Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol

被引:22
作者
Biffi, C. A. [1 ]
Bassani, P. [1 ]
Nematollahi, M. [2 ]
Moghaddam, N. Shayesteh [3 ]
Amerinatanzi, A. [3 ]
Mahtabi, M. J. [4 ]
Elahinia, M. [2 ]
Tuissi, A. [1 ]
机构
[1] CNR, Inst Condensed Matter Chem & Technol Energy CNR I, Unit Lecco, Via Previati 1E, I-23900 Lecce, Italy
[2] Univ Toledo, Dynam & Smart Syst Lab, Mech Ind & Mfg Engn Dept, 2801 W Bancroft St, Toledo, OH 43606 USA
[3] Univ Texas Arlington, Mech & Aerosp Engn, Arlington, TX 76019 USA
[4] Univ Tennessee, Dept Mech Engn, Chattanooga, TN 37403 USA
关键词
NiTi; selective laser melting; ultrasonic nano-crystal surface modification; EBSD; microstructure; XRD; MANUFACTURED NICKEL-TITANIUM; THERMOMECHANICAL RESPONSE; ALLOYS;
D O I
10.3390/ma12193068
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nitinol has significant potential for biomedical and actuating-sensing devices, thanks to its functional properties. The use of selective laser melting (SLM) with Nitinol powder can promote novel applications aimed to produce 3D complex parts with integrated functional performances. As the final step of the production route, finishing processing needs to be investigated both for the optimization of the surface morphology and the limit alteration of the Nitinol functional properties. In this work, the effect of an advanced method of surface modification, ultrasonic nanocrystal surface modification (UNSM), on the martensitic transformation and microstructure of SLM built Ni50.8Ti49.2 (at.%) was investigated. Scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry indicated that the UNSM process can generate stress-induced martensite, at least partially suppressing the martensitic transformation. The microhardness profile indicates that the UNSM process can affect the mechanical properties of the SLMed Nitinol sample in a range of up to approximately 750 mu m in depth from the upper surface, while electron backscatter diffraction analysis highlighted that the initial austenitic phase was modified within a depth below 200 mu m from the UNSMed surface.
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页数:16
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