TY  - JOUR
A1  - Mishurova, Tatiana
A1  - Cabeza, Sandra
A1  - Thiede, Tobias
A1  - Nadammal, Naresh
A1  - Kromm, Arne
A1  - Klaus, Manuela
A1  - Genzel, Christoph
A1  - Haberland, Christoph
A1  - Bruno, Giovanni
T1  - The Influence of the Support Structure on Residual Stress and Distortion in SLM Inconel 718 Parts
JF  - Metallurgical and Materials Transactions A
N2  - The effect of support structure and of removal from the base plate on the residual stress state in selective laser melted IN718 parts was studied by means of synchrotron X-ray diffraction. The residual stresses in subsurface region of two elongated prisms in as-built condition and after removal from the base plate were determined. One sample was directly built on a base plate and another one on a support structure. Also, the distortion on the top surface due to stress release was measured by contact profilometry. High tensile residual stress values were found, with pronounced stress gradient along the hatching direction. In the sample on support, stress redistribution took place after removal from the base plate, as opposed to simple stress relaxation for the sample without support. The sample on support structure showed larger distortion compared to sample without support. We conclude that the use of a support decreases stress values but stress-relieving heat treatments are still needed.
Y1  - 2018
U6  - https://doi.org/10.1007/s11661-018-4653-9
SN  - 1073-5623
SN  - 1543-1940
VL  - 49A
IS  - 7
SP  - 3038
EP  - 3046
PB  - Springer
CY  - New York
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  -