The influence of heat treatment on the thermomechanical response of Ni-rich NiTi alloys manufactured by selective laser melting

Saedi, Soheil; Turabi, Ali Sadi; Andani, Mohsen Taheri; Haberland, Christoph; Karaca, H.E.; Elahinia, Mohammad

doi:10.1016/j.jallcom.2016.03.161

Cited by 231 publications

(121 citation statements)

References 35 publications

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“…In addition to these observations, the solution annealed material demonstrate single step transformation both during cooling and heating [86,87]. Taheri Andani et al [68] and Saedi et al [35] also confirmed these observations, with showing lower transformation temperatures (approximately 20℃) and single phase transformation as the result of solution annealing. Hamilton et al [20] also studied the effect of aging conditions (400 ℃ and 500 ℃, 1-5 h) on the elementally blended Ni57Ti using LENS technique.…”

Section: The Effect Of Post-heat Treatment On the Transformation Tempmentioning

confidence: 76%

“…Hamilton et al [20] and Halani et al [49] showed that increased temperature of the aging treatment decreases the transformation temperatures. However, the results observed by Saedi et al [35] do not support this claim with showing unclear relation between the aging temperature and transformation temperatures.…”

Section: The Effect Of Post-heat Treatment On the Transformation Tempmentioning

confidence: 84%

“…Ni-rich NiTi have higher intrinsic strength in comparison with equi-atomic and Ti-rich NiTi, and therefore, they are better candidate for the applications where high superelasticity is needed [35]. It is notable that as-fabricated Ni-rich NiTi cannot fully recover the strength of the NiTi due to the nucleation of martensite in an austenite region [85].…”

Section: The Effect Of Post-heat Treatment On the Transformation Tempmentioning

confidence: 99%

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Fabrication of NiTi through additive manufacturing: A review

Elahinia

Moghaddam

Andani

et al. 2016

Progress in Materials Science

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642

228

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Nickel-titanium (NiTi) is an attractive alloy due to its unique functional properties (i.e., shape memory effect and superelasticity behaviors), low stiffness, biocompatibility, damping characteristics, and corrosion behavior. It is however a hard task to fabricate NiTi parts because of the high reactivity and high ductility of the alloy which results in difficulties in the processing and machining. These challenges altogether have limited the starting form of NiTi devices to simple geometries including rod, wire, bar, tube, sheet, and strip. In recent years, additive manufacturing (AM) techniques have been implemented for the direct production of complex NiTi such as latticebased and hollow structures with the potential use in aerospace and medical applications. It worth noting that due to the relatively higher cost, AM is considered a supplement technique for the existing. This paper provides a comprehensive review of the publications related to the AM techniques of NiTi while highlighting current challenges and methods of solving them. To this end, the properties of conventionally fabricated NiTi are compared with those of AM fabricated alloys. The critical steps toward a successful manufacturing such as powder preparation, optimum laser parameters, and fabrication chamber conditions are explained. The microstructural characteristics and structural defects, the influencing factors on the transformation temperatures, and functional properties of NiTi are highlighted to provide and overview of the influencing factors and possible controlling methods. The mechanical properties such as hardness and wear resistance, compressive behaviors, fatigue characteristics, damping and shock absorption properties are also reported. A case study in the form of using AM as a promising technique to fabricate engineered porous NiTi for the purpose of creating a building block for medical applications is introduced. The paper concludes with a section that summarizes the main findings from the literature and outlines the trend for future research in the AM processing of NiTi.

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Section: The Effect Of Post-heat Treatment On the Transformation Tempmentioning

confidence: 76%

Section: The Effect Of Post-heat Treatment On the Transformation Tempmentioning

confidence: 84%

Section: The Effect Of Post-heat Treatment On the Transformation Tempmentioning

confidence: 99%

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Fabrication of NiTi through additive manufacturing: A review

Elahinia

Moghaddam

Andani

et al. 2016

Progress in Materials Science

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642

228

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“…Relevant researches on the selective laser melting (SLM) fabricated NiTi alloy are mainly concentrated on the processing optimization with both pre-alloying powder [6][7][8][9][10][11][12][13][14][15][16][17][18] and mixed pure powders [19] as starting powder materials, the measurement of martensitic transformation temperatures [6][7][8][9][10][11][12][13][14][15][16][17][18], the detection of the stress or strain-induced martensitic transformation from different thermomechanical conditions [10,12,15,[16][17][18], the effect of post-heat treatment [10,12], evaluation of other functional properties such as the damping properties [6] and the fatigue behavior [13,14]. Based on these numerous investigations, it is worth noting that it exists large discrepancies in results, especially in terms of the final mechanical properties and shape memory effects.…”

Section: Introductionmentioning

confidence: 99%

“…As the origin of functional properties of NiTi alloy, the MT indeed plays a crucial role in the final processing and optimization. That is why the MT temperatures [6][7][8][9][10][11][12][13][14][15][16][17][18] and the critical stress inducing the martensitic transformation [10,12,15,[16][17][18] are widely investigated by most of…”

Section: Introductionmentioning

confidence: 99%

Laser beam energy dependence of martensitic transformation in SLM fabricated NiTi shape memory alloy

Yang

Zhan

et al. 2019

Materialia

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Microstructure and Mechanical Properties of NiTi Shape Memory Alloys by Laser Engineered Net Shaping

Fei

Liu

et al. 2023

Adv Eng Mater

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Herein, NiTi alloys are prepared by laser engineered net shaping (LENS) technology. By exploring the mechanical properties and microstructures of NiTi samples under different laser powers, it is concluded that NiTi alloys with a laser power of 350 W have better tensile strength (783 MPa) and strain recovery rate (59.01%). In addition, the mechanical properties and microstructure of NiTi samples with a laser power of 350 W at different aging temperatures (400–800 °C) are also explored. It is found that NiTi alloys aged at 600 °C had better tensile strength (729 MPa) and strain recovery rate (92.85%). In addition, the phase‐transition temperature and endothermic enthalpy and exothermic enthalpy of the NiTi samples after thermal treatment increased, which is attributed to the formation of stable martensite (B19′) inside the NiTi samples after thermal treatment, and the type of internal NiTi phases structure change significantly. Thermal treatment can generate Ni4Ti3, NiTi2 precipitates, and martensite (B19′) with high density of dislocations inside the NiTi samples. Herein, it is showed that LENS can prepare NiTi alloys with excellent mechanical and structural properties by controlling the equipment parameters and aging temperature.

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The influence of heat treatment on the thermomechanical response of Ni-rich NiTi alloys manufactured by selective laser melting

Cited by 231 publications

References 35 publications

Fabrication of NiTi through additive manufacturing: A review

Fabrication of NiTi through additive manufacturing: A review

Laser beam energy dependence of martensitic transformation in SLM fabricated NiTi shape memory alloy

Microstructure and Mechanical Properties of NiTi Shape Memory Alloys by Laser Engineered Net Shaping

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