Comparison of pole figure data for dual and TRIP steel

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Comparison of pole figure data for dual and TRIP
steel

• Aditya Aryasomayajula
• PhD student, MSE dept.
• Carnegie Mellon University

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Outline

• Introduction
• Composition and X-Ray data
• Pole figures for dual and TRIP
• Inverse pole figures
• Conclusion

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Introduction-Phase formationsTime-Temperature-Tra
nsformation (TTT) Diagram
Time
3
COMPLEX PHASE
TRIP
DUAL PHASE
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Composition
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X-Ray scan
Dual phase
TRIP phase
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Pole figure data-raw
Dual phase
TRIP phase

• Strong 111 texture observed in both steels due
  to rolling.
• The attainment of superior deep drawability in a
  sheet steel can be linked to the ease of
  nucleation and growth of 111 oriented grains in
  the materials (Mishra and Dirmann, 1982).

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Pole figure data-after defocusing correction
Dual phase
TRIP phase
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Crystal Orientation distribution
Dual phase
TRIP phase

• Maximum texture between 40-50 degrees.
• Texture pattern different for both steels. May be
  due to different phases present in the steel.

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Inverse pole figure
Dual phase
TRIP phase
Inverse pole figures for a typical wire drawn or
rolled sheet. High density at the corners and
medium density at the center.
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Conclusion

• Pole figure data for dual and TRIP phase steel
  were plotted.
• Both phases showed strong texture in 110 and 111
  direction.
• Strong texture in 110 direction may be due to
  rolling of steel and post processing step.

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Thank you. Questions.