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(Referência obtida automaticamente do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Metallic Glass Formation Upon Rapid Solidification of Fe60Cr8Nb8B24 (at%) Alloy through LASER Cladding and Remelting

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Autor(es):
Marcos Fernandes de Carvalho ; Rudimar Riva ; João Batista Fogagnolo ; Cláudio Shyinti Kiminami ; Conrado Ramos Moreira Afonso
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, p. -, 2017.
Resumo

Fe60Cr8Nb8B24 (at%) amorphous powder and ingot were submitted to LASER cladding and remelting process, respectively. Fe-based coatings were produced using different LASER processing parameters and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers microhardness. All coatings obtained by LASER cladding (LC) and layers obtained by LASER surface remelting (LSR) with shorter and median interaction times (scanning speeds of 16.7 and 66.7mm/s), irrespective of overlap value, presented peaks of the crystalline phases α-Fe, Fe2B and the FeNbB intermetallic. In addition, layers obtained by LSR with shorter interaction time (150mm/s), in general, presented only peaks of the α-Fe and Fe2B phases, except that produced with overlap value of 20%, more amorphous. SEM results showed that, regardless of LASER process, the coatings presented cracks, some pores and FeNbB intermetallic phase. All coatings obtained by LC and that obtained with shorter interaction time, by LSR, showed a Vickers microhardness, 1086 to 1329HV and 2161 to 2294HV, respectively, significantly higher than the substrates, AISI steel: 170HV and Fe-Cr-Nb-B: 1921HV. (AU)

Processo FAPESP: 12/18429-0 - Tratamento superficial a laser de ligas metálicas à base de ferro amorfizáveis e nanocristalinas
Beneficiário:Conrado Ramos Moreira Afonso
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
Beneficiário:Claudio Shyinti Kiminami
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/13432-9 - Tratamento superficial a laser de ligas metálicas ferrosas amorfizáveis e nanocristalinas
Beneficiário:Marcos Fernandes de Carvalho
Linha de fomento: Bolsas no Brasil - Pós-Doutorado