Microstructure and corrosion behavior of laser processed NiTi alloy

Jithin J. Marattukalam, Amit Kumar Singh, Susmit Datta, Mitun Das, Vamsi Krishna Balla*, Srikanth Bontha, Sreeram K. Kalpathy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Abstract 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/mm2 to 80 J/mm2. 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.

Original languageEnglish
Article number5639
Pages (from-to)309-313
Number of pages5
JournalMaterials Science and Engineering C
StatePublished - 1 Nov 2015
Externally publishedYes


  • Corrosion
  • Laser engineered net shaping
  • Laser processing
  • Microstructure
  • NiTi alloy


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