Effect of carbon content on shape memory effect of Fe-Mn-Si-Cr-Ni-based alloys at different deformation temperatures

Chen, J.; Peng, Huabei; Yang, Qian; Wang, S.L.; Song, Fan; Wen, Yuhua

doi:10.1016/j.msea.2016.09.006

Cited by 33 publications

(7 citation statements)

References 29 publications

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“…At higher magnification (Figure 1b), not only the γ-austenite grains but also the stress-induced ε-martensite plates can be clearly distinguished, appearing as parallel dark lines inside the γ-austenite grains. The coexistence of both phases was corroborated by X-ray diffraction measurements in agreement with the observations of other researchers [6,9,27]. This structure is perceived with more detail in Figure 2.…”

Section: Microstructural Characterizationsupporting

confidence: 91%

“…Twins and slip bands are clearly visible, a characteristic feature of dislocation motion. In addition, the presence is noticeable of large inclusions that are heterogeneously distributed all over the sample, although there is a higher accumulation in the central zone of the specimen; The coexistence of both phases was corroborated by X-ray diffraction measurements in agreement with the observations of other researchers [6,9,27]. This structure is perceived with more detail in Figure 2.…”

Section: Microstructural Characterizationsupporting

confidence: 87%

“…They are specially suitable for applications that require high shape memory stress, i.e., constrained recovery applications; typical examples are pipe joins, rail couplings or pre-stressing reinforcing elements in civil engineering [2][3][4]. The SME in Fe-Mn-Si alloy systems was discovered by Sato et al in 1982 [5]; different alloying elements were subsequently added to improve this SME, making the systems more suitable for structural applications [6][7][8]. Nowadays, research in this field is growing, in order to obtain smart materials which are more competitive for civil engineering purposes.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Thermomechanical Characterization of Fe-28Mn-6Si-5Cr Shape Memory Alloy

Collazo

Figueroa

Mariño-Martínez

et al. 2021

Metals

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Iron-based shape memory alloys (SMAs) have been widely studied during the last years, producing new formulations with potential applications in civil engineering. In the present paper, the microstructure and the thermomechanical behavior of the Fe-28Mn-6Si-5Cr memory alloy has been investigated. At room temperature, the presence of e-martensite and g-austenite was confirmed using optical and electron microscopy techniques. The martensitic transformation temperatures (As, Af, Ms, and Mf) were determined by differential scanning calorimetry, together with an X-ray diffraction technique. The use of these techniques also confirmed that this transformation is not totally reversible, depending on the strain degree and the number of thermal cycles. From the kinetics study of the e ® g transformation, the isoconversion curves (transformation degree versus time) were built, which provided the information required to optimize the thermal activation cycle. Tensile tests were performed to characterize the mechanical properties of the studied alloy. These kinds of tests were also performed to assess the shape memory effect, getting a recovery stress of 140 MPa, after a 7.6% pre-strain and a thermal activation up to 160 °C.

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Section: Microstructural Characterizationsupporting

confidence: 91%

Section: Microstructural Characterizationsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and Thermomechanical Characterization of Fe-28Mn-6Si-5Cr Shape Memory Alloy

Collazo

Figueroa

Mariño-Martínez

et al. 2021

Metals

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“…This transformation mainly follows the sequences from γ-austenite to ε-martensite and from γ-austenite to ε-martensite to α ′ -martensite. Notably, α ′ -martensite results from the transformation of ε-martensite under external force, not a direct transition from γ-austenite [35,36]. Moreover, by comparing the height of the strongest peak for each phase in the X-ray diffraction, we can qualitatively determine that after substantial deformation, the alloy primarily contains the martensitic phase, with a higher content of α ′ -martensite than ε-martensite.…”

Section: Mechanical and Shape Memory Propertiesmentioning

confidence: 91%

Laser-Directed Energy Deposition of Fe-Mn-Si-Based Shape Memory Alloy: Microstructure, Mechanical Properties, and Shape Memory Properties

Liu,

Yao,

Kang

et al. 2023

Materials

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Fe-Mn-Si shape memory alloys (SMAs) have gained significant attention due to their unique characteristics. However, there remains a gap in the literature regarding the fabrication of these alloys using laser-directed energy deposition (LDED). This study fills this void, investigating the properties of Fe-Mn-Si SMAs produced by LDED. The shape memory performance of as-deposited Fe-Mn-Si SMAs was studied using a tensile method. Alloys underwent different degrees of deformation to assess their shape memory effect. Microstructural evaluations were conducted post-deformation to observe the internal structures of the alloys. The tensile tests revealed that shape recovery rates for deformation levels of 3%, 7%, 11%, and 15% were 68.1%, 44.2%, 31.7%, and 17.6%, respectively. Notably, the maximum recoverable deformation of the LDED-formed Fe-Mn-Si-based shape memory alloy reached 3.49%, surpassing the traditional deformation processing SMAs (<3%). The presence of a significant number of stacking faults was linked to the enhanced shape memory performance. The LDED technique demonstrates promising potential for the fabrication of Fe-Mn-Si SMAs, producing alloys with enhanced shape memory performance compared to traditionally processed SMAs. The study’s findings offer new insights and broaden the applicability of LDED in the field of SMAs.

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“…As a result, the improvement of the SME is limited, and the SME may even deteriorate after the addition of carbon and nitrogen. Recently, it was found that the shape recovery ratio increased from 42% at a deformation temperature of 293 K to 81% at a deformation temperature of 77 K when the deformation strain was 3.7% in the processed Fe-17Mn-5.5Si-9Cr-5.5Ni-0.12C alloy subjected to solution treatment at 1373 K for 30 min [59]. This result clearly revealed that the addition of interstitial atoms can improve the SME of Fe-Mn-Si based SMAs radically, since the proper deformation temperature is selected.…”

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

Key criterion for achieving giant recovery strains in polycrystalline Fe-Mn-Si based shape memory alloys

Peng

Wang

et al. 2018

Materials Science and Engineering: A

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In this study, it is proposed that coarsening austenitic grains is a key criterion for achieving giant recovery strains in polycrystalline Fe-Mn-Si based shape memory alloys. In order to verify the hypothesis, the relationship between recovery strains and austenitic grain-sizes in cast and processed Fe-Mn-Si based shape memory alloys was investigated. The recovery strain of cast Fe-19Mn-5.5Si-9Cr-4.5Ni alloy with the coarse austenitic grains of 652 μm reached 7.7% while the recovery strain of one with the relatively small austenitic grains of 382 μm was only 5.4%. Moreover, a recovery strain of 5.9%, which is the highest previously published value for solution-treated processed Fe-Mn-Si based shape memory alloys, was obtained by coarsening the austenitic grains through only solution treatment at 1483 K for 360 min in a processed Fe-17Mn-5.5Si-9Cr-5.5Ni-0.12C alloy. However, its recovery strain was still 5.9% after thermo-mechanical treatment consisting of 10% tensile strain at room temperature and annealing at 1073 K for 30 min. This happens because annealing twins play a negative role, refining the austenitic grains, limiting the recovery strains to below 6%. In summary, coarse austenitic grains enable the achievement large recovery strains by two mechanisms. Firstly, the grains are bigger, and consequently there are fewer grain boundaries, and thus their suppressive effects of grain boundaries on stress-induced ε martensitic transformation is reduced. Secondly, coarse austenitic grains are advantageous to introduce  martensite with single orientation and reduce the collisions of different martensite colonies, especially when the deformation strain is large. As such, the ceiling of recovery strains is dependent on the austenitic grain-sizes.

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Effect of carbon content on shape memory effect of Fe-Mn-Si-Cr-Ni-based alloys at different deformation temperatures

Cited by 33 publications

References 29 publications

Microstructure and Thermomechanical Characterization of Fe-28Mn-6Si-5Cr Shape Memory Alloy

Microstructure and Thermomechanical Characterization of Fe-28Mn-6Si-5Cr Shape Memory Alloy

Laser-Directed Energy Deposition of Fe-Mn-Si-Based Shape Memory Alloy: Microstructure, Mechanical Properties, and Shape Memory Properties

Key criterion for achieving giant recovery strains in polycrystalline Fe-Mn-Si based shape memory alloys

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