Stress-assisted and strain-induced martensite morphologies in an Fe--21Ni--0. 6C alloy
Journal Article
·
· Metallography; (United States)
Morphologies resulting from the transformation of austenite to martensite during deformation of an Fe-21Ni-0.6C alloy are described. Samples were deformed either by conventional quasistatic tension loading, by high-strain-rate inertial tension loading, or by flyer-plate, compression shock loading. The various martensites observed are classified either as stress-assisted or strain-induced martensite. The stress-assisted martensite is characteristic of the plate martensite formed by lowering the temperature below the M/sub 8/ of the alloy. The strain-induced martensite, which forms only during plastic deformation, appears as laths or platelets, but with different morphologies in the tension-loaded and shock-loaded samples. In the tension-loaded, deformed samples, the laths are clustered within the deformation bands. In the shock-loaded samples, arrays of relatively thin, long laths, where observed, aligned parallel to the (111)/sub gamma/ twin boundaries of the more homogeneously deformed parent austenite. Where both martensites are present, the strain-induced martensite appears to have formed prior to the stress-assisted martensite. Differences in morphology between the shock-loaded and nonshock-loaded samples are ascribed to differences in the extent of dislocation generation and movement.
- Research Organization:
- Univ. of California, Livermore
- OSTI ID:
- 5006328
- Journal Information:
- Metallography; (United States), Journal Name: Metallography; (United States) Vol. 10; ISSN MEIJA
- Country of Publication:
- United States
- Language:
- English
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