Dissimilar P-TIG welding between Inconel 718 and commercially pure Titanium using niobium interlayer

Shehbaz, Tauheed, Junaid, Massab, Khan, Fahd Nawaz and Haider, Julfikar ORCID: https://orcid.org/0000-0001-7010-8285 (2022) Dissimilar P-TIG welding between Inconel 718 and commercially pure Titanium using niobium interlayer. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 236 (6). pp. 2311-2324. ISSN 0954-4089

Preview

Accepted Version
Available under License In Copyright.
Download (2MB) | Preview

Official URL: https://journals.sagepub.com/doi/full/10.1177/0954...

Abstract

The formation of brittle intermetallics is a challenge for the direct joining of commercially pure titanium (CpTi) and Inconel 718 (IN718) alloy. In the present work, dissimilar weldments using the P-TIG (Pulsed-Tungsten Inert Gas) welding technique were produced, with elemental Niobium (Nb) as an interlayer. The insertion of Nb acted as a barrier and suppressed the interdiffusion of Ti and Ni across the interlayer resulting in no TixNiy intermetallic compounds (IMCs) at the CpTi/IN718 dissimilar joint. Titanium (Ti) and Nb on CpTi side joined by solid solution (Ti, Nb) strengthening mechanism. Nickel (Ni) joined with Nb at IN718 side via eutectic reaction, where a diffused layer comprising of NbNi3, and Nb7Ni6 IMCs was found. Owing to the formation of brittle IMCs (NbNi3, Nb7Ni6), the diffused layer at Nb/IN718 interface exhibited the microhardness of ~782 HV, which is ~64 % higher than the Nb/CpTi interface and considered highest in comparison to the other regions of the joint. The maximum tensile strength of the weldment was 150 MPa, which is significantly less than CpTi (360 MPa) and IN718 (850 MPa) base alloys possibly due to the presence of cracks in the diffused layer and the welded joint.

Item Type:	Article
Peer-reviewed:	Yes
Date Deposited:	08 Apr 2022 15:33
Publisher:	SAGE Publications
Additional Information:	This is an Accepted Manuscript of an article which will appear in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, published by SAGE Publications. Users who receive access to an article through a repository are reminded that the article is protected by copyright and reuse is restricted to non-commercial and no derivative uses. Users may also download and save a local copy of an article accessed in an institutional repository for the user's personal reference.
Divisions:	Faculties > Science and Engineering
Subject terms:	Science & Technology, Technology, Engineering, Mechanical, Engineering, P-TIG welding, CpTi, Inconel 718, niobium interlayer, nanoindentation, residual stresses, mechanical properties, MECHANICAL-PROPERTIES, LASER, MICROSTRUCTURE, JOINT, ALLOY, CRACK, 0913 Mechanical Engineering
URI:	https://e-space.mmu.ac.uk/id/eprint/629415
DOI:	https://doi.org/10.1177/09544089221091388
ISSN	0954-4089
e-ISSN	2041-3009

Impact and Reach

Statistics

DownloadsShow export options

Activity Overview

6 month trend

457Downloads

6 month trend

116Hits

Additional statistics for this dataset are available via IRStats2.

Altmetric

Repository staff only

Edit record