TY  - JOUR
A1  - Mishurova, Tatiana
A1  - Artzt, Katia
A1  - Haubrich, Jan
A1  - Requena, Guillermo
A1  - Bruno, Giovanni
T1  - Exploring the correlation between subsurface residual stresses and manufacturing parameters in laser powder bed fused Ti-6Al-4V
JF  - Metals
N2  - Subsurface residual stresses (RS) were investigated in Ti-6Al-4V cuboid samples by means of X-ray synchrotron diffraction. The samples were manufactured by laser powder bed fusion (LPBF) applying different processing parameters, not commonly considered in open literature, in order to assess their influence on RS state. While investigating the effect of process parameters used for the calculation of volumetric energy density (such as laser velocity, laser power and hatch distance), we observed that an increase of energy density led to a decrease of RS, although not to the same extent for every parameter variation. Additionally, the effect of support structure, sample roughness and LPBF machine effects potentially coming from Ar flow were studied. We observed no influence of support structure on subsurface RS while the orientation with respect to Ar flow showed to have an impact on RS. We conclude recommending monitoring such parameters to improve part reliability and reproducibility.
KW  - residual stress
KW  - synchrotron X-ray diffraction
KW  - additive manufacturing
KW  - Ti-6Al-4V
Y1  - 2019
U6  - https://doi.org/10.3390/met9020261
SN  - 2075-4701
VL  - 9
IS  - 2
PB  - MDPI
CY  - Basel
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  -