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Analysis of Nanometer-Scale Precipitation in a Rapidly Solidified Stainless Steel

Published online by Cambridge University Press:  02 July 2020

S. Wisutmethangoon ,
T.F. Kelly ,
P.P. Camus ,
J.E. Flinn ,
D.J. Larson  and
M.K. Miller
S. Wisutmethangoon
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI53706
T.F. Kelly
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI53706
P.P. Camus
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI53706
J.E. Flinn
Affiliation:
formerly of Idaho National Engineering Laboratory, Idaho Falls, ID, 83415
D.J. Larson
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN37831
M.K. Miller
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN37831
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Though stainless steels are important technologically for a wide range of applications, they are not generally known for their very high strength. We have rapid-solidification-processed many stainless steels by gas atomization and achieved strength improvements of over 50% relative to conventionally-processed stainless steels with concomitant improvement in corrosion and oxidation behavior. These strength improvements are most pronounced after aging treatments when elevated concentrations of oxygen and vanadium are present in the stainless steel. An austenitic (FCC) stainless steel (Fe-16%Ni-9%Cr-0.5%Mn-0.2%V-0.0137%N-0.008%O by weight) was prepared by gas atomization and consolidated by hot extrusion at 900°C. These specimens were heat treated for 1 hour at 1000°C and aged at 600°C for 500 hours.

The microstructure of each alloy composition was observed in TEM with bright field imaging. After aging, most alloys showed the same precipitate morphology as before aging. An obvious change, however, was found only in the alloy with highest oxygen content.

Type
Analytical Electron Microscopy
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 981 - 982
Copyright
Copyright © Microscopy Society of America 1997

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References

1Flinn, J. E. and Kelly, T. F., US patent application submitted April 1996.Google Scholar
2Kelly, T. F., Wisutmethangoon, S., Larson, D. J., and Miller, M. K., these proceedings.Google Scholar
3 This research was sponsored by the Division of Materials Sciences, U. S. Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp., by the U. S. Department of Energy and was conducted utilizing the Shared Research Equipment User Program facilities at Oak Ridge National Laboratory.Google Scholar