Marattukalam, Jithin J and Singh, Amit Kumar and Datta, Susmit and Das, Mitun and Balla, Vamsi Krishna and Bontha, Srikanth and Kalpathy, Sreeram K (2015) Microstructure and corrosion behavior of laser processed NiTi alloy. Materials Science & Engineering C-Materials for Biological Applications, 57. pp. 309-313. ISSN 0928-4931

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Laser Engineered Net Shaping (LENS), a commercially available additive manufacturing technology, has been used to fabricate dense equiatomic NiTi alloy components. The primary aim of this work is to study the effect of laser power and scan speed on microstructure, phase constituents, hardness and corrosion behavior of laser processed NiTi alloy. The results showed retention of large amount of high-temperature austenite phase at room temperature due to high cooling rates associated with laser processing. The high amount of austenite in these samples increased the hardness. The grain size and corrosion resistance were found to increase with laser power. The surface energy of NiTi alloy, calculated using contact angles, decreased from 61 mN/m to 56 mN/m with increase in laser energy density from 20 J/mm(2) to 80 J/mm(2). The decrease in surface energy shifted the corrosion potentials to nobler direction and decreased the corrosion current. Under present experimental conditions the laser power found to have strong influence on microstructure, phase constituents and corrosion resistance of NiTi alloy. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Engineering Materials
Divisions: Bioceramics & Coating
Depositing User: Bidhan Chaudhuri
Date Deposited: 31 Dec 2015 06:47
Last Modified: 31 Dec 2015 06:47

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