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Effect of heat treatment on microstructure, corrosion, and shape memory characteristics of laser deposited NiTi alloy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Natl Inst Technol Karnataka, Dept Met & Mat Engn, Srinivasnagar PO, Mangalore 575025, India.
CSIR Cent Glass & Ceram Res Inst, Bioceram & Coating Div, 196 Raja SC Mullick Rd, Kolkata 700032, India..
CSIR Cent Glass & Ceram Res Inst, Bioceram & Coating Div, 196 Raja SC Mullick Rd, Kolkata 700032, India..
Natl Inst Technol Karnataka, Dept Mech Engn, Srinivasnagar PO, Mangalore 575025, India..
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2018 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 744, p. 337-346Article in journal (Refereed) Published
Abstract [en]

The aim of this work is to study the effect of heat treatment on the microstructure, phase transformations, shape memory characteristics and corrosion behaviour of laser deposited equiatomic NiTi alloy. Dense samples of NiTi alloy were fabricated using Laser Engineered Net Shaping (LENS T) with two different laser energy densities by varying the scan speed and laser power. These samples were annealed for 30 min at 500 degrees C and 1000 degrees C in flowing argon, followed by furnace-cooling to room temperature. The resulting microstructures and properties were compared with the corresponding as-deposited samples. Microstructural analysis after heat treatment showed needle-shape martensite in the samples processed at lower laser energy density of 20 J/mm(2), and lenticular or plate-like martensite in the samples processed at 80 J/mm(2). The XRD results revealed relatively high concentration of martensite (B190) in heat-treated NiTi alloy compared to as-processed samples. Furthermore, the heat treatment decreased the forward and reverse transformation temperatures of NiTi alloy from 80 - 95 degrees C to 20-40 degrees C, presumably due to annihilation of thermally induced defects. Interestingly, the samples annealed at 500 degrees C showed a measurable increase of 1-2% in the shape memory recovery, from the net recovery of 8% exhibited by the as-processed NiTi alloy. The corrosion resistance of laser-processed NiTi alloy decreased upon annealing.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 744, p. 337-346
Keywords [en]
Laser processing, Laser engineered net shaping, NiTi alloy, Shape memory effect, Heat treatment, Corrosion
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-351558DOI: 10.1016/j.jallcom.2018.01.174ISI: 000427513400042OAI: oai:DiVA.org:uu-351558DiVA, id: diva2:1211075
Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-05-30Bibliographically approved

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Marattukalam, Jithin J.

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