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