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

Autor(es)

de Carvalho, Marcos Fernandes ^[1] ; Riva, Rudimar ^[2] ; Fogagnolo, Joao Batista ^[3] ; Kiminami, Claudio Shyinti ^[1] ; Moreira Afonso, Conrado Ramos ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Engn Mat DEMa, CP 676, Rodovia Washington Luis S-N, BR-13565905 Sao Carlos, SP - Brazil

^[2] Inst Estudos Avancados IEAv, Sao Jose Dos Campos, SP - Brazil

^[3] Univ Estadual Campinas UNICAMP, FEM, Rua Mendeleyev 200, BR-13083860 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, n. 2, p. 580-587, 2017.
• Citações Web of Science: 1

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 alpha-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 alpha-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: 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: 14/13432-9 - Tratamento superficial a laser de ligas metálicas ferrosas amorfizáveis e nanocristalinas
• Beneficiário: Marcos Fernandes de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/18429-0 - Tratamento superficial a laser de ligas metálicas à base de ferro amorfizáveis e nanocristalinas
• Beneficiário: Conrado Ramos Moreira Afonso
• Modalidade de apoio: Auxílio à Pesquisa - Regular