intellectual merits
Post on 19-Jan-2016
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Intellectual Merits MET DMR-0348818, Seetharaman, Carnegie Mellon University
Motivation: The structure and properties of steel parts for various applications, depend on the rates of and manner in which a number processes occur at high temperatures, such as flow of molten steel, reactions between molten steel and its container, slag, and atmosphere, solidification and solid state phase transformations. Since all these kinetic processes occur at high temperatures, they are somewhat difficult to study through classical metallographic tools such as optical or electron microscopy.
Goals: This program aims to utilize and enhance current capabilities to quantify high temperature metallurgical phenomena through direct observations. A high temperature confocal scanning laser microscope and x-ray fluoroscopy
Initial structure: Electron microscopy
Observation of structural changes during thermal treatment: High
temperature confocal microscopy
Final structure: Optical microscopy
508ºC
949ºC
50 μm
551ºC
250ºC
Example: increasing the understanding of thermal processing by following the evolution of microstructure through the use of multiple microscopy techniques
Broader Impacts
Outreach: A materials science module was developed and used for a two day SWE activity for female middle and high school students. The middle-school activities included: (i) casting miniature metal statues and characterizing cast structures, (ii) investigating temperature sensitive mechanical properties of polymers and (iii) introducing the phenomenon of superconductivity. The high school activities involved developing materials for a “rocket to be launched to space”. Approximately 50 students participated in each of the two age groups.
Education: A web based module is being developed that shows CSLM movies of solidification and phase transformation phenomena for Fe-based alloys. The module will have the appearance shown below to the left. CSLM movies have been develop for a Fe-C alloys and examples are shown, in the figures to the right. The images show -ferrite platelet precipitation from a -matrix upon cooling.
MET DMR-0348818, Seetharaman, Carnegie Mellon University
Cooling
Composition:
File Tools
Conditions:
Window
wt%Fe:Time: 1:15:06 Temp: 1528 C
66.8um
Time: 1:15:06 Temp: 1528 C
66.8um66.8um
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Phases:-ferrite, liquid
Solidification Module Fe-C
wt%C:
Heatingx
99.94 0.06
Tstart [oC]:
Cooling rate [oC/sec]:
1540
3
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