Journal Article
Collection: Institute for Frontier Materials
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