EFFECT OF HEAT INPUT AND POST WELD HEAT TREATMENT ON THE PHASE TRANSFORMATION TEMPERATURE OF TIG-WELDED NiTinol SHEETS

Samson R Manoj and Kannan T Deepan Bharathi
Additional contact information
Samson R Manoj: Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu District, Tamilnadu, India-603203, India
Kannan T Deepan Bharathi: Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu District, Tamilnadu, India-603203, India

Surface Review and Letters (SRL), 2021, vol. 28, issue 12, 1-9

Abstract: NiTinol Shape Memory Alloys (SMA) are becoming one of the ideal choices for biomedical industries due to their unique properties such as Shape Memory Effect (SME), Super Elasticity (SE) and Biocompatibility. In the process of making complicated biomedical implants, welding processes play a vital role. In this work, an attempt was made to study the effect of heat input and Post Weld Heat Treatment (PWHT) on the TIG-welded NiTinol SMA. TIG welding was carried out on 1-mm thick NiTinol sheets. With increase in heat input, there was a significant variation in Phase Transformation Temperature (PTT) of welded samples. The variation in PTT is attributed to the formation of intermetallic phases such as Ti2Ni, Ni3Ti and NiTiO3 and coarse grain formation. Electron Back Scattered Diffraction (EBSD) analysis on the weld revealed that the average grain size of parent material was increased from 9.92851μm to 48.292345μm after the welding process. The PWHT was carried out on the best weld characteristic sample. PWHT did not produce significant effect on PTT. Austenite start and finish temperature slightly decreased after PWHT, whereas slight drift towards the positive side was noticed in martensite start and finish temperature.

Keywords: NiTinol; TIG welding process; shape memory effect; PWHT (search for similar items in EconPapers)
Date: 2021
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X21501146
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:28:y:2021:i:12:n:s0218625x21501146

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X21501146

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().