Characterization of phases in an Fe–Mn–Si–Cr–Ni shape memory alloy processed by different thermomechanical methods

Fuster, V.; Druker, Ana Velia; Baruj, A.; Malarrı́a, J.; Bolmaro, R.E.

doi:10.1016/j.matchar.2015.09.026

Cited by 37 publications

(14 citation statements)

References 39 publications

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“…Under certain conditions, it can stabilize other phases in the microstructure such as ferrite-δ. However in the chi phase, while Mo may contribute to its formation, its cubic body-centered structure did not affect the shape memory effect and did not affect the mechanical properties [19][20][21]. Figure 1d-f illustrate that after the heat treatment, the secondary phases present in the cast condition (ferrite-δ and Chi-X phase) and the martensitic phase disappear, indicating that chemical elements dissolved and reincorporated into the austenitic matrix due to heating at high temperatures, while slow cooling led to nucleation and grain growth.…”

Section: Resultsmentioning

confidence: 94%

Characterization and Corrosion Resistance Behavior of Shape Memory Stainless Steel Developed by Alternate Routes

Dias¹,

Nakamatsu

Rovere

et al. 2019

Metals

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The microstructural characterization and corrosion resistance behavior of Fe-Mn-Si-Cr-Ni alloy with shape memory effect was studied under different mechanical processing conditions and heat treatments, which were produced using conventional casting and routing methods to reduce costs and make production viable. Microstructural characterization was performed with electron microscopy and x-ray diffraction techniques, electrochemical tests with polarization, and thermogravimetry techniques. The cast condition presented a dendritic structure and the presence of the secondary phases: ferrite-δ and Chi-X phase. The heat treatment eliminated phases, reincorporated elements in the matrix, and increased the austenitic grain. After the hot rolling process, the alloy exhibited a refined microstructure with recrystallized austenitic grains. The heat-treated condition presented better oxidation resistance than the other conditions, while the hot-rolled condition showed repassivation of the pits, raising them to higher levels. All conditions presented low corrosion resistance in environments containing chloride ions.

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Section: Resultsmentioning

confidence: 94%

Characterization and Corrosion Resistance Behavior of Shape Memory Stainless Steel Developed by Alternate Routes

Dias¹,

Nakamatsu

Rovere

et al. 2019

Metals

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“…Later, the precipitates, such as VN, Cr 23 C 6 , χ ‐phase, TiC, (Fe, Mn) 3 Si, VC, and π ‐phase were devloped to improve the SME of Fe – Mn – Si‐based SMAs. Wen et al comfirmed that lots of aligned Cr 23 C 6 particles were precipitated in the Fe–13.53Mn–4.86Si–8.16Cr–3.82Ni–0.16C alloy subjected to ageing at 1073 K after 10% tensile deformation at RT (Figure ) .…”

Section: Approaches For Improving Recovery Strains In Polycrystallinementioning

confidence: 99%

Key Factors Achieving Large Recovery Strains in Polycrystalline Fe–Mn–Si‐Based Shape Memory Alloys: A Review

et al. 2017

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Fe-Mn-Si-based shape memory alloys are the most favorable for largescale applications owing to low cost, good workability, good machinability, and good weldability. However, polycrystalline Fe-Mn-Si-based shape memory alloys have low recovery strains of only 2-3% after solution treatment, although monocrystalline ones reach a large recovery strain of %9%. This review gives an overview of the improvement of recovery strains for polycrystalline Fe-Mn-Si-based shape memory alloys. It is proposed that two fundamental aspects, that is, composition design and microstructure design, shall be satisfied for obtaining large recovery strains of above 6%. Alloying compositions determining the ceiling of recovery strains shall follow three guidelines: (i) Si content is 5-6 wt%; (ii) 20 wt% Mn 32 wt%; (iii) addition of elements strongly strengthening austenite matrix. Microstructure design includes coarsening austenitic grains and reducing twin boundaries as far as possible together with introducing a high density of stacking faults and second phases of strengthening austenite.

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“…Among these, Fe-Mn shape memory alloys present a good workability, weldability, corrosion resistance [ 14 ], large damping effect [ 15 ], recovery strain due to the shape memory effect (SME) [ 16 ] and superelasticity [ 17 , 18 ]. It has been shown that addition of Si atoms enhances reversibility of martensite and the shape memory effect in the Fe-Mn alloys [ 16 ], while the Cr addition (between 5 and 9 wt.%) improves the corrosion resistance of Fe-Mn-Si alloys [ 19 ]. The MT of Fe-Mn-Si alloys shows a particular non-thermoelastic stress-induced γ‒ε martensitic transformation and its ε‒γ reverse transformation during subsequent heating [ 10 , 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that addition of Si atoms enhances reversibility of martensite and the shape memory effect in the Fe-Mn alloys [ 16 ], while the Cr addition (between 5 and 9 wt.%) improves the corrosion resistance of Fe-Mn-Si alloys [ 19 ]. The MT of Fe-Mn-Si alloys shows a particular non-thermoelastic stress-induced γ‒ε martensitic transformation and its ε‒γ reverse transformation during subsequent heating [ 10 , 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Additionally, beside ε-martensite (hexagonal close packed—hcp—stress-induced structure), the α’-martensite (body-centred-tetragonal—bct—structure) may appear at the intersections of crystallographic defects induced by plastic deformation such as mechanical twins, stacking faults and shear bands [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the In-Situ Heat Treatment on the Martensitic Transformation and Specific Properties of the Fe-Mn-Si-Cr Shape Memory Alloys Processed by HSHPT Severe Plastic Deformation

Gurău

Ţolea

et al. 2021

Materials

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This work focuses on the temperature evolution of the martensitic phase ε (hexagonal close packed) induced by the severe plastic deformation via High Speed High Pressure Torsion method in Fe57Mn27Si11Cr5 (at %) alloy. The iron rich alloy crystalline structure, magnetic and transport properties were investigated on samples subjected to room temperature High Speed High Pressure Torsion incorporating 1.86 degree of deformation and also hot-compression. Thermo-resistivity as well as thermomagnetic measurements indicate an antiferromagnetic behavior with the Néel temperature (TN) around 244 K, directly related to the austenitic γ-phase. The sudden increase of the resistivity on cooling below the Néel temperature can be explained by an increased phonon-electron interaction. In-situ magnetic and electric transport measurements up to 900 K are equivalent to thermal treatments and lead to the appearance of the bcc-ferrite-like type phase, to the detriment of the ε(hcp) martensite and the γ (fcc) austenite phases.

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Characterization of phases in an Fe–Mn–Si–Cr–Ni shape memory alloy processed by different thermomechanical methods

Cited by 37 publications

References 39 publications

Characterization and Corrosion Resistance Behavior of Shape Memory Stainless Steel Developed by Alternate Routes

Characterization and Corrosion Resistance Behavior of Shape Memory Stainless Steel Developed by Alternate Routes

Key Factors Achieving Large Recovery Strains in Polycrystalline Fe–Mn–Si‐Based Shape Memory Alloys: A Review

The Effect of the In-Situ Heat Treatment on the Martensitic Transformation and Specific Properties of the Fe-Mn-Si-Cr Shape Memory Alloys Processed by HSHPT Severe Plastic Deformation

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