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ORTools_example05.m
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ORTools_example05.m
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% *********************************************************************
% ORTools - Example 5
% *********************************************************************
% Using the OR peak fitter to deconvolute multiple ORs in a TRIP-TWIP (TRWIP) alloy
% https://www.youtube.com/watch?v=Hj5kVscjljU&t=323s
% *********************************************************************
% Dr. Azdiar Gazder, 2020, azdiaratuowdotedudotau
% Dr. Frank Niessen, 2020, contactatfniessendotcom
% (Remove "dot" and "at" to make this email address valid)
% *********************************************************************
% Example 5 may return an error with MTEX 5.7.0, but will work without error
% with MTEX. 5.6.x and ORTools v.1.0 or with MTEX v5.7.1 onwards.
home; close all; clear variables;
currentFolder;
set(0,'DefaultFigureWindowStyle','normal');
screenPrint('StartUp','ORTools - Example 5');
%% Initialize MTEX
% startup and set some settings
startup_mtex;
setMTEXpref('xAxisDirection','east');
setMTEXpref('zAxisDirection','outOfPlane');
setMTEXpref('FontSize',14);
setInterp2Tex;
% Default directories - Do not modify
Ini.dataPath = [strrep(pwd,'\','/'),'/data/'];
Ini.cifPath = [Ini.dataPath,'input/cif/'];
Ini.ebsdPath = [Ini.dataPath,'input/ebsd/'];
Ini.texturePath = [Ini.dataPath,'output/texture/'];
Ini.imagePath = [Ini.dataPath,'output/images/'];
Ini.phaseNames = {'Gamma','AlphaP','Epsilon'};
%% Import EBSD data and save current file name
ebsd = loadEBSD_ctf([Ini.ebsdPath,'TRWIPsteel.ctf'],'convertSpatial2EulerReferenceFrame');
ebsd = ebsd('indexed');
%% Compute, filter and smooth grains
screenPrint('SegmentStart','Computing, filtering and smoothing grains');
% Grains are calculated with a 3° threshold
[grains,ebsd.grainId] = calcGrains(ebsd('indexed'),'threshold',3*degree,...
'removeQuadruplePoints');
%% Rename and recolor phases
screenPrint('SegmentStart','Renaming and recoloring phases');
%Rename "Iron fcc" to "Gamma", "Iron bcc (old)" to "AlphaP" and
%"Epsilon_Martensite" to "Epsilon"
ebsd = renamePhases(ebsd,Ini.phaseNames);
%Choose your favourite colors
ebsd = recolorPhases(ebsd);
%% Define the transformation system
screenPrint('SegmentStart','Finding the orientation relationship(s)');
% Choose "Gamma" as a parent and "AlphaP" as a child phase
job = setParentGrainReconstructor(ebsd,grains,Ini.cifPath);
%% Plot initial maps
% Plotting the phase map
plotMap_phases(job,'linewidth',2);
% - Epsilon has formed from Gamma and AlphaP from Epsilon
% Parent and child IPF maps
plotMap_IPF_p2c(job,vector3d.Z,'linewidth',2);
% - Multiple gamma grains are covered
% Parent-child grain boundary misorientation map
plotMap_gB_p2c(job,'linewidth',1.5);
% - Misorientation mainly around ~45°
% Child-child grain boundary misorientation map
plotMap_gB_c2c(job,'linewidth',1.5);
% - Different misorientation angles are visible
%% Fit multiple ORs
% We can fit the OR from gamma-alpha boundary misorientations
%
% Use the peak fitter in the pop-up menu
% - We see that there are two misorientation peaks
% - Set the threshold to include them both in the fitting
% - Choose to export "All ORs" - defineOR returns a cell array job{:}
job = defineORs(job);
% The command window shows us that two ORs are at work:
% - The first OR is showing no misorientation, or cube-on-cube OR
% Let us check the disorientation of alphaP child-child boundaries and
% compare OR 1 with K-S and N-W
plotHist_OR_misfit(job{1},...
[orientation.KurdjumovSachs(job{1}.csParent,job{1}.csChild), ...
orientation.NishiyamaWassermann(job{1}.csParent,job{1}.csChild)],...
'legend',{'K-S','N-W'});
% compare OR 2 with K-S and N-W
plotHist_OR_misfit(job{2},...
[orientation.KurdjumovSachs(job{2}.csParent,job{2}.csChild), ...
orientation.NishiyamaWassermann(job{2}.csParent,job{2}.csChild)],...
'legend',{'K-S','N-W'});
%% Plot the inverse pole figure
% Plot inverse pole figures for parent-child and child-child boundary
% disorientations
% We color the boundaries up to 5° disorientation to emphasize the effects
plotIPDF_gB_misfit(job{1},'maxColor',5);
% - The misorientation axis is scattered because of the 0° angle
% - The disorientation is quite high
plotIPDF_gB_misfit(job{2},'maxColor',5);
% - OR 2 is the governing OR with a good match for the misorientation
% axis and the disorientation angle
%% Analyze the microstructure by plotting maps
% Plot parent-child and child-child OR boundary disorientation map
% We color the boundaries up to 5° disorientation to emphasize the effects
plotMap_gB_misfit(job{1},'linewidth',1.5,'maxColor',5);
% - Only few small grains of Alpha with no connection to Epsilon
% match
plotMap_gB_misfit(job{2},'linewidth',1.5,'maxColor',5);
% - Most grains apart from the small grains of OR 1 match
% Seeing that the OR 1 describes a cube-on-cube misorientation of small
% alphaP grains in gamma, these are identified as misindexed points, i.e.
% points belonging to gamma but misindexed as alphaP.
% We should revert these misindexed grains.
%% Merging misindexed alphaP with gamma
screenPrint('SegmentStart','Merging misindexed alphaP with gamma');
% % Check details on OR1
ORinfo(job{1}.p2c);
% % Select OR1 and refine it based on the fit with boundary misorientations
job{1}.calcParent2Child;
% % OR1 has only 1 variant, calcGBVotes finds the fit of that theoretical
% % variant with the parent-child boundary misorientations
job{1}.calcGBVotes('p2c','numFit',1); % was 'noC2C' in MTex v5.6.0
% % We transform all alpha grains that have a fit of <=3° to gamma
job{1}.calcParentFromVote('minFit',3*degree);
% We can see that the small grains are transformed
figure;
plot(job{1}.parentGrains,job{1}.parentGrains.meanOrientation);
% We can merge them into the surrounding grains and check the result
job{1}.mergeSimilar('threshold',5*degree);
figure;
plot(job{1}.parentGrains,job{1}.parentGrains.meanOrientation);
% Finally, we make a new ebsd map, with the misindexed alpha grains of OR1
% being transformed to gamma grains
ebsdCleaned = job{1}.calcParentEBSD;
%% Recomputing the grains from the new EBSD dataset
screenPrint('SegmentStart','Recomputing, filtering and smoothing grains');
[grains,ebsd.grainId] = calcGrains(ebsdCleaned,'threshold',3*degree,...
'removeQuadruplePoints');
%% Making a "new" job containing the new EBSD data and grains
screenPrint('SegmentStart','Finding the orientation relationship(s)');
% Choose "Gamma" as a parent and "Epsilon" as a child phase
job = setParentGrainReconstructor(ebsdCleaned,grains,Ini.cifPath);
%% Use the OR peak fitter again to check the histogram
job = defineORs(job);
% We can now see that the peak at 0° has disappeared.
% From here we can continue working with the second OR or explore the other
% smaller peaks to plot maps or reconstruct the parent microstructure
%% Save images
saveImage(Ini.imagePath);
%% Summary
% This example has shown how to identify different ORs and revert them
% individually. In the present case, we found an OR corresponding to a
% cube-on-cube orientation relationship, which was caused by misindexing
% gamma as alpha. We reverted these grains to gamma in order to clean the
% map.