POST WELD HEAT TREATMENT OF NiTinol SHAPE MEMORY ALLOY USING LASER POWER SOURCE

T. Deepan Bharathi Kannan, Govindu Tutta, P. Sathiya and T. Ramesh
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T. Deepan Bharathi Kannan: Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
Govindu Tutta: #x2020;Department of Production Engineering, National Institute of Technology, Trichy, Tamil Nadu 620015, India
P. Sathiya: #x2020;Department of Production Engineering, National Institute of Technology, Trichy, Tamil Nadu 620015, India
T. Ramesh: #x2021;Department of Mechanical Engineering, National Institute of Technology, Trichy, Tamil Nadu 620015, India

Surface Review and Letters (SRL), 2020, vol. 27, issue 06, 1-10

Abstract: In this work, attempt is made to carry out post weld heat treatment (PWHT) on NiTinol samples using laser power source. Initially, 1mm thick NiTinol sheets were welded in butt joint position using Ytterbium: Yttrium aluminum garnet (Yb: YAG) laser power source. Laser welding was carried out in continuous mode, and the quality of the weld was assessed with respect to phase transformation temperatures, microhardness, tensile strength, and corrosion resistance. To improve the quality of the welded samples, PWHT was done by passing a laser beam over the welded samples. It was found that PWHT had a significant effect on the phase transformation temperatures, microhardness, tensile strength and corrosion behavior of the welded NiTinol joints.

Keywords: NiTinol; laser welding; mechanical properties; corrosion behavior; laser heat treatment (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501609

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