Effect of titanium addition on shape memory effect and recovery stress of training-free cast Fe–Mn–Si–Cr–Ni shape memory alloys

Wang, Gaixia; Peng, Huabei; Sun, Panpan; Wang, Shanling; Wen, Yuhua

doi:10.1016/j.msea.2016.01.099

Cited by 27 publications

(8 citation statements)

References 31 publications

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“…Even though the FSMA-B and FSMA-C have the same chemical composition, the recovery strain in the FSMA-C was 36.8% higher than the one from the FSMA-B. The growth of the recovery strain in the FSMA-C specimen was suspected to be caused by Carbon added in the FSMA-C specimen that encouraged it to have higher recovery strain [19,21]. Thus, the heat treatment in manufacturing Fe-SMA has been shown to be beneficial in imparting higher recovery strain.…”

Section: Fe-sma Behavior Under Free Restraintmentioning

confidence: 97%

“…The ultimate strain for the FSMA-B and FSMA-C specimens increased by 74.5% and 75.2% when compared to the FSMA-A specimen. The high ultimate stress and low strain in the FSMA-A specimen is considered to be the effect of dispersion hardening and grain refinement from Titanium carbide in the work hardening process [18,19]. The elastic modulus for the specimens was determined by a stress-strain curve that was in a range between 0 and 130 MPa.…”

Section: Mechanical Properties Of Fe-smamentioning

confidence: 99%

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Recovery Behavior of Fe-Based Shape Memory Alloys under Different Restraints

et al. 2020

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This paper presents the experimental results of an evaluation of the recovery behavior of Fe-based shape memory alloys (Fe-SMAs) under different restraints. For the study, three types of Fe-SMA (FSMA-A, FSMA-B, FSMA-C) were produced. As a result of the direct tensile test, the yield strength of the FSMA-A specimen was nearly 34% higher than the strength of FSMA-B and FSMA-C. Under free restraint, the recovery strains are 0.00956, 0.01445, and 0.01977 for FSMA-A, FSMA-B and FSMA-C specimens, respectively, after activation when the pre-strain is 0.04, and the heating temperature 200 °C. Under rigid restraint, the final recovery stresses are 518, 391 and 401 MPa for FSMA-A, FSMA-B, FSMA-C specimens after activation when a pre-strain of 0.04 and heating temperature 200 °C. Additionally, under the rigid restraint, the effect of pre-strain on the final recovery stress was insignificant, whereas the final recovery stress increased as the heating temperature increased. When Fe-SMA was constrained during cooling, the recovery stress is 50% lower than under rigid restraint. Hence, in order to develop a large recovery stress, Fe-SMA must be constrained during heating. In addition, a method for calculating the effective confining stress of the Fe-SMA coupler for pipe joining was proposed based on the experimental results.

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Section: Fe-sma Behavior Under Free Restraintmentioning

confidence: 97%

Section: Mechanical Properties Of Fe-smamentioning

confidence: 99%

Recovery Behavior of Fe-Based Shape Memory Alloys under Different Restraints

et al. 2020

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“…As Straumal et al [34,35] stated, the twins frequently appear in FCC metals with low-to-medium stacking fault energy. Martensite and the twins are readily observed in FeMnSiCrNi SMA since FeMnSiCrNi SMA possesses low stacking fault energy [9][10][11]. The formation mechanisms of martensite and the twins Figure 7 shows microstructures of FeMnSiCrNi SMA undergoing compression at the various strain rates at 1000 • C in the CA model, which corresponds to a true strain of 0.9.…”

Section: Microstructural Evolution Of Drxmentioning

confidence: 99%

“…Many researchers have devoted themselves to adding the alloying elements based on the FeMnSi SMAs in order to further enhance the shape memory effect or mechanical properties. The alloying elements deal with Cr, Ni, Sm, Ta, Nb, and Ti [6][7][8][9]. Among the alloying elements, the addition of Cr and Ni contributes to improving the corrosion resistance of FeMnSi SMAs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Dynamic Recrystallization of FeMnSiCrNi Shape Memory Alloy under Hot Compression Based on Cellular Automaton

Wang

Xing

Zhang

et al. 2019

Metals

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Dynamic recrystallization (DRX) takes place when FeMnSiCrNi shape memory alloy (SMA) is subjected to compression deformation at high temperatures. Cellular automaton (CA) simulation was used for revealing the DRX mechanism of FeMnSiCrNi SMA by predicting microstructures, grain size, flow stress, and dislocation density. The DRX of FeMnSiCrNi SMA has a characteristic of repeated nucleation and finite growth. The size of recrystallized grains increases with increasing deformation temperatures, but it decreases with increasing strain rates. The increase of deformation temperature leads to the decrease of the flow stress, whereas the increase in strain rate results in the increase of the flow stress. The dislocation density exhibits the same situation as the flow stress. The simulated results were supported by the experimental ones very well. Dislocation density is a crucial factor during DRX of FeMnSiCrNi SMA. It affects not only the nucleation but also the growth of the recrystallized grains. Occurrence of DRX depends on a critical dislocation density. The difference between the dislocation densities of the recrystallized and original grains becomes the driving force for the growth of the recrystallized grains, which lays a solid foundation for the recrystallized grains growing repeatedly.

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“…A range of studies have, however, showed that the recovery strains could be improved up to around 5% using training, that is, several cycles of straining at room temperature (RT) and subsequent annealing at 873-923 K [25][26][27][28]. In addition to the training, the recovery strains can be enhanced significantly by thermo-mechanical treatments (TMTs), consisting of cold-rolling/deformation at RT and subsequent annealing/aging, and the aus-forming at 973 K Fe-17.5Mn-5.29Si-9.68Cr-4.2Ni-0.09Ti alloy with small austenitic grains reached a recovery strain of just 4.5% [35]. Thus, the above results raise the question of whether coarse austenitic grains play a more crucial role than annealing twins in achieving the large recovery strains of > 6% for polycrystalline Fe-Mn-Si based SMAs.…”

Section: Introductionmentioning

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 titanium addition on shape memory effect and recovery stress of training-free cast Fe–Mn–Si–Cr–Ni shape memory alloys

Cited by 27 publications

References 31 publications

Recovery Behavior of Fe-Based Shape Memory Alloys under Different Restraints

Recovery Behavior of Fe-Based Shape Memory Alloys under Different Restraints

Investigation of the Dynamic Recrystallization of FeMnSiCrNi Shape Memory Alloy under Hot Compression Based on Cellular Automaton

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

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