The Influence of Microstructure and Mechanical Resistance on the Shape Memory of Ecae Processed Stainless Fe-Mn-Si-Cr-Ni-Co Steel

Autor(es)

Kafer, Karine Andrea ^[1] ; Bernardi, Heide Heloise ^[2] ; Santos, Osmar de Sousa ^[1] ; Otubo, Larissa ^[3] ; de Lima, Nelson Batista ^[3] ; Otubo, Jorge ^[1]

Afiliação do(s) autor(es)

^[1] Inst Tecnol Aeronaut, Praca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Fac Tecnol Sao Jose dos Campos Prof Jessen Vidal, Ave Cesare Mansueto Giulio Lattes 1350, BR-12247014 Sao Jose Dos Campos, SP - Brazil

^[3] Inst Pesquisas Energet & Nucl, Ave Lineu Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 21, n. 5 2018.
• Citações Web of Science: 0

Resumo

In the current work, XRD, SEM, EBSD and TEM techniques were used to evaluate the microstructure of stainless Fe-Mn-Si-Cr-Ni-Co shape memory steel processed by ECAE and annealed for one hour at temperatures ranging from 650ºC to 950ºC. The results were then correlated with the mechanical and shape-memory properties of the steel. It was observed that the samples containing large grains and a microstructure free of defects or precipitates presented a high volume fraction of multi-variant thermal martensite and stress-induced martensite, resulting in good shape recovery, owing to the memory effect. The grain refinement and precipitation of second-phase particles decreased the volume fraction and number of martensite variants and considerably increased the mechanical resistance, enhancing the elastic shape recovery. It was shown that shape memory properties were essentially related to the mechanical resistance of the matrix, which in turn was related to the microstructure. (AU)

• Processo FAPESP: 00/09730-1 - Desenvolvimento de ligas de NiTi com efeito de memória de forma
• Beneficiário: Jorge Otubo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 09/09091-3 - Extrusão em Canal Angular de Ligas Inoxidáveis com Efeito de Memória de Forma
• Beneficiário: Heide Heloise Bernardi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 10/20565-4 - Influência da deformação plástica severa e de precipitados intermetálicos em ligas inoxidáveis Fe-Mn-Si-Cr-Ni-Co-(Ti) com EMF
• Beneficiário: Karine Andrea Kafer
• Modalidade de apoio: Bolsas no Brasil - Doutorado