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Subsurface Residual Stress Analysis in Ti-6Al-4V Additive Manufactured Parts by Synchrotron X-ray Diffraction

Mishurova, Tatiana and Artzt, Katia Juliane and Cabeza, Sandra and Haubrich, Jan and Requena, Guillermo and Bruno, Giovanni (2018) Subsurface Residual Stress Analysis in Ti-6Al-4V Additive Manufactured Parts by Synchrotron X-ray Diffraction. European conference on non-destructive testing (ECNDT) 2018, 11.06.2018, Göteburg, Schweden.

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Official URL: http://www.ecndt2018.com/abstract/subsurface-residual-stress-analysis-in-ti-6al-4v-additive-manufactured-parts-by-synchrotron-x-ray-diffraction/

Abstract

Synchrotron X-ray diffraction is a powerful non-destructive technique for the analysis of the material stress-state. High cooling rates and heterogeneous temperature distributions during additive manufacturing lead to high residual stresses. These high residual stresses play a crucial role in the ability to achieve complex geometries with accuracy and avoid distortion of parts during manufacturing. Furthermore, residual stresses are critical for the mechanical performance of parts in terms of durability and safety. In the present study, Ti-6Al-4V bridge-like specimens were manufactured additively by selective laser melting (SLM) under different laser scanning speed conditions in order to compare the effect of process energy density on the residual stress state. Subsurface residual stress analysis was conducted by means of synchrotron X-ray diffraction in energy dispersive mode for three conditions: as-built on base plate, released from base plate, and after heat treatment on the base plate. The quantitative residual stress characterization shows a correlation with the qualitative bridge curvature method. Computed tomography (CT) was carried out to ensure that no stress relief took place owing to the presence of porosity. CT allows obtaining spatial and size pores distribution which helps in optimization of the SLM process. High tensile residual stresses were found at the lateral surface for samples in the as-built conditions. We observed that higher laser energy density during fabrication leads to lower residual stresses. Samples in released condition showed redistribution of the stresses due to distortion.

Item URL in elib:https://elib.dlr.de/122500/
Document Type:Conference or Workshop Item (Speech)
Title:Subsurface Residual Stress Analysis in Ti-6Al-4V Additive Manufactured Parts by Synchrotron X-ray Diffraction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mishurova, TatianaBAMUNSPECIFIED
Artzt, Katia JulianeKatia.Artzt (at) dlr.deUNSPECIFIED
Cabeza, SandraBAMUNSPECIFIED
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Bruno, GiovanniBAMUNSPECIFIED
Date:6 November 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Additive Manufacturing, 3D-Printing
Event Title:European conference on non-destructive testing (ECNDT) 2018
Event Location:Göteburg, Schweden
Event Type:international Conference
Event Dates:11.06.2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies, L - Fan and Compressor Technologies, L - Combustion Chamber Technologies, R - Selec ALS Druckverfahren
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Haubrich, Jan
Deposited On:30 Oct 2018 10:55
Last Modified:19 Nov 2018 10:12

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