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Microstructure formation and abrasive wear resistance of a boron-modified superduplex stainless steel produced by spray forming

Published online by Cambridge University Press:  23 September 2016

Juliano Soyama Open the ORCID record for Juliano Soyama [Opens in a new window] ,
Guilherme Zepon ,
Thiago Pama Lopes ,
Leamar Beraldo ,
Claudio Shyinti Kiminami ,
Walter José Botta  and
Claudemiro Bolfarini
Juliano Soyama*
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
Guilherme Zepon
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
Thiago Pama Lopes
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
Leamar Beraldo
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
Claudio Shyinti Kiminami
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
Walter José Botta
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
Claudemiro Bolfarini
Affiliation:
Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos, 13565-905 São Carlos, Brazil
*
a) Address all correspondence to this author. e-mail: julianosoyama@gmail.com
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Abstract

The microstructure formation and wear resistance of a superduplex stainless steel modified with the addition of 3 wt% boron produced by spray forming were investigated. Thermodynamic simulations were used as comparison basis and to explain the experimentally observed microstructure, which was composed by primary M2B-type borides, an austenitic-ferritic matrix, and eutectic M3B2-type borides. The predicted solidification sequence started with the precipitation of primary M2B boride, followed by ferrite/austenite formation and a final eutectic reaction resulting in M3B2 borides. A good correlation with the simulations and final microstructure was found. The abrasive wear resistance was investigated with the dry sand/rubber wheel test and the results indicated an outstanding performance, similar to the cobalt-based Stellite 1016 alloy. The excellent wear resistance resulted from the presence of a significant amount (about 35 vol%) of hard borides homogeneously dispersed in the microstructure, which was effective at increasing hardness and protecting the duplex matrix against abrasion.

Keywords

steelboronspray deposition
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 2987 - 2993
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Copyright
Copyright © Materials Research Society 2016 

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