HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION

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1. HIGH THROUGHPUTMICROSTRUCTURE-MECHANICALPRAOli KhPosEravRaniT, JoYrdaDn WAeaTveAr, SaCikiOranmLaLyeEe SCamTudIraOla,N Surya R. KalidindiGeorgia Instituteof TechnologyEBSD scan of 1,824,372 data points with 4 m spatial resolution---- 12 hours1 mmTime and Cost in Microstructure Characterization , such as EBSD scanHigh resolution data collection at Grain Boundary regionsLow resolution scan pattern400 scan pointsScan time (90 fps) : 4.5 secHigh resolution adaptivescan pattern2,600 scan pointsScan time (90 fps) : 29 secHigh resolution scan pattern102,400 scan pointsScan time (90 fps) : 19 minNanoindentation Arm121 2Distance from the Boundary (m)The George W. Woodruff School of mechanical Engineering, Georgia Institute of Technology, Atlanta GAHow many samples are required and how many tests have to be performed toget true measurements of mechanical properties for a given microstructure?Connection of the mechanicalresponse of a large sample withthe microstructure of a small areaThermo-Mechanical Gradient Processes50 mMULTISCALE MECHANICAL TEST METHOD100m10m1m1000+mNanoindentation Micro MacroSEM pole pieceEBSD detectorSampleIndenter tipStep 6 Step 5 Step 4 Step 3 Step 2 Step 1Kernel average misorientation (KAM)124356Does 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 datacollection BSE image can be used to locate the coordinatesof interesting object such as grain boundariesQuench Rate GradientFurnace ConstantRTA set of thermocouplesDouble ConeCompressionSampleTotal Strain Gradient from DICDistanceTemperatureA set of thermocouplesDistanceCooling rateAging Temperature GradientMartensite Laths Ferrite GrainsINTEGRATED NANOINDENTATION WITH SMART EBSD IN-SITU NANOINDENTATION TEST