Influence of heat treatment on the structure and martensitic transformation in NiTi alloy produced by wire arc additive manufacturing

Resnina, Natalia; Palani, I. A.; Belyaev, Sergey; Singh, Shalini; Liulchak, P.; Karaseva, U.; Prabu, S.S. Mani; Jayachandran, S. Arul; Калганов, В. Д.; Iaparova, E.; Demidova, Elena

doi:10.1016/j.mtla.2021.101238

Cited by 17 publications

(8 citation statements)

References 20 publications

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“…Thus, two types of samples were used: the T1 sample included the 2nd-4th layers and the T2 sample included the 3rd-4th layers in the working length as shown in figure 1. The samples were subjected to annealing at 450 °C for 10 h (these parameters were chosen on the basis of the results [9,12,18]). After such heat treatment, the 2nd layer contained the Ti-rich NiTi phase and coarse Ti 2 Ni precipitates on the grain boundaries which formed during manufacturing.…”

Section: Methodsmentioning

confidence: 99%

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Influence of thermocycling on the functional properties of the NiTi alloy produced by wire arc additive manufacturing

Bikbaev,

Resnina,

Anand Iyamperumal

et al. 2024

Eng. Res. Express

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The influence of the thermocycling under a stress of 200 and 300 MPa on the martensitic transformation temperatures, recoverable and irreversible strain was study in the NiTi samples produced by wire arc additive manufacturing (WAAM). Two types of samples were used: the T1 sample including the Ti-rich NiTi and Ni-rich NiTi layers in the working length and the T2 sample including only the Ni-rich NiTi layers. It was found that the variation in the martensitic transformation temperatures on thermal cycling depended on the chemical composition of the layer. The transformation temperatures decreased on thermal cycling in the Ti-rich NiTi layer (in T1 sample), whereas they were constant in the Ni-rich NiTi layers (in both T1 and T2 samples). The recoverable strain in both samples did not change during thermal cycling. The irreversible strain was found in T1 sample regardless of stress acting on thermal cycling while T2 sample showed the plastic strain only in the first cycle under 300 MPa. It was shown that the difference in a functional behavior of the T1 and T2 samples on thermocycling was due to that the T1 sample contained the Ti-rich NiTi layer, that was characterized by a low dislocation slip limit contrary to the Ni-rich layers which were hardened by the Ni4Ti3 precipitates.

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Section: Methodsmentioning

confidence: 99%

“…The WAAM is more preferable for the production of large size objects due to a high rate for the manufacturing. The properties of the NiTi samples produced by WAAM have been studying since 2019 and main results are published in [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Influence of thermocycling on the functional properties of the NiTi alloy produced by wire arc additive manufacturing

Bikbaev,

Resnina,

Anand Iyamperumal

et al. 2024

Eng. Res. Express

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“…However, challenges remain. Resnina et al, 2021 [ 123 ] observed a brittle Ti 2 Ni phase due to NiTi phase decay at grain boundaries [ 123 ]. Compositional heterogeneity exists across layers, and achieving consistent mechanical properties throughout the part remains a hurdle [ 123 ].…”

Section: Effect Of Am Technologies On the Propertiesmentioning

confidence: 99%

“…Resnina et al, 2021 [ 123 ] observed a brittle Ti 2 Ni phase due to NiTi phase decay at grain boundaries [ 123 ]. Compositional heterogeneity exists across layers, and achieving consistent mechanical properties throughout the part remains a hurdle [ 123 ]. Additionally, different layers can exhibit different phases due to varying interlayer transition temperatures, impacting superelasticity and shape memory effect across the part [ 124 ].…”

Section: Effect Of Am Technologies On the Propertiesmentioning

confidence: 99%

A Review on Additive Manufacturing Methods for NiTi Shape Memory Alloy Production

Kubášová,

Drátovská,

Losertová

et al. 2024

Materials

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The NiTi alloy, known as Nitinol, represents one of the most investigated smart alloys, exhibiting a shape memory effect and superelasticity. These, among many other remarkable attributes, enable its utilization in various applications, encompassing the automotive industry, aviation, space exploration, and, notably, medicine. Conventionally, Nitinol is predominantly produced in the form of wire or thin sheets that allow producing many required components. However, the manufacturing of complex shapes poses challenges due to the tenacity of the NiTi alloy, and different processing routes at elevated temperatures have to be applied. Overcoming this obstacle may be facilitated by additive manufacturing methods. This article provides an overview of the employment of additive manufacturing methods, allowing the preparation of the required shapes of Nitinol products while retaining their exceptional properties and potential applications.

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“…If the annealing temperature is between 600 and 750 °C, Ni4Ti2 precipitates with a low-temperature orthorhombic structure and a high-temperature tetragonal structure will form. The Ni3Ti precipitates occur with a hexagonal configuration if the ageing temperature is between 750 and 830 °C [11,12]. Recent research has shown that extending the aging time duration causes the growth of Ni4Ti3 precipitates and a subsequent decrease in dislocation density which results in reduced superelasticity in NiTi alloys [13].…”

Section: Introductionmentioning

confidence: 99%

Optimizing ageing conditions for commercial NiTi archwires: Insights from thermal phase transformation and tensile deformation analysis

Munir,

Razali,

Mahmud

et al. 2024

J. Mech. Eng. Sci.

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Superelastic nickel-titanium (NiTi) archwires are now commonly used as the standard archwire during the orthodontic alignment and levelling stage. They are preferred due to their ability to apply minimal force on teeth while allowing for a wide range of tooth movements. During orthodontic treatment, the orthodontist assesses the dimension and shape of the NiTi archwire to determine the amount and direction of force required to align misaligned teeth. The main contribution of this study is the parametric analysis and establishment of a set of optimal ageing temperatures and duration for the investigation of functionally graded nickel-titanium archwire using differential scanning calorimetry (DSC) and tensile deformation testing. The mechanical and thermal phase transformation behavior after ageing at six temperatures for duration of 15 minutes have been investigated using tensile deformation test and differential scanning calorimetry (DSC) test in this paper. Experimental results reveal that in thermal analysis as the ageing temperatures increase from 400 °C to 490 °C, the austenite finish temperature rises to a value between 9.53 °C and 35.48 °C, and subsequently decreases to 520 °C. The archwire specimen aged for temperature of 490 °C exhibited the austenite finish temperature of around 35.48 °C, and it is highest among the aged wire specimens closest to oral temperature. In tensile deformation, the ideal ageing temperature for orthodontic applications was determined to be 490 °C for 15 minutes, resulting in relatively low plateau slope 13.73 GPa with high superelatic ratio 12.04, and maximum plateau strain of 7 %.

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Influence of heat treatment on the structure and martensitic transformation in NiTi alloy produced by wire arc additive manufacturing

Cited by 17 publications

References 20 publications

Influence of thermocycling on the functional properties of the NiTi alloy produced by wire arc additive manufacturing

Influence of thermocycling on the functional properties of the NiTi alloy produced by wire arc additive manufacturing

A Review on Additive Manufacturing Methods for NiTi Shape Memory Alloy Production

Optimizing ageing conditions for commercial NiTi archwires: Insights from thermal phase transformation and tensile deformation analysis

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