Sahu, Puspendu and Hamada, A S and Ghosh Chowdhury, S and Karjalainen, L P (2007) Structure and microstructure evolution during martensitic transformation in wrought Fe-26Mn-0.14C austenitic steel: an effect of cooling rate. Journal Of Applied Crystallography, 40 (2). pp. 354-361.
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Structure and microstructure evolution under various cooling rates of a wrought austenitic steel, Fe-26Mn-0.14C (composition in mass %), were studied by the Rietveld method of X-ray diffraction pattern fitting, grain boundary characterization by electron back-scattered diffraction (EBSD) and optical microscopy. Cooling rate, density of stacking faults, and austenite grain size and grain boundaries influence the observed gamma(fcc) --> epsilon(hcp) transformation and lead to significant anisotropic X-ray line broadening. Depending on the cooling conditions, the grain boundaries are misoriented at both lower and higher angles. In the epsilon-martensites, the dominant planar fault is twins (similar to 10(-3)). The austenite grains were found to contain low to moderate density of stacking faults (similar to 10(-4)-10(-3)), which act as efficient nucleation sites of the epsilon-martensites. Both X-ray and EBSD analyses estimated negligible twins in the austenite. Approximate average dislocation densities have been estimated and correlated with the grain structure.
|Official URL/DOI:||DOI: 10.1107/S0021889807005882|
|Uncontrolled Keywords:||quantitative phase-analysis; rietveld method; mechanical-properties; temperature; diffraction; refinement; nucleation; bainite; alloys; growth|
|Divisions:||Material Science and Technology|
|Deposited By:||INVALID USER|
|Deposited On:||18 Jul 2011 12:41|
|Last Modified:||13 Oct 2011 13:43|
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