Thermo‐Mechanical Properties of an Fe–Mn–Si–Cr–Ni–VC Shape Memory Alloy with Low Transformation Temperature

Leinenbach, Christian; Kramer, Hendrik; Bernhard, Christian; Eifler, Dietmar

doi:10.1002/adem.201290004

Cited by 13 publications

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“…It can be observed that the behavior during unloading deviates from Hook's law since the stress-strain curve during unloading does not follow a linear course. This curved progression indicates the socalled pseudo-elastic effect and has been reported already in [8,10]. When the stress is released, a part of the martensite is not stable anymore at room temperature and transforms spontaneously back into austenite.…”

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confidence: 57%

“…Recently, some of the present authors reported that Fe-SMAs with finely dispersed VC particles have very promising properties for commercial civil engineering applications, in particular a very high recovery stress after heating to only 160 °C, high fatigue strength as well as a high resistance against corrosion [7][8][9][10]. In a feasibility study, the Fe-SMA strips ( Figure 1) were used to prestress concrete bars by having been centrally embedded [11].…”

Section: Introductionmentioning

confidence: 95%

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Development of Rolling Technology for an Iron-Based Shape-Memory-Alloy

Leinenbach¹,

Czaderski²,

Michels³

et al. 2016

MSF

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Abstract. Low cost Fe-Mn-Si based shape memory alloys (SMA) have drawn much attention during the last two decades as a cost-effective alternative to the expensive Ni-Ti based SMA. In particular, the alloy Fe-17Mn-5Si-10Cr-4Ni-1(V,C) (mass%), which has been developed at Empa shows very promising properties with regard to potential commercial applications in civil and mechanical engineering. This alloy has a higher reverse transformation temperature and larger thermal hysteresis in comparison to the Ni-Ti based alloys, which is adequate for producing stable recovery stresses at room temperature. Furthermore, recovery stresses of up to 300 MPa after heating to only 160 °C can be achieved without so-called 'training' treatment. Furthermore, the alloy can be easily and cost effectively produced under standard air melting and casting conditions. For availability of these heavily microstructure dependent skills for civil and mechanical engineering, e.g. as prestressing elements in concrete structures or coupling/clamping devices, a process chain for manufacturing is necessary. Therefore, a hot and cold rolling technology for strip production with thermal heat treatment processes was developed at TU Bergakademie on base of experimental simulation results. The last one helps to understand the dependencies of deformation parameters, the deformation behavior and their influence to the microstructure evolution in correlation to the recovery. This paper discusses the basic material properties, recovery stress formation behavior and finally the feasibility of the alloy as reinforcing elements in civil engineering applications by using a rolling technology for flat products. IntroductionShape memory alloy (SMA) steels based on the Fe-Mn-Si alloy system are promising candidates for a variety of advanced civil engineering applications, since they have a wide transformation hysteresis, high elastic stiffness and strength and are relatively inexpensive to produce [1]. These advantages make them promising as a cost-effective alternative to conventional NiTi-based SMAs for applications requiring high shape memory stresses, e.g. constrained recovery applications such as external confinement for reinforced concrete columns [2] or as prestressing reinforcement in prestressed concrete [3;4].The shape memory effect in Fe-Mn-Si alloys is a result of a mechanically induced phase transformation from austenite (face centered cubic phase, γ) to martensite (hexagonal close packed phase, ε) and its reversion upon heating [5]. Under pure mechanical loading, stress induced martensite forms and the resulting strain can exceed the elastic strain limit of the alloy. This strain can be recovered by the reverse transformation due to the same crystallographic path of the two transformations [6].

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confidence: 57%

Section: Introductionmentioning

confidence: 95%

Development of Rolling Technology for an Iron-Based Shape-Memory-Alloy

Leinenbach¹,

Czaderski²,

Michels³

et al. 2016

MSF

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“…promising properties with regard to potential commercial applications: high recovery stresses of up to 500 MPa after heating to only 130°C and without 'training', and production under standard air melting and casting condition [6][7][8][9]. In a previous investigation [9], the possible level of recovery stress and the influence of cyclic loading on the recovery stress were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…However, applications for large civil structures or structural elements have been limited by the high costs of raw materials and the processing, which usually requires high vacuum conditions. As an alternative, Fe-based SMAs (Fe-SMAs) such as Fe-Mn-Si-based alloys seem to be more favorable for this kind of application due to their lower costs [5][6][7][8][9]. In particular the alloy Fe-17Mn-6Si-10Cr-4Ni-1VC which has been developed previously by some of the present authors shows very http://dx.doi.org/10.1016/j.conbuildmat.2015.07.098 0950-0618/Ó 2015 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Recovery stress formation in a restrained Fe–Mn–Si-based shape memory alloy used for prestressing or mechanical joining

Lee

Weber

Leinenbach

2015

Construction and Building Materials

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“…Unfortunately, Ti-Ni-based alloys are very expensive owing to their low productivity and the high-cost fabrication caused by the expensive alloy ingredients and their low cold workability 4 . Therefore, low-cost polycrystalline shape memory steels (SMSs), such as Fe-Mn-Si [5][6][7][8][9][10][11][12][13][14][15] , Fe-Ni-C 16 and Fe-Ni-Co-Ti [17][18][19] , have been developed. Recently, a major breakthrough in the superelasticity has been made in the polycrystalline SMSs.…”

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Large recovery strain in Fe-Mn-Si-based shape memory steels obtained by engineering annealing twin boundaries

et al. 2014

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Shape memory alloys are a unique class of materials that can recover their original shape upon heating after a large deformation. Ti-Ni alloys with a large recovery strain are expensive, while low-cost conventional processed Fe-Mn-Si-based steels suffer from a low recovery strain (o3%). Here we show that the low recovery strain results from interactions between stress-induced martensite and a high density of annealing twin boundaries. Reducing the density of twin boundaries is thus a critical factor for obtaining a large recovery strain in these steels. By significantly suppressing the formation of twin boundaries, we attain a tensile recovery strain of 7.6% in an annealed cast polycrystalline Fe-20.2Mn-5.6Si-8.9Cr-5.0Ni steel (weight%). Further attractiveness of this material lies in its low-cost alloying components and simple synthesis-processing cycle consisting only of casting plus annealing. This enables these steels to be used at a large scale as structural materials with advanced functional properties.

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Thermo‐Mechanical Properties of an Fe–Mn–Si–Cr–Ni–VC Shape Memory Alloy with Low Transformation Temperature

Cited by 13 publications

References 0 publications

Development of Rolling Technology for an Iron-Based Shape-Memory-Alloy

Development of Rolling Technology for an Iron-Based Shape-Memory-Alloy

Recovery stress formation in a restrained Fe–Mn–Si-based shape memory alloy used for prestressing or mechanical joining

Large recovery strain in Fe-Mn-Si-based shape memory steels obtained by engineering annealing twin boundaries

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