Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Lee, Wookjin; Partovi‐Nia, Raheleh; Suter, Thomas; Leinenbach, Christian

doi:10.1002/maco.201508701

Cited by 36 publications

(22 citation statements)

References 38 publications

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“…This alloy has been designed for use in civil engineering and therefore has comparably low transformation temperatures [18]. It has been studied extensively with regard to its microstructure, shape memory properties with a special emphasize on shape recovery stresses under mechanical constraints, static and cyclic materials properties and corrosion behavior [26][27][28][29]. The goals of the present study are to describe the influence of carbide precipitates on the fcc to hcp transformation for this particular master alloy composition, to study the fcc to hcp transformation as a function of the grain orientation and potentially resulting load transfers between different grain families and to shed light on the general microstructural mechanisms of pseudo-elasticity.…”

Section: X-ray and Neutron Diffraction Provide Phase Selective Informmentioning

confidence: 99%

Characterization of the deformation and phase transformation behavior of VC-free and VC-containing FeMnSi-based shape memory alloys by in situ neutron diffraction

Leinenbach

Arabi-Hashemi

Lee

et al. 2017

Materials Science and Engineering: A

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The stress-induced fcc-austenite to hcp-martensite transformation in the iron based shape memory alloy (SMA) Fe-17Mn-5Si-10Cr-4Ni with and without VC precipitates is investigated by in-situ neutron diffraction measurements upon uniaxial loading and unloading. Based on experimentally derived elastic moduli the critical resolved shear stress (CRSS) for the fcc to hcp phase transformation was calculated. VC precipitates promote the martensite transformation by shifting the CRSS from 152 MPa to 85 MPa. A nearly perfect plastic behavior is found for the (220) grains with a high Schmid factor of 0.47. While (220), (111) and (200) oriented grains exhibit a phase transformation, (311) grains plastically deform solely by slip. During plastic deformation a load redistribution from soft behaving (220) grains to hard behaving (200) orientated grains takes place. The presence of VC precipitates leads to a broadening of the stress interval at which a martensite transformation is induced. This is explained by spatially heterogeneously distributed martensite transformation temperatures which are caused by VC precipitates. The microstructural reason for pseudo-elasticity is found to be a combination of back transformation from hcp to fcc and a reversible motion of Shockley partial dislocations.

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Section: X-ray and Neutron Diffraction Provide Phase Selective Informmentioning

confidence: 99%

Characterization of the deformation and phase transformation behavior of VC-free and VC-containing FeMnSi-based shape memory alloys by in situ neutron diffraction

Leinenbach

Arabi-Hashemi

Lee

et al. 2017

Materials Science and Engineering: A

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“…However, the chloride concentration in seawater can be up to 0.6 M, which is why HRB400 steel cannot be directly used in seawater concrete. When the concentration of chloride is between 0.1 and 0.2 M, the passive film initially formed on the surface of the steel rebar is unstable and may lead to pitting corrosion in the future . Therefore, the tolerance threshold of steel rebar to mixed‐in chloride during the concrete curing stage is only 0.05 M. Limiting the concentration of mixed‐in chloride ions in curing concrete to no more than 0.05 M is a reasonable guideline for applying HRB400 steel in marine sand concrete.…”

Section: Resultsmentioning

confidence: 99%

Application feasibility of HRB400 steel in seawater and marine sand concrete

Shang

2018

Materials & Corrosion

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Due to the shortage of fresh water and river sand in coastal areas, seawater, and marine sand sometimes must be used in the preparation of concrete for construction. Thus, the corrosion of steel rebar in seawater and marine sand concrete cannot be ignored. In this study, the feasibility of using HRB400 steel in seawater and marine sand concrete was determined based on steel rebar corrosion. Electrochemical methods were used to investigate the passivation and depassivation of HRB400 steel in curing and inservice concrete, respectively, and to determine conditions for forming a stable passive film and the critical chloride threshold for the steel depassivation. Our experimental results demonstrate that HRB400 steel cannot be directly applied in seawater concrete but may be used in marine sand concrete when the concentration of mixed-in chloride is no more than 0.05 M because low concentrations of mixed-in chloride had no effect on the properties of the passive film. K E Y W O R D S critical chloride threshold, HRB400 steel, passivation behavior, seawater and marine sand concrete 1478 |

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“…The recovery stress ranging from 130 to 580 MPa has been reported with various heating temperatures between 130 and 580 °C on different Fe-SMAs [ 11 ]. It has been shown that Fe-SMA has good fatigue [ 12 ] and corrosion resistance [ 13 ], making it even more attractive in structural applications.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory and Mechanical Properties of Cold Rolled and Annealed Fe-17Mn-5Si-5Cr-4Ni-1Ti-0.3C Alloy

et al. 2021

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In the present study, the shape, memory, and mechanical properties of cold-rolled and annealed Fe-17Mn-5Si-5Cr-4Ni-1Ti-0.3C (wt.%) alloy were investigated. The cold-rolled alloy was annealing heat-treated at different temperatures in the range of 500–900 °C for 30 min. The shape recovery behavior of the alloy was investigated using strip bending test followed by recovery heating. The microstructural evolution and the stress-strain response of the alloy heat-treated at different temperatures revealed that the recovery took place at a heat-treatment temperature higher than 600 °C. Recrystallization occurred when the heat-treatment temperature was higher than 800 °C. Meaningful shape recovery was observed only when the alloy was annealed at temperatures higher than 600 °C. The highest recovery strain of up to 2.56% was achieved with a pre-strain of 5.26% and recovery heating temperature of 400 °C, when the alloy was heat-treated at 700 °C. Conversely, the yield strength reduced significantly with increasing annealing heat-treatment temperature. The experimental observations presented in this paper provide a guideline for post-annealing heat-treatment when a good compromise between mechanical property and shape recovery performance is required.

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Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Cited by 36 publications

References 38 publications

Characterization of the deformation and phase transformation behavior of VC-free and VC-containing FeMnSi-based shape memory alloys by in situ neutron diffraction

Characterization of the deformation and phase transformation behavior of VC-free and VC-containing FeMnSi-based shape memory alloys by in situ neutron diffraction

Application feasibility of HRB400 steel in seawater and marine sand concrete

Shape Memory and Mechanical Properties of Cold Rolled and Annealed Fe-17Mn-5Si-5Cr-4Ni-1Ti-0.3C Alloy

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