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- Title
Consideration of the growth mode in isochronal austenite-ferrite transformation of ultra-low-carbon Fe–C alloy.
- Authors
Hao Chen; Yongchang Liu; Zesheng Yan; Yanli Li; Lifang Zhang
- Abstract
The three cooling rates of 10, 100, 200 K/min dilatometry experiments are used to investigate the kinetics of the isochronal austenite ( γ) to ferrite ( α) transformation of Fe–0.0036wt.%C alloy. “Normal transformation” and “abnormal transformation” have both been observed for transformations at different cooling rates. In accordance with the thermodynamic characteristics of the γ→ α transformation investigated here and previous kinetic considerations, a JMAK-like approach for the kinetics of isochronal phase transformations was developed that incorporates three overlapping processes: site saturation nucleation, alternate growth modes (from interface-controlled to diffusion-controlled to interface-controlled growth), as well as impingement for random distribution nuclei. The JMAK-like approach has been employed to fit the experimental results, and the fitting results show that for the γ→ α transformation of the Fe–C alloy at all applied cooling rates, the growth mode evolves in the corresponding order: from interface-controlled to diffusion-controlled growth; from interface-controlled to diffusion-controlled to interface-controlled growth; and interface-controlled growth.
- Subjects
AUSTENITE; FERRITES; IRON alloys; PHASE transitions; NUCLEATION
- Publication
Applied Physics A: Materials Science & Processing, 2010, Vol 98, Issue 1, p211
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-009-5375-z