This is a poster for MGI workshop In GT

1. HIGH THROUGHPUT
MICROSTRUCTURE-MECHANICAL
PRAOli KhPosEravRaniT, JoYrdaDn WAeaTveAr, SaCikiOranmLaLyeEe SCamTudIraOla,N Surya R. Kalidindi
Georgia Institute
of Technology
EBSD scan of 1,824,372 data points with 4 μm spatial resolution---- 12 hours
1 mm
Time and Cost in Microstructure Characterization , such as EBSD scan
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
Nanoindentation Arm
1
2
1 2
Distance from the Boundary (μm)
The George W. Woodruff School of mechanical Engineering, Georgia Institute of Technology, Atlanta GA
How many samples are required and how many tests have to be performed to
get true measurements of mechanical properties for a given microstructure?
Connection of the mechanical
response of a large sample with
the microstructure of a small area
Thermo-Mechanical Gradient Processes
50 μm
MULTISCALE MECHANICAL TEST METHOD
100μm
10μm
1μm
1000+μm
Nanoindentation Micro Macro
SEM pole piece
EBSD detector
Sample
Indenter tip
Step 6 Step 5 Step 4 Step 3 Step 2 Step 1
Kernel average misorientation (KAM)
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
Furnace Constant
RT
A set of thermocouples
Double Cone
Compression
Sample
Total Strain Gradient from DIC
Distance
Temperature
A set of thermocouples
Distance
Cooling rate
Aging Temperature Gradient
Martensite Laths Ferrite Grains
INTEGRATED NANOINDENTATION WITH SMART EBSD IN-SITU NANOINDENTATION TEST