Solidification SLM

dendritic solidification, eutectics, peritectics,....
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male
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Solidification SLM

Post by male » Tue Feb 05, 2019 12:06 pm

Hi,

I try to simulate the grain evolution during SLM Process. Is it possible to use EBSD pictures to create the substrate layer? And if it's possible can I consider different grain orientations in that substrate layer?


BR Maike

ralph
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Re: Solidification SLM

Post by ralph » Tue Feb 05, 2019 1:57 pm

Hi Maike,

there is no direct input of EBSD data in MICRESS.
See here https://web.micress.de/forum/viewtopic. ... ebsd#p2580

Best,
Ralph

male
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Re: Solidification SLM

Post by male » Tue Feb 05, 2019 2:31 pm

Thank you for the quick response.
I have seen in the user guide that it is possilbe to draw the boundaries ( i.e with GIMP). So why I can't use this option to for the EBSD pictures?
And if I use the option graininput from file, can I consider orientations?

BR
Maike

ralph
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Re: Solidification SLM

Post by ralph » Tue Feb 05, 2019 7:31 pm

There are other types of input for orientations:

a) average grain orientations
a text file with a list of properties per grain, i.e. phase and grain orientation (averaged).
This is recommended because MICRESS will average also local input.

b) local orientations
MICRESS can read local orientations from a VTK file when the dislocation model is applied (type of coupling) and
The dislocation densities and orientations have to be given locally as euler angles or quaternions in VTK format (see an example VTK in the examples, see a driving file part below).
If you give dummy values for the dislocation densities and activate the orientation tabular output from MICRESS to generate the list of properties you need for (a).
Not pretty but might work for you. Maybe the developers will make the input more general in future versions.

A driving file might look like this:

# Orientation
# -----------
# How shall grain orientations be defined?
# Options: angle_2d euler_zxz angle_axis miller_indices quaternion
quaternion
# Which kind of grain orientation input?
# Options: mean
local
#
#
# Grain input
# ===========
# Type of grain positioning?
# Options: deterministic random [deterministic_infile] from_file
from_file
# Filename of initial grain/phase structure [VTK_identifier (default=korn)] ?
ReX_dim02_korn.vtk korn
# Treatment of data?
# (n: none, 1: 1D, x: rotate Clockwise along x-axis, y, z,
# or p: 'phase to grains transformation')
n
# Number of grains at the beginning?
# (Set to less than 1 for the number of grain to be read from the input data,
# with optionally a minimal size, in cells)
-1
# Read grain properties from a file?
# Options: input from_file identical blocks
identical
# Phase number? (integer)
1
# Filename of local dislocation densities [VTK_identifier (default=rhoD)]
ReX_dislo.vtk rhoD
# Filename of local grain orientation
# Options: <file name> <VTK identifier> [orientation type = euler|quater]
ReX_orien.vtk quater

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