Effects of Carbon Content and Thermo-Mechanical Treatment on Fe&lt;SUB&gt;59&lt;/SUB&gt;Mn&lt;SUB&gt;30&lt;/SUB&gt;Si&lt;SUB&gt;6&lt;/SUB&gt;Cr&lt;SUB&gt;5&lt;/SUB&gt;C&lt;I&gt;&lt;SUB&gt;X&lt;/SUB&gt;&lt;/I&gt; (&lt;I&gt;X&lt;/I&gt;=0.015&amp;ndash;0.1 mass%) Shape Memory Alloys

Yang, Cheng‐Hsien; Lin, Hung-Yin; Lin, K.M.; Ho, Wen-Hsien

doi:10.2320/matertrans.mra2008122

Cited by 12 publications

(4 citation statements)

References 24 publications

(23 reference statements)

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“…Thirdly, the austenitic matrix may be strengthened through solid solution hardening with interstitial atoms such as carbon and nitrogen, or by dispersion hardening with second-phase precipitates. However, the effectiveness of carbon and nitrogen on the SME seems to be limited [50][51][52][53][54][55][56][57]. It is well known that the starting temperature of the thermally-induced martensitic transformation (M s ) can be significantly reduced by adding a small amount of carbon or nitrogen into Fe-Mn-Si based SMAs [53][54]57].…”

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

“…However, the effectiveness of carbon and nitrogen on the SME seems to be limited [50][51][52][53][54][55][56][57]. It is well known that the starting temperature of the thermally-induced martensitic transformation (M s ) can be significantly reduced by adding a small amount of carbon or nitrogen into Fe-Mn-Si based SMAs [53][54]57]. The deformation temperature is, in most cases, at around room temperature [50][51][52][53][54][55][56][57].…”

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

“…It is well known that the starting temperature of the thermally-induced martensitic transformation (M s ) can be significantly reduced by adding a small amount of carbon or nitrogen into Fe-Mn-Si based SMAs [53][54]57]. The deformation temperature is, in most cases, at around room temperature [50][51][52][53][54][55][56][57]. Note that a good SME is generally obtained as the deformation temperature is close to the M s [58].…”

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

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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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Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

confidence: 99%

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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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“…Clearly, the training process increases the production cost and is too cumbersome. Thermomechanical treatment-heat treatment after pre-deformation-is another effective method for improving the SME of Fe-Mn-Si-based SMAs [12][13][14][15][16]. It is much simpler than the training, evidently.…”

Section: Introductionmentioning

confidence: 99%

Role of carbon in improving the shape memory effect of Fe–Mn–Si–Cr–Ni alloys by thermo-mechanical treatments

Peng¹,

Song²,

Wang³

et al. 2015

Smart Mater. Struct.

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To clarify the role of carbon in improving the shape memory effect of Fe-Mn-Si-based shape memory alloys by thermomechanical treatments, we investigated the effect of optimum thermomechanical treatments on shape memory effect and microstructures of Fe-14Mn-5Si-8Cr-4Ni and Fe-14Mn-5Si-8Cr-4Ni-0.12C alloys. The Cr 23 C 6 particles in optimum thermomechanical-treated Fe-14Mn-5S-8Cr-4Ni-0.12C more effectively prevented collisions between stress-induced ε martensite bands than the residual α′ martensite in optimum thermomechanical-treated Fe-14Mn-5Si-8Cr-4Ni. This result is attributed to the thinner width of stress-induced ε martensite bands in optimum thermomechanical-treated Fe-14Mn-5S-8Cr-4Ni-0.12C compared to optimum thermomechanical-treated Fe-14Mn-5Si-8Cr-4Ni. In addition, the Cr 23 C 6 particles formed at more sites and provided more obstacles as compared with the residual α′ martensite. Accordingly, the recovery strain of Fe-14Mn-5Si-8Cr-4Ni-0.12C was higher than that of Fe-14Mn-5Si-8Cr-4Ni. It is concluded that carbon addition is beneficial to further improving the shape memory effect of Fe-Mn-Si-based shape memory alloys by thermomechanical treatments.

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Effect of Carbon Addition on Recovery Behavior of Trained FeMnSi Based Shape Memory Alloys

et al. 2014

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We investigate microstructures and recovery behavior of trained Fe14Mn5Si8Cr4Ni and Fe14Mn5Si8Cr4Ni0.12C alloys under different deformation strains by color optical micrographs, XRD, and SQUID. The training results in the formation of α′ martensite in Fe14Mn5Si8Cr4Ni alloy, while introduces Cr23C6 particles besides the α′ martensite in Fe14Mn5Si8Cr4Ni0.12C alloy. The stress‐induced ε martensite bands are thinner in trained Fe14Mn5Si8Cr4Ni0.12C alloy than in trained Fe14Mn5Si8Cr4Ni alloy. When the deformation strain is below 8%, the recovery strain of trained Fe14Mn5Si8Cr4Ni0.12C alloy is slightly lower than that of trained Fe14Mn5Si8Cr4Ni alloy. This result is attributed to the fact that the Ms temperature of Fe14Mn5Si8Cr4Ni0.12C alloy is much below the deformation temperature than that of Fe14Mn5Si8Cr4Ni alloy. When the deformation strain is above 8%, the recovery strain of trained Fe14Mn5Si8Cr4Ni0.12C alloy is higher than that of trained Fe14Mn5Si8Cr4Ni alloy. The reason for this result is that in trained Fe14Mn5Si8Cr4Ni0.12C alloy, both α′ martensite and Cr23C6 particles prevent stress‐induced ε martensite bands from colliding each other at large deformation strain, and the width of stress‐induced ε martensite bands is smaller as compared with trained Fe14Mn5Si8Cr4Ni alloy. It is concluded that carbon addition can improve the recovery strain of trained FeMnSi based shape memory alloys at large deformation strain.

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Effects of Carbon Content and Thermo-Mechanical Treatment on Fe<SUB>59</SUB>Mn<SUB>30</SUB>Si<SUB>6</SUB>Cr<SUB>5</SUB>C<I><SUB>X</SUB></I> (<I>X</I>=0.015–0.1 mass%) Shape Memory Alloys

Cited by 12 publications

References 24 publications

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

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

Role of carbon in improving the shape memory effect of Fe–Mn–Si–Cr–Ni alloys by thermo-mechanical treatments

Effect of Carbon Addition on Recovery Behavior of Trained FeMnSi Based Shape Memory Alloys

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