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

Sun, S, Fabijanic, D, Ghaderi, A, Leary, M, Toton, J, Sun, S, Brandt, M and Easton, M 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.


Document type: Journal Article
Collection: Journal Articles

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) Sun, S
Fabijanic, D
Ghaderi, A
Leary, M
Toton, J
Sun, S
Brandt, M
Easton, M
Year 2016
Journal name Surface and Coatings Technology
Volume number 296
Start page 76
End page 87
Total pages 12
Publisher Elsevier S.A.
Abstract 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.
Subject Metals and Alloy Materials
Manufacturing Processes and Technologies (excl. Textiles)
Tribology
Keyword(s) Fe-C-Cr-Nb-B-Mo alloy
Hardfacing
Hardness
Laser cladding
Microstructure
Wear
DOI - identifier 10.1016/j.surfcoat.2016.03.061
Copyright notice © 2016 Elsevier B.V. All rights reserved.
ISSN 0257-8972
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