On the Transformation Behavior of NiTi Shape-Memory Alloy Produced by SLM

被引：115

作者：

Speirs M. ^{[1
]}

Wang X. ^{[2
]}

Van Baelen S. ^{[1
]}

Ahadi A. ^{[3
]}

Dadbakhsh S. ^{[1
]}

Kruth J.-P. ^{[1
]}

Van Humbeeck J. ^{[2
]}

机构：

[1] Department of Mechanical Engineering, KU Leuven, Louvain

[2] Department of Materials Engineering, KU Leuven, Louvain

[3] National Institute for Materials Science, Tsukuba

来源：

Shape Memory and Superelasticity | 2016年 / 2卷 / 4期

关键词：

Additive manufacturing; Nickel titanium; Selective laser melting; Shape-memory effect; Transformation temperature;

D O I：

10.1007/s40830-016-0083-y

中图分类号：

学科分类号：

摘要：

Selective laser melting has been applied as a production technique of nickel titanium (NiTi) parts. In this study, the scanning parameters and atmosphere control used during production were varied to assess the effects on the final component transformation criteria. Two production runs were completed: one in a high (~1800 ppm O2) and one in a low-oxygen (~220 ppm O2) environment. Further solution treatment was applied to analyze precipitation effects. It was found that the transformation temperature varies greatly even at identical energy densities highlighting the need for further in-depth investigations. In this respect, it was observed that oxidation was the dominating factor, increased with higher laser power adapted to higher scanning velocity. Once the atmospheric oxygen content was lowered from 1800 to about 220 ppm, a much smaller variation of transformation temperatures was obtained. In addition to oxidation, other contributing factors, such as nickel depletion (via evaporation during processing) as well as thermal stresses and textures, are further discussed and/or postulated. These results demonstrated the importance of processing and material conditions such as O2 content, powder composition, and laser scanning parameters. These parameters should be precisely controlled to reach desired transformation criteria for functional components made by SLM. © 2016, ASM International.

引用

页码：310 / 316

页数：6

共 21 条

[1] Kruth J.P., Levy G., Klocke F., Childs T.H.C., Consolidation phenomena in laser and powder-bed based layered manufacturing, CIRP Ann-Manuf Technol, 56, pp. 730-759, (2007)
[2] Speirs M., Dadbakhsh S., Buls S., Kruth J., van Humbeeck J., Schrooten J., Et al., High Value Manufacturing: Advanced Research in Virtual and Rapid Prototyping: Proceedings of the 6Th International Conference on Advanced Research in Virtual and Rapid Prototyping, pp. 309-314, (2013)
[3] Habijan T., Haberland C., Meier H., Frenzel J., Wittsiepe J., Wuwer C., Et al., The biocompatibility of dense and porous nickel–titanium produced by selective laser melting, Mater Sci Eng C, 33, pp. 419-426, (2013)
[4] Gotman I., Ben-David D., Unger R.E., Bose T., Gutmanas E.Y., Kirkpatrick C.J., Mesenchymal stem cell proliferation and differentiation on load-bearing trabecular nitinol scaffolds, Acta Biomater, 9, pp. 8440-8448, (2013)
[5] Elahinia M.H., Hashemi M., Tabesh M., Bhaduri S.B., Manufacturing and processing of NiTi implants: a review, Prog Mater Sci, 57, pp. 911-946, (2012)
[6] Van Humbeeck J., Non-medical applications of shape memory alloys, Mater Sci Eng A, 273, pp. 134-148, (1999)
[7] Duerig T., Pelton A., Stockel D., An overview of nitinol medical applications, Mater Sci Eng A, 273, pp. 149-160, (1999)
[8] Frenzel J., Wieczorek A., Opahle I., Maass B., Drautz R., Eggeler G., On the effect of alloy composition on martensite start temperatures and latent heats in Ni–Ti-based shape memory alloys, Acta Mater, 90, pp. 213-231, (2015)
[9] Khalil-Allafi J., Amin-Ahmadi B., The effect of chemical composition on enthalpy and entropy changes of martensitic transformations in binary NiTi shape memory alloys, J Alloy Compd, 487, pp. 363-366, (2009)
[10] Ahadi A., Sun Q., Stress-induced nanoscale phase transition in superelastic NiTi by in situ X-ray diffraction, Acta Mater, 90, pp. 272-281, (2015)

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