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

Autor(es)

Soyama, Juliano ; Zepon, Guilherme ; Lopes, Thiago Pama ; Beraldo, Leamar ; Kiminami, Claudio Shyinti ; Botta, Walter Jose ; Bolfarini, Claudemiro

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Research; v. 31, n. 19, p. 2987-2993, OCT 2016.
• Citações Web of Science: 5

Resumo

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. (AU)

• Processo FAPESP: 14/27073-0 - Estudo de aços inoxidáveis modificados com boro e nitrogênio visando a obtenção de materiais resistentes ao desgaste e com baixo coeficiente de atrito
• Beneficiário: Juliano Soyama
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado