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Complementary Use of APFIM and TEM for a Study of Precipitation in a Rapidly Solidified Stainless Steel

Published online by Cambridge University Press:  02 July 2020

T. F. Kelly ,
S. Wisutmethangoon ,
P. P. Camus ,
D. J. Larson  and
M. K. Miller
T. F. Kelly
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI, 53706
S. Wisutmethangoon
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI, 53706
P. P. Camus
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI, 53706
D. J. Larson
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831.
M. K. Miller
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831.
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Stainless steels are important technologically for a wide range of applications. Though they are attractive for their environmental stability, austenitic versions of these steels 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 when elevated concentrations of oxygen and vanadium are present in the metal and we need to know how these elements affect precipitation in the alloy.

The specimen material (FCC 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 hot extrusion followed by precipitation aging as described elsewhere. We observed the structure in TEM and found 20 nm precipitates on dislocations, Fig. 1a. We did not observe smaller precipitates in the grain interiors using diffraction contrast bright field imaging, however, with weak-beam dark field imaging, Moiré fringe contrast is observed throughout the material, Fig. 1b.

Type
Phase Transformations in Metals and Alloys
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. 683 - 684
Copyright
Copyright © Microscopy Society of America 1997

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References

1.Flinn, J. E. and Kelly, T. F., US patent application submitted April 1996.Google Scholar
2.Wisutmethangoon, S., Kelly, T. F., Camus, P. P., Flinn, J. E., Larson, D. J., and Miller, M. K., submitted to 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. Energy and was conducted utilizing the Shared Research Equipment User Program facilities at Oak Ridge National Laboratory.Google Scholar