Thermodynamic Calculations for the Investigation of Phase Formation in Boron-Modified Ferritic Stainless Steel

Autor(es)

Lopes, Thiago Pama ; Soyama, Juliano ; Zepon, Guilherme ; Costa Nascimento, Alexandre Romao ; Costa e Silva, Andre ; Kiminami, Claudio Shyinti ; Botta, Walter Jose ; Bolfarini, Claudemiro

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION; v. 38, n. 3, p. 343-349, JUN 2017.
• Citações Web of Science: 3

Resumo

Thermodynamic calculations in equilibrium condition were used to investigate the phase formation sequence and microstructure formation in a boron-modified ferritic stainless steel. The results were also compared with spray forming experimental heats. The thermodynamic calculations indicated that there is an eutectic point at around 1.1 wt.% B and therefore two different compositions (hypo and hypereutectic) were experimentally investigated. For the hypoeutectic composition, the primary phase to form from the melt was delta-ferrite with the boride phase M2B originating eutectically. Conversely, for the hypereutectic composition, the boride M2B was formed as the primary phase. The prediction of phase formation and stable phases at room temperature was accurate. The calculated melting temperatures showed considerable deviation from values measured by Differential Scanning Calorimetry. The final spray formed microstructure and the phase fractions were to some extent in accordance with the thermodynamic calculations. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• 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
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado