HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION
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HIGH THROUGHPUT MICROSTRUCTURE- MECHANICAL PROPERTY DATA COLLECTION Ali Khosravani, Jordan Weaver, Saikiranmayee Samudrala, Surya R. Kalidindi EBSD scan of 1,824,372 data points with 4 μm spatial resolution---- 12 hours Time and Cost in Microstructure Characterization , such as EBSD scan 1 mm High resolution data collection at Grain Boundary regions Low resolution scan pattern 400 scan points Scan time (90 fps) : 4.5 sec High resolution adaptive scan pattern 2,600 scan points Scan time (90 fps) : 29 sec High resolution scan pattern 102,400 scan points Scan time (90 fps) : 19 min Georgia Institute of Tech nology Nanoindentation Arm 1 2 Distance from the Boundary (µm) 2 1 The George W. Woodruff School of mechanical Engineering, Georgia Institute of Technology, Atlanta GA 1µm 10µm 100µ m 1000+µm Nanoindentati on Micro Macro MULTISCALE MECHANICAL TEST METHOD EBSD detector Sample Indenter tip SEM pole piece Kernel average misorientation (KAM) Step 6 Step 1 Step 2 Step 3 Step 4 Step 5 1 2 4 3 5 6 Does the microstructure of the selected sample represent the microstructure of entire part? Higher resolution & smaller area vs. Lower resolution & larger area • BSE image collection is faster than EBSD data collection • BSE image can be used to locate the coordinates of interesting object such as grain boundaries Quench Rate Gradient Furnac e Constant RT A set of thermocouples Thermo-Mechanical Gradient Processes Double Cone Compression Sample Total Strain Gradient from DIC Distance Temperatu re A set of thermocouples Distance Cooling rate Aging Temperature Gradient Martensite Laths Ferrite Grains IN-SITU NANOINDENTATION TEST INTEGRATED NANOINDENTATION WITH SMART EBSD How many samples are required and how many tests have to be performed to get true measurements of mechanical properties for a given microstructure? 50 μm Connection of the mechanical response of a large sample with the microstructure of a small area
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Transcript of HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION
HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTIONAli Khosravani, Jordan Weaver, Saikiranmayee Samudrala, Surya R. Kalidindi
EBSD scan of 1,824,372 data points with 4 μm spatial resolution---- 12 hours
Time and Cost in Microstructure Characterization , such as EBSD scan
1 mm
High resolution data collection at Grain Boundary regionsLow resolution scan pattern400 scan pointsScan time (90 fps) : 4.5 sec
High resolution adaptive scan pattern2,600 scan pointsScan time (90 fps) : 29 sec
High resolution scan pattern102,400 scan pointsScan time (90 fps) : 19 min
Georgia Instituteof Technology
Nanoindentation Arm
1
2
Distance from the Boundary (µm)
21
The George W. Woodruff School of mechanical Engineering, Georgia Institute of Technology, Atlanta GA
1µm
10µm
100µm
1000+µm
Nanoindentation Micro Macro
MULTISCALE MECHANICAL TEST METHOD
EBSD detector
Sample
Indenter tip
SEM pole piece
Kernel average misorientation (KAM)
Step 6 Step 1Step 2Step 3Step 4Step 5
1
2
4
3
5
6
Does the microstructure of the selected sample represent the microstructure of entire part?
Higher resolution & smaller area vs. Lower resolution & larger area
• BSE image collection is faster than EBSD data collection
• BSE image can be used to locate the coordinates of interesting object such as grain boundaries
Quench Rate Gradient
FurnaceConstant RT
A set of thermocouples
Thermo-Mechanical Gradient Processes
Double Cone Compression
Sample
Total Strain Gradient from DICDistance
Tem
pera
ture
A set of thermocouples
Distance
Cool
ing
rate
Aging Temperature Gradient
Martensite Laths Ferrite Grains
IN-SITU NANOINDENTATION TEST INTEGRATED NANOINDENTATION WITH SMART EBSD
How many samples are required and how many tests have to be performed to get true measurements of mechanical properties for a given microstructure?
50 μm
Connection of the mechanical response of a large sample with the microstructure of a small area
