Mobility for austenite grain growth

ripening phenomena, dislocations, grainboundary topology
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Re: Mobility for austenite grain growth

Post by Raina » Thu Oct 01, 2015 3:02 am


I'm using Micress ran two simulations. One is for ideal isotropic grain growth and another is for ideal grain growth with texture.

For the second simulation, I set initial structure random distributed and the misorientation = 30. For modification for surface energy and mobility, I chose "factor" and both prefactor = 1.0.

Here is part of my input file for second case:
# Phase data
# ==========
# Number of distinct solid phases?
# Data for phase 1:
# -----------------
# Simulation of recrystallisation in phase 1?
# Options: recrystall no_recrystall [verbose|no_verbose]
# Is phase 1 anisotrop?
# Options: isotropic anisotropic faceted antifaceted
# Crystal symmetry of the phase?
# Options: none cubic hexagonal tetragonal orthorhombic
# Should grains of phase 1 be reduced to categories?
# Options: categorize no_categorize


# Shall misorientation be considered?
# Options: misorientation no_misorientation [transition LAB/HAB in degree]
misorientation 30
# Input of the misorientation coefficients:
# Modification of surface energy for low angle boundaries
# Options: factor Read-Shockley
# prefactor of surface energy:
# Modification of the mobility for low angle boundaries
# Options: factor Humphreys [min_reduction + parameters B and N (default: min_red=0. B=5.0 N=4.0)]
# prefactor of the mobility for low angle boundaries

The grain size distribution for first case seems quite well, but later I found that the grain area distribution for the second scenario is not centred at 0, which confuse me a lot. Attached are the grain area distribution for both cases.

Is my code wrong? Or something behind the instructions I've ignored ?


Ideal grain growth with texture
2.jpg (375.25 KiB) Viewed 1867 times
Ideal Grain Growh
1.jpg (395.31 KiB) Viewed 1867 times

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Joined: Mon Jun 23, 2008 9:29 pm

Re: Mobility for austenite grain growth

Post by Bernd » Thu Oct 01, 2015 6:06 pm

Hi Raina,

Why do you compare a radius distribution to an area distribution? Obviously, they cannot be the same.
And why do you expect the area distribution to be centered around 0? How can an area of a grain be negative? Or did you mean "centered around 1"?

What I would expect if you put factors of 1 to the misorientation model is identical results for both cases (if the initial microstructure is otherwise identical) . And I would not be astonished if the curves were really identical if you would plot both for radius or area only...


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