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Nalum, D. och Timhagen, J. (2017) Study of wall thickness and its impact on microstructure on 316L manufactured with Direct Metal Laser Sintering. Göteborg : Chalmers University of Technology
BibTeX
@misc{
Nalum2017,
author={Nalum, Daniel and Timhagen, Johanna},
title={Study of wall thickness and its impact on microstructure on 316L manufactured with Direct Metal Laser Sintering},
abstract={The aim off this thesis was to theoretically and experimentally study how the microstructure of
additively manufactured 316L (stainless steel) components is affected by different wall
thicknesses. In addition, hardness and porosity are analyzed with a perspective of wall
thickness. In this study 9 different thicknesses, ranging from 0,2 mm up to 3 mm, were selected.
The structure was cut in a way so that the middle part of each wall could be observed to exclude
edge defects. The samples were analyzed with a Leica DMi8 microscope was pictures was taken
and stitched for a porosity analyses. The analysis showed a low number of pores which were
overall small. A Vickers hardness measurement was done in a Struers DuraScan to observe if
the wall thickness affected the micro hardness of the material. No significant correlation was
found and the hardness does not seem to be affected by either wall thickness, position of cross
section or edge effects. Electrochemical etching was performed to reveal the microstructure of
the material. Melt pools, solidification structure and sub-grains emerged during this process. A
more detailed investigation was conducted and the solidification structure of the material was
observed. The result shows a microstructure containing large areas of sub-grains with the same
orientation, creating a columnar solidification structure which follows the building direction.
The results indicate that the orientation of the grains is affected by the wall thickness.},
publisher={Institutionen för material- och tillverkningsteknik, Chalmers tekniska högskola},
place={Göteborg},
year={2017},
keywords={AM, SLM, DMLS, 316L, EOS, wall thickness, microstructure, sub-grains, solidification structure, hardness testing, porosity testing.},
note={52},
}
RefWorks
RT Generic
SR Electronic
ID 252831
A1 Nalum, Daniel
A1 Timhagen, Johanna
T1 Study of wall thickness and its impact on microstructure on 316L manufactured with Direct Metal Laser Sintering
YR 2017
AB The aim off this thesis was to theoretically and experimentally study how the microstructure of
additively manufactured 316L (stainless steel) components is affected by different wall
thicknesses. In addition, hardness and porosity are analyzed with a perspective of wall
thickness. In this study 9 different thicknesses, ranging from 0,2 mm up to 3 mm, were selected.
The structure was cut in a way so that the middle part of each wall could be observed to exclude
edge defects. The samples were analyzed with a Leica DMi8 microscope was pictures was taken
and stitched for a porosity analyses. The analysis showed a low number of pores which were
overall small. A Vickers hardness measurement was done in a Struers DuraScan to observe if
the wall thickness affected the micro hardness of the material. No significant correlation was
found and the hardness does not seem to be affected by either wall thickness, position of cross
section or edge effects. Electrochemical etching was performed to reveal the microstructure of
the material. Melt pools, solidification structure and sub-grains emerged during this process. A
more detailed investigation was conducted and the solidification structure of the material was
observed. The result shows a microstructure containing large areas of sub-grains with the same
orientation, creating a columnar solidification structure which follows the building direction.
The results indicate that the orientation of the grains is affected by the wall thickness.
PB Institutionen för material- och tillverkningsteknik, Chalmers tekniska högskola,PB Institutionen för material- och tillverkningsteknik, Chalmers tekniska högskola,
LA eng
LK http://publications.lib.chalmers.se/records/fulltext/252831/252831.pdf
OL 30
