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Sandia Fracture Challenge Microstructure Characterization

Sandia Fracture Challenge Microstructure Characterization. Yuxiong Mao, PhD Mark Horstemeyer, CAVS Chair Professor Center for Advanced Vehicular Systems Mississippi State University. 15-5PH Stainless Steel Plate.

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Sandia Fracture Challenge Microstructure Characterization

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  1. Sandia Fracture ChallengeMicrostructure Characterization Yuxiong Mao, PhD Mark Horstemeyer, CAVS Chair Professor Center for Advanced Vehicular Systems Mississippi State University

  2. 15-5PH Stainless Steel Plate • Six samples were made from the received specimen to observe the Longitudinal-Transverse (LT1&LT2), Longitudinal-Thickness (LS1&LS2), Transverse-Thickness (TS1&TS2) sections. • Samples were mounted and polished. Then etched with Vilella'sreagent for 90 seconds.

  3. LT1 & LT2 Before Etch LT sections are homogeneous. Very few inclusions can be found in these sections. Note the lines here are polish scratches. Inclusions LT1 Overview LT2 Overview

  4. LT1 Before Etch High Resolution View

  5. LS1 Before Etch Near Surface Banding and inclusions can be observed in LS sections. The inclusions are aligned along the longitudinal direction. The bands run through the entire sample and are clustered in the center region. Inclusions Center Overview High Resolution View

  6. LS2 Before Etch Near Surface Center Overview High Resolution View

  7. TS1 Before Etch Near Surface Banding and inclusions can also be observed in TS sections. The bands are shorter compared to those in LS sections. Center Overview High Resolution View

  8. TS2 Before Etch Near Surface Center Overview High Resolution View

  9. Quantitative Analyses of the inclusions observed in LS and TS un-etched sections

  10. LT1 After Etch: Martensite Dominated Homogenous Martensitic matrix covers the entire LT sections. Martensitic matrix Overview High Resolution View

  11. LT2 After Etch Overview High Resolution View

  12. LS1 After Etch: Ferrite Banding is an Issue Banding/segregations can be observed in LS sections. The bands run through the entire sample and are clustered in the center region. The bands are aligned along the longitudinal direction. These segregations may have detrimental effects on the mechanical properties(a). Near Surface Ferrite Stringer Center Banding Overview (a) B. Potter, “NDT of Precipitation Hardened Steels Using Fluorescent Magnetic Particle Testing,” NDT Solution, December 2003 High Resolution View

  13. LS2 After Etch Near Surface Center Overview High Resolution View

  14. TS1 After Etch Near Surface Banding/segregations can also be observed in TS sections. The bands are aligned along the transverse direction and are shorter than those in LT sections. Center Banding Overview High Resolution View

  15. TS2 After Etch Near Surface Center Overview High Resolution View

  16. Grain Boundary Segmentation

  17. Grain Size Distributions: Change Hardening Behavior Locally

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