An experimental investigation on rate dependency of thermomechanical and Stress-induced martensitic transformation behavior in Fe-28Mn-6Si-5Cr shape memory alloy under compression

Cao, Bo; Iwamoto, Takeshi

doi:10.1016/j.ijimpeng.2019.04.026

Cited by 22 publications

(10 citation statements)

References 35 publications

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“…The theoretical density was used as the material density for the simulation. Specific heat capacity and thermal conductivity at room temperature were taken from literature for the similar material Fe-28Mn-6Si-5Cr and are 544.2 J/(Kg•K) and 8.37 W/(mK), respectively [46,47] . A single-track scan was first performed on a polished material surface of similar composition.…”

Section: Simulation Of Melt Pool Thermal Propertiesmentioning

confidence: 99%

Microstructure evolution in laser powder bed fusion-built Fe-Mn-Si shape memory alloy

2023

Microstructures

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The need for specialty powder composition limits the processing of a wide range of alloy products via the laser powder bed fusion (LPBF) technique. This work extends the adaptability of the LPBF technique by fabricating the first-ever Fe-30Mn-6Si (wt.%) product for potential use as a biodegradable shape memory alloy (SMA). Different LPBF processing parameters were assessed by varying the laser power, scan speed, and the laser re-scan strategy to achieve a fully dense part. The microstructure was found to respond to the processing conditions. For example, the microstructure of the parts produced by the high linear energy density (LED) had a columnar and strong crystallographic texture, while in the low LED, the parts were almost equiaxed and had a weak texture. To explain the evolved microstructure, the thermal history of the LPBF products was computed using the finite element analysis (FEA) of the melt pool gathered from a single-track laser scan experiment. The FEA results showed a varying temperature gradient, cooling and solidification rates, and temperature profile as a function of LED. Then, the relationship of hardness between grain size, phases present, and crystallographic misorientation of the LPBFbuilt alloy was analysed with reference to a control alloy of similar composition but prepared by arc melting. This study validates the LPBF processability of Fe-Mn-Si SMA and provides a new insight into the influence of processing parameters on the formed microstructure and hardness.

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Section: Simulation Of Melt Pool Thermal Propertiesmentioning

confidence: 99%

Microstructure evolution in laser powder bed fusion-built Fe-Mn-Si shape memory alloy

2023

Microstructures

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“…The activation method is a critical technology in the process of reinforcement. At present, with the in-depth research on Fe-SMAs, the activation methods of alloys have become more abundant, including thermal resistance heating [6,32,90,[94][95][96], climate chamber heating [2,6,82,89,92,93,[96][97][98][99], flexible tape heating (Figure 8a) [100][101][102][103], infrared radiation heating [1,96,104,105], heat gun heating [3,63,91], flame heating [4], inductive coil heating [106], electric furnace heating (Figure 8b) [96,107], autoclave heating [96] and so on. In general, it is necessary to determine the specific activation method according to the characteristics of the beams and the environment.…”

Section: Reinforcement Mechanism Of Rc Bridges With Fe-smasmentioning

confidence: 99%

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

2022

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Reinforced concrete (RC) bridges often face great demands of strengthening or repair during their service life. Fe-based shape memory alloys (Fe-SMAs) as a kind of low-cost smart materials have great potential to enhance civil engineering structures. The stable shape memory effect of Fe-SMAs is generated by, taking Fe-Mn-Si alloys as an example, the martensite transformation of fcc(γ) → hcp(ε) and its reverse transformation which produces considerable recovery stress (400~500 MPa) that can be used as prestress for reinforcement of RC bridges. In this work, the mechanism, techniques, and applications of Fe-SMAs in the reinforcement of RC beams in the past two decades are classified and introduced in detail. Finally, some new perspectives on Fe-SMAs application in civil engineering and their expected evolution are proposed. This paper offers an effective active rehabilitation alternative for the traditional passive strengthening method of RC bridges.

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“…A Fe-28Mn-6Si-5Cr (Mass %) shape memory alloy was used as a selfadjustable axial preloading of ball bearings (Paleu et al, 2018). An experimental investigation on the rate dependency of thermomechanical and stressinduced martensitic transformation behavior in Fe-28Mn-6Si-5Cr shape memory alloy under compression was studied by Cao and Iwamoto (2019). They revealed that the volume fraction of stress-induced ε-martensite under compression becomes smaller than that under tension.…”

Section: Introductionmentioning

confidence: 99%

“…In the unloading process of compression, a higher strain rate dependency of temperature change was obtained. Finally, by changing the compressive strain rate under quasi-static level, the ratio of shape recovery can be improved to 7.14 % due to the opposite rate dependency of the ratio of shape recovery can be obtained under tensile and compressive stress (Cao and Iwamoto, 2019).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of nanostructured Fe–28Mn–6Si–5Cr shape memory alloy

al.¹

2022

Int. j. adv. appl. sci.

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Mechanical alloying and consequent sintering techniques were used to create a bulk alloy of Fe–28Mn–6Si–5Cr from elemental powder. The microstructure and shape memory behavior due to bending deformation were investigated. The majority of α phases that existed at the start of the mechanical alloying process were changed into γ phases by the end of the 40-hour process. The γ phase was essential to achieving shape recovery behavior, which was boosted by mechanical alloying. A stress-induced γ to ε phase transformation occurred at the end of the bending deformation process. Shape recovery was observed after the subsequent heat treatment process due to reverse martensitic ε to γ phase transformation. After mechanical alloying, a grain size of 9.5 nm was attained and a considerable amount of shape recovery was achieved at the end of the recovery heat-treatment process. As a result, we came to the conclusion that combining mechanical alloying with powder metallurgy and then sintering has the potential to synthesize Fe-Mn-Si-Cr shape memory alloy.

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An experimental investigation on rate dependency of thermomechanical and Stress-induced martensitic transformation behavior in Fe-28Mn-6Si-5Cr shape memory alloy under compression

Cited by 22 publications

References 35 publications

Microstructure evolution in laser powder bed fusion-built Fe-Mn-Si shape memory alloy

Microstructure evolution in laser powder bed fusion-built Fe-Mn-Si shape memory alloy

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

Fabrication and characterization of nanostructured Fe–28Mn–6Si–5Cr shape memory alloy

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