TY - JOUR
T1 - Microstructure and corrosion behavior of laser processed NiTi alloy
AU - Marattukalam, Jithin J.
AU - Singh, Amit Kumar
AU - Datta, Susmit
AU - Das, Mitun
AU - Balla, Vamsi Krishna
AU - Bontha, Srikanth
AU - Kalpathy, Sreeram K.
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/11/1
Y1 - 2015/11/1
N2 - 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.
AB - 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.
KW - Corrosion
KW - Laser engineered net shaping
KW - Laser processing
KW - Microstructure
KW - NiTi alloy
UR - http://www.scopus.com/inward/record.url?scp=84939165537&partnerID=8YFLogxK
U2 - 10.1016/j.msec.2015.07.067
DO - 10.1016/j.msec.2015.07.067
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C2 - 26354269
AN - SCOPUS:84939165537
SN - 0928-4931
VL - 57
SP - 309
EP - 313
JO - Materials Science and Engineering C
JF - Materials Science and Engineering C
M1 - 5639
ER -