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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2018
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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.
Como referenciar
KAFER, KARINE A.; BERNARDI, HEIDE H.; SANTOS, OSMAR de S.; OTUBO, LARISSA; LIMA, NELSON B. de; OTUBO, JORGE. The influence of microstructure and mechanical resistance on the shape memory of ECAE processed stainless Fe-Mn-Si-Cr-Ni-Co steel. Materials Research, v. 21, n. 5, 2018. DOI: 10.1590/1980-5373-MR-2017-0958. Disponível em: http://repositorio.ipen.br/handle/123456789/29316. Acesso em: 26 Apr 2024.
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