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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructural characterization and wear resistance of boride-reinforced steel coatings produced by Selective Laser Melting (SLM)

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Martins Freitas, Brenda Juliet [1, 2] ; de Oliveira, Vinicius Antonio [1, 2] ; Gargarella, Piter [1] ; Koga, Guilherme Yuuki [1] ; Bolfarini, Claudemiro [1]
Total Authors: 5
[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos - Brazil
[2] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, BR-13565905 Sao Carlos - Brazil
Total Affiliations: 2
Document type: Journal article
Source: SURFACE & COATINGS TECHNOLOGY; v. 426, NOV 25 2021.
Web of Science Citations: 0

Surface engineering is an effective method to extend the lifespan of carbon steels submitted to severe wear degradation. In this work, the surface of a low carbon steel (AISI 1020) was protected by a boron-modified stainless steel coating produced by selective laser melting (SLM). Commercial precursors such as 2205 duplex stainless steel and ferrous-alloy (Fe-B) were used to produce boron-modified steel powders by two different routes: i) gas atomization, and ii) gas atomization followed by mechanical milling of large particles (to reduce the particles' size and to add a solid lubricant - hexagonal boron nitride, h-BN). Thick coatings (200 - 600 mu m) metallurgically bonded to the substrate were produced with reduced dilution, characterized by refined, hard and rigid borides homogeneously distributed within the predominant ferritic matrix. The boron-modified steel coatings were hard (similar to 800 HV0.5) and wear-resistant, since the specific wear rate was similar to 4.5 x 10(-5) mm(3).N-1.m(-1), much inferior to that of the soft (similar to 120 HV0.5) AISI 1020 substrate (similar to 1.8 x 10(-3) mm(3).N-1.m(-1)). Although recognized as solid-lubrificant, the coating produced by powder containing h-BN additions did not exhibit reduced coefficient of friction. Given the high temperatures achieved during SLM process, the h-BN may decompose, being the remaining content insufficient to enable the formation of an effective lubrificating layer. The present work contributes to widespread the use of SLM to produce wear-resistant protective coatings using boride-reinforced stainless steels. (AU)

FAPESP's process: 17/27031-4 - Effect of process parameters on the metallurgical characteristics of additive-manufactured alloys
Grantee:Piter Gargarella
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 18/23810-1 - Investigation about the possibility of hexagonal boron nitride formation to superduplex stainless in order to reduce friction coefficient
Grantee:Vinicius Antonio de Oliveira
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 19/05885-7 - Microstructure, mechanical properties and corrosion resistance of boron-modified stainless steels processed by additive manufacturing
Grantee:Brenda Juliet Martins Freitas
Support Opportunities: Scholarships in Brazil - Doctorate