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- Title
Internal Friction of Austenitic Fe-Mn-C-Al Alloys.
- Authors
Lee, Young-Kook; Jeong, Sohee; Kang, Jee-Hyun; Lee, Sang-Min
- Abstract
The internal friction (IF) spectra of Fe-Mn-C-Al alloys with a face-centered-cubic (fcc) austenitic phase were measured at a wide range of temperature and frequency ( f) to understand the mechanisms of anelastic relaxations occurring particularly in Fe-Mn-C twinning-induced plasticity steels. Four IF peaks were observed at ~346 K (73 °C) (P), 389 K (116 °C) (P), 511 K (238 °C) (P), and 634 K (361 °C) (P) when f was 0.1 Hz. However, when f increased to 100 Hz, whereas P, P, and P disappeared, only P remained without the change in peak height, but with the increased peak temperature. P matches well with the IF peak of Fe-high Mn-C alloys reported in the literature. The effects of chemical composition and vacancy (v) on the four IF peaks were also investigated using various alloys with different concentrations of C, Mn, Al, and vacancy. As a result, the defect pair responsible for each IF peak was found as follows: a v-v pair for P, a C-v pair for P, a C-C pair for P, and a C-C-v complex (major effect) + a Mn-C pair (minor effect) for P. These results showed that the IF peaks of Fe-Mn-C-Al alloys reported previously were caused by the reorientation of C in C-C pairs, not by the reorientation of C in Mn-C pairs.
- Subjects
INTERNAL friction; DAMPING (Mechanics); ALLOYS; METALLIC composites; AUSTENITIC stainless steel; AUSTENITIC steel; STAINLESS steel
- Publication
Metallurgical & Materials Transactions. Part A, 2017, Vol 48, Issue 12, p6102
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-017-4335-z