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Residual stresses in laser direct metal deposited Waspaloy

▶ Neutron diffraction and the contour method show good agreement. ▶ Tensile stresses found parallel to the surfaces. ▶ Compressive stresses within the bulk of the structures. ▶ Residual stress weakly dependent on the laser pulse parameters. ▶ Maximum tensile residual stress unaffected across range o...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-03, Vol.528 (6), p.2288-2298
Main Authors: Moat, R.J., Pinkerton, A.J., Li, L., Withers, P.J., Preuss, M.
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cited_by cdi_FETCH-LOGICAL-c362t-469e73cd0b6692bc12670e189a9b8a1ba7d522563c4433b25869910ae8eadbc43
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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creator Moat, R.J.
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description ▶ Neutron diffraction and the contour method show good agreement. ▶ Tensile stresses found parallel to the surfaces. ▶ Compressive stresses within the bulk of the structures. ▶ Residual stress weakly dependent on the laser pulse parameters. ▶ Maximum tensile residual stress unaffected across range of pulse parameters used. This paper reports a study into the effect of laser pulse length and duty cycle on the residual stress distributions in multi-track laser direct metal deposits of Waspaloy onto an Inconel 718 substrate. The residual stresses have been evaluated using neutron diffraction and the contour method, while electron microscopy and micro hardness indentation have been used to map the concomitant microstructural variation. In all cases, near the tops of the deposited walls, the longitudinal stresses are tensile towards the mid-length of the wall, while the stresses perpendicular to the substrate are negligible. By contrast near the base of the walls, the stresses along the direction of deposition are small, while the stresses perpendicular to the substrate are compressive at the centre and tensile towards the ends. Consistent with previous observations, the stresses parallel to free surfaces are tensile, balanced by compressive stresses in the interior (an inverse quench stress profile). These profiles have been found to be weakly dependent on the laser pulse parameters, most notably an increase in tensile stress gradient with increasing duty cycle, but the maximum residual stresses are largely unaffected. Furthermore, microstructural analysis has shown that the effect of laser pulse parameters on grain morphology in multi-track thick walls is less marked than previously reported for single-track wall structures.
doi_str_mv 10.1016/j.msea.2010.12.010
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A, Structural materials : properties, microstructure and processing</title><description>▶ Neutron diffraction and the contour method show good agreement. ▶ Tensile stresses found parallel to the surfaces. ▶ Compressive stresses within the bulk of the structures. ▶ Residual stress weakly dependent on the laser pulse parameters. ▶ Maximum tensile residual stress unaffected across range of pulse parameters used. This paper reports a study into the effect of laser pulse length and duty cycle on the residual stress distributions in multi-track laser direct metal deposits of Waspaloy onto an Inconel 718 substrate. The residual stresses have been evaluated using neutron diffraction and the contour method, while electron microscopy and micro hardness indentation have been used to map the concomitant microstructural variation. 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subjects Analysing. Testing. Standards
Applied sciences
Compressive properties
Deposition
Exact sciences and technology
Laser deposition
Laser engineering net shaping (LENS)
Lasers
Metals. Metallurgy
Neutron diffraction
Nickel base alloys
Nickel-base superalloy
Rapid manufacture
Residual stress
Shape
Stress analysis
Stresses
Superalloys
Walls
title Residual stresses in laser direct metal deposited Waspaloy
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