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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Kafer, Karine Andrea [1] ; Bernardi, Heide Heloise [2] ; Santos, Osmar de Sousa [1] ; Otubo, Larissa [3] ; de Lima, Nelson Batista [3] ; Otubo, Jorge [1]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 21, n. 5 2018.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 09/09091-3 - Equal Channel Angular Extrusion in Stainless Shape Memory Alloys
Grantee:Heide Heloise Bernardi
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 10/20565-4 - Influnce of severe plastic deformation and intermetalic precipitates on stainless Fe-Mn-Si-Cr-Ni-Co-(Ti)with SME
Grantee:Karine Andrea Kafer
Support Opportunities: Scholarships in Brazil - Doctorate