An In-Situ LSCM Study on Bainite Formation in a Fe-0.2C-1.5Mn-2.0Cr Alloy
Abstract
:1. Introduction
2. Experimental Procedure and Microstructure Measurement
3. Results
3.1. Nucleation
- (i)
- nucleation on the grain boundary (●)
- (ii)
- nucleation on the surface of an existing bainite plate (■)
- (iii)
- nucleation occurring inside the austenitic grain (▲).
3.2. Growth
4. Discussion
4.1. Nucleation
4.2. Growth
5. Conclusions
- The rate of nucleation (initiation) of bainitic plates is observed to be rather different in different austenite grains.
- The majority of the bainitic plates nucleate on austenite grain boundaries.
- The observed average nucleation rate for bainitic plates is found to be in qualitative agreement with the classical nucleation theory.
- No special relationship is found between the lengthening rate of bainite plates and their nucleation site.
- The predicted values of the maximum lengthening rate by means of an improved diffusional model considering 400 J mol−1 of growth barrier energy are in agreement with experimentally-measured growth rates of bainite plates at high temperatures.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Steel Composition (mass%) | Austenitizing Temperature | Isothermal Treatment Temperature | ||
---|---|---|---|---|
C | Mn | Cr | ||
0.2 | 1.5 | 2.0 | 1223 K (950 °C) | 723 K (450 °C) |
1233 K (960 °C) | 773 K (500 °C) | |||
1233 K (960 °C) | 823 K (550 °C) | |||
1373 K (1100 °C) | 923 K (650 °C) |
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Sainis, S.; Farahani, H.; Gamsjäger, E.; Van der Zwaag, S. An In-Situ LSCM Study on Bainite Formation in a Fe-0.2C-1.5Mn-2.0Cr Alloy. Metals 2018, 8, 498. https://doi.org/10.3390/met8070498
Sainis S, Farahani H, Gamsjäger E, Van der Zwaag S. An In-Situ LSCM Study on Bainite Formation in a Fe-0.2C-1.5Mn-2.0Cr Alloy. Metals. 2018; 8(7):498. https://doi.org/10.3390/met8070498
Chicago/Turabian StyleSainis, Salil, Hussein Farahani, Ernst Gamsjäger, and Sybrand Van der Zwaag. 2018. "An In-Situ LSCM Study on Bainite Formation in a Fe-0.2C-1.5Mn-2.0Cr Alloy" Metals 8, no. 7: 498. https://doi.org/10.3390/met8070498