Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation

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Title: Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation
Authors: Ahn, J
He, E
Chen, L
Wimpory, RC
Dear, JP
Davies, CM
Item Type: Journal Article
Abstract: Residual stresses and distortions due to time dependent and localised heating imposed during fibre laser welding a 2.0 mm thick titanium alloy Ti-6Al-4V sheet were studied. Sequentially coupled thermo-metallurgical-mechanical simulations were performed to predict welding induced residual stresses and distortion in the fibre laser weld sample, and validated using an experimental database including weld pool geometry and temperature fields. Residual stress measurements were taken using X-ray and neutron diffraction techniques and distortion measurements were recorded using a coordinate measuring machine (CMM). The influence of thermally driven non-isothermal diffusional and diffusionless solid state phase transformations on welding residual stresses and distortions were considered in the numerical model. An internal state variables approach was used to represent the transformed volume fraction of different microstructural phases as a function of cooling rate and peak temperature, and the volumetric change due to temperature variations and phase transformations were calculated. In addition, post weld heat treatment (PWHT) as a method for reducing residual stresses was examined.
Issue Date: 23-Nov-2016
Date of Acceptance: 21-Nov-2016
URI: http://hdl.handle.net/10044/1/43907
DOI: http://dx.doi.org/10.1016/j.matdes.2016.11.078
ISSN: 0261-3069
Publisher: Elsevier
Start Page: 441
End Page: 457
Journal / Book Title: Materials & Design
Volume: 115
Copyright Statement: © 2016, Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Beijing Aeronautical Manufacturing Technology Research Institute
Funder's Grant Number: N/A
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
Residual stress
Ti-6Al-4V
Fibre laser welding
Numerical simulation
Phase transformation
Neutron diffraction
HEAT-AFFECTED ZONE
TITANIUM-ALLOYS
ALPHA-PHASE
MICROSTRUCTURAL EVOLUTION
MECHANICAL-PROPERTIES
BETA-PHASE
KINETICS
STEEL
SIMULATION
BUILDS
Materials
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering



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