TY  - JOUR
A1  - Thiede, Tobias
A1  - Cabeza, Sandra
A1  - Mishurova, Tatiana
A1  - Nadammal, Naresh
A1  - Kromm, Arne
A1  - Bode, Johannes
A1  - Haberland, Christoph
A1  - Bruno, Giovanni
T1  - Residual Stress in Selective Laser Melted Inconel 718
BT  - Influence of the Removal from Base Plate and Deposition Hatch Length
JF  - Materials performance and characterization
N2  - The residual stress distribution in IN718 elongated prisms produced by selective laser melting was studied by means of neutron (bulk) and laboratory X-ray (surface) diffraction. Two deposition hatch lengths were considered. A horizontal plane near the top surface (perpendicular to the building direction) and a vertical plane near the lateral surface (parallel to the building direction) were investigated. Samples both in as-built (AB) condition and removed from the base plate (RE) were characterized. While surface stress fields seem constant for the AB condition, X-ray diffraction shows stress gradients along the hatch direction in the RE condition. The stress profiles correlate with the distortion maps obtained by tactile probe measurements. Neutron diffraction shows bulk stress gradients for all principal components along the main sample directions. We correlate the observed stress patterns with the hatch length, i.e., with its effect on temperature gradients and heat flow. The bulk stress gradients partially disappear after removal from the base plate.
KW  - residual stress
KW  - IN718
KW  - neutron diffraction
KW  - laboratory x-ray diffraction
KW  - additive manufacturing
KW  - selective laser melting
KW  - coordinate measurement machine
Y1  - 2018
U6  - https://doi.org/10.1520/MPC20170119
SN  - 2379-1365
SN  - 2165-3992
VL  - 7
IS  - 4
SP  - 717
EP  - 735
PB  - American Society for Testing and Materials
CY  - West Conshohocken
ER  - 
TY  - JOUR
A1  - Mishurova, Tatiana
A1  - Cabeza, Sandra
A1  - Artzt, Katia
A1  - Haubrich, Jan
A1  - Klaus, Manuela
A1  - Genzel, Christoph
A1  - Requena, Guillermo
A1  - Bruno, Giovanni
T1  - An Assessment of Subsurface Residual Stress Analysis in SLM Ti-6Al-4V
JF  - Materials
N2  - Ti-6Al-4V bridges were additively fabricated by selective laser melting (SLM) under different scanning speed conditions, to compare the effect of process energy density on the residual stress state. Subsurface lattice strain characterization was conducted by means of synchrotron diffraction in energy dispersive mode. High tensile strain gradients were found at the frontal surface for samples in an as-built condition. The geometry of the samples promotes increasing strains towards the pillar of the bridges. We observed that the higher the laser energy density during fabrication, the lower the lattice strains. A relief of lattice strains takes place after heat treatment.
KW  - selective laser melting
KW  - additive manufacturing
KW  - heat treatment
KW  - Ti-6Al-4V
KW  - synchrotron X-ray diffraction
KW  - residual stress
Y1  - 2017
U6  - https://doi.org/10.3390/ma10040348
SN  - 1996-1944
VL  - 10
PB  - MDPI
CY  - Basel
ER  -