Sahu, Puspendu and Hamada, A S and Ghosh, R N and Karjalainen, L P (2007) X-ray Diffraction Study on Cooling-Rate-Induced γfcc→εhcp Martensitic Transformation in Cast-Homogenized Fe-26Mn-0.14C Austenitic Steel. Metallurgical and Materials Transactions A, 38 (9). pp. 1991-2000.
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Abstract
The thermal stability of a cast homogenized austenitic steel with basic composition Fe-26Mn-0.14C has been studied using the Rietveld entire X-ray diffraction (XRD) pattern fitting technique. The decomposition of austenite was observed to be very sensitive to the cooling rate. A very high proportion (49 to 70 pct) of ε-martensites was found in the differently cooled specimens as well in the as-cast specimen. The density of various planar (stacking and twin) faults was also estimated in both ε-martensites and retained austenite. The significant variation in the extent of γ fcc→ε hcp martensitic transformation was interpreted in terms of athermal and isothermal martensites formed during cooling and grain size of austenite. The austenite grains were found to be comprised of a high to moderate density of stacking faults (∼10−3 to 10−2) and negligible twin fault probability (∼10−5). On the other hand, in the ε-martensites, the dominant planar fault was twins (∼10−3). Approximate values of the dislocation density within the retained austenite were also evaluated using the crystallite size and root-mean-square (rms) strain values obtained from the “size-strain-shape” analyses.
Item Type: | Article |
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Official URL/DOI: | http://10.1007/s11661-000-0130-2 |
Uncontrolled Keywords: | ε-martensites; Cast-Homogenized Fe-26Mn-0.14C Austenitic Steel |
Divisions: | Material Science and Technology |
ID Code: | 108 |
Deposited By: | Mr. S N Hembram |
Deposited On: | 08 Oct 2009 14:30 |
Last Modified: | 08 Feb 2012 17:15 |
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