Relationship among grain size, annealing twins and shape memory effect in Fe–Mn–Si based shape memory alloys

Wang, Gaixia; Peng, Huabei; Zhang, Chengyan; Wang, Shanling; Wen, Yuhua

doi:10.1088/0964-1726/25/7/075013

Cited by 25 publications

(9 citation statements)

References 33 publications

(48 reference statements)

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“…In another study conducted by Murakami et al [120], ranging grain size between 20-200 μm was reported to have no clear effect on SME values [121]. Based on the outcome of the different researches mentioned above, an investigation was conducted [122] where Fe- respectively. It was found that for Fe-21.63Mn-5.60Si-9.32Cr-5.38Ni alloy, the grain size reduction causes the SME to decline.…”

Section: B) Fe and Fe-based Smasmentioning

confidence: 99%

“…In face-centred cubic (fcc) metals, deformation twinning is observed, especially when the stacking fault energy (SFE) is low to medium, after thermo-mechanical treatment involving annealing and cold working [122][123][124][125]. For high SFE elements, such as Ni and Al, twinning is rarely observed [35].…”

Section: C) Cu-and Cu-based Smasmentioning

confidence: 99%

“…Grain size, among other factors such as SFE, influence the formation of annealing twins [129]. The relationship between the density of annealing twins, the SFE and the grain size of Cu-Al and Cu-Zn where found to be inversely proportional [122]. The effect of variation of grain size (from 1 μm to smaller than 100 nm) on deformation twinning in fcc, bcc and hcp was studied experimentally by Zhu et al [131].…”

Section: C) Cu-and Cu-based Smasmentioning

confidence: 99%

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A review on shape memory metallic alloys and their critical stress for twinning

2019

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Shape Memory Alloys (SMAs) is a class of smart materials with the ability to remember the original shape. SMAs exhibit stress-induced martensitic transformation through twinning which is an important deformation mechanism that renders strength and ductility. Tailoring the capability of alloys for deformation twinning enables to optimize their mechanical performance. This paper presents a comprehensive review on the effect of internal and external parameters on the twinning propensity. Among these parameters, the effect of the composition, grain size, temperature and strain rate will be explored. In addition the use of shape memory phase as a strategy to improve the ductility of metallic use memory behaviour is of great importance to develop SMAs for multiple applications including mechanical, automotive, aerospace, civil and biomedical industries. A tentative outlook about the challenges and proposed solutions will be also discussed.

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Section: B) Fe and Fe-based Smasmentioning

confidence: 99%

Section: C) Cu-and Cu-based Smasmentioning

confidence: 99%

Section: C) Cu-and Cu-based Smasmentioning

confidence: 99%

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A review on shape memory metallic alloys and their critical stress for twinning

2019

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“…Fourthly, the formation of annealing twins should be suppressed in Fe-Mn-Si based SMAs [34,[68][69].…”

Section: Criteria Of Achieving Giant Recovery Strains In Polycrystallmentioning

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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“…The relationship between annealing twins and grain size in austenitic stainless steels continues to interest researchers due to the presence of various alloy contents in these steels. Wang et al (2016) clarified that the densities of grain boundaries and annealing twins increased with a small increase in grain sizes, which resulted in decreased shape of the memory effect in Fe-Mn-Si-based shape-memory alloys. Jin et al (2015) found that the number of annealing twin boundaries of Inconel 718 did not increase with an increase in the average grain size.…”

Section: Introductionmentioning

confidence: 99%

Effect of Prior Austenite Grain-Size on the Annealing Twin Density and Hardness in the Austenitic Stainless Steel

Anwar¹,

Melinia²,

Pradisti³

et al. 2021

IJTech

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The present study examined the effect of prior austenite grain size on twin density and hardness of austenitic stainless steels (ASS). The 253 MA and 316L ASS were subjected to multipass cold rolling to reduce thickness up to 2.3 mm. Subsequently, the rolled steels were heat treated at 1100°C at 0, 900, 1800, 2700, and 3600 seconds in a tubular furnace in a hydrogen atmosphere. At the end of the annealing time, the rolled steel was quenched in the cooled zone of the tubular furnace until it reached room temperature in a hydrogen atmosphere. Then, microstructure observation of ASS was done to identify the austenitic grain size and annealing twin, and a hardness test was performed using the micro-Vickers hardness scale. The line intercept method was used to measure the changes in 253 MA and 316L austenitic grain sizes. ImageJ software was used to measure grain size and twin length. The results showed that austenite grains of both steels grew normally; 253 MA ASS had a lower SFE and K value than 316L ASS, which indicated that 253 MA ASS had sluggish grain growth, smaller grains, more easily formed annealing twins, and higher twin density. The Hall-Petch coefficient, K', of 253 MA ASS was higher than 316L ASS, which resulted in a higher hardness value. The Sellars, Pande and Hall-Petch models were shown to predict austenite grain sizes, twin density, and hardness in 253 MA and 316L ASS.

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Relationship among grain size, annealing twins and shape memory effect in Fe–Mn–Si based shape memory alloys

Cited by 25 publications

References 33 publications

A review on shape memory metallic alloys and their critical stress for twinning

A review on shape memory metallic alloys and their critical stress for twinning

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

Effect of Prior Austenite Grain-Size on the Annealing Twin Density and Hardness in the Austenitic Stainless Steel

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