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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11342
Title: Effect of post-weld heat treatment on mechanical properties and fatigue crack growth rate in welded AA-2024
Authors: Yadav V.K.
Gaur, Vidit
Singh, Indra Vir
Published in: Materials Science and Engineering A
Abstract: In this study, effect of post weld heat-treatment (PWHT) at two different aged temperatures was investigated on the microstructure and the material properties of the aluminum alloy 2024. The plates of AA2024 were welded using friction stir welding process, followed by PWHT at different aged conditions: 190°C for 10 hrs and 200°C for 10 hrs. Both tensile and cyclic properties were investigated. PWHT at 200°C–10 h resulted in significant changes in the microstructure and improvement in the mechanical properties of the welded joint. PWHT resulted in re-precipitation of the precipitates, specifically in the thermo-mechanically affected zone (TMAZ) & nugget zone (NZ) but no significant abnormal grain growth was observed in the nugget zone. A significant improvement in the ductility and the hardness of welded joint was observed for PWHT at 200°C–10 h. Long crack growth tests were conducted using sinusoidal loading of 10 Hz frequency and at a stress ratio of 0.1. The PWHT joint at 200-10 h resulted in higher threshold stress intensity factor range (ΔKth) as compared to as-welded joint and the PWHT joint at 190°C–10 h. The observations are explained based on microstructural changes in the FSW joint and are discussed in this work. © 2020 Elsevier B.V.
Citation: Materials Science and Engineering A (2020), 779(): -
URI: https://doi.org/10.1016/j.msea.2020.139116
http://repository.iitr.ac.in/handle/123456789/11342
Issue Date: 2020
Publisher: Elsevier Ltd
Keywords: Aluminum
Fatigue
Fracture
FSW
Micro-structure
PWHT
ISSN: 9215093
Author Scopus IDs: 57217039924
56229535200
57204061377
Author Affiliations: Yadav, V.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Gaur, V., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Singh, I.V., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Funding Details: The authors are thankful to the Ministry of Human Resource Department (MHRD), Government of India for funding this project.
Corresponding Author: Gaur, V.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeIndia; email: vidit.gaur@me.iitr.ac.in
Appears in Collections:Journal Publications [ME]

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