Relaxation phenomena in nitrogen austenite steels

Journal Article · Mon Dec 15 04:00:00 EST 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00372-2· OSTI ID:586034

Gavriljuk, V G; Bugaychuk, S N; Sozinov, A L ^[1]; Foct, J ^[2]

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1. Inst. for Metal Physics, Kiev (Ukraine)
2. Univ. de Lille I (France). Lab. de Metallurgie Physique

In 1953 Finkelstein and Rozin published an article about a relaxation peak of internal friction (IF) in carbon containing CrNi 25 20 austenitic steel at 300 C at a frequency of {approximately} 1 Hz. They attributed damping to migration of carbon atoms in FCC lattice but did not specify if any possible mechanism of relaxation would be involved. Later on Ke and Tsien observed this peak in manganese and chromium-nickel-manganese austenitic steels. The mechanism suggested included the reorientation, under external stress, of atomic pairs formed by carbon atoms with substitutional atoms or vacancies, which created tetragonal distortions in FCC and lattice and, thus, caused a Snoek-like mechanism of relaxation. A number of versions of noncubic defects in fcc lattice responsible for Snoek-like relaxation were discussed. The aim of this study is to identify the possible relaxation mechanism taking place in the nitrogen austenite in connection with the nature of impurity atoms.

• OSTI ID: 586034
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 12 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITIC STEELS
CRYSTAL DEFECTS
CRYSTAL LATTICES
NITROGEN ADDITIONS
RELAXATION