y-y' Lattice misfit and its influence on the microstru-cture of UDIMET 520 during the rejevenation heat treatment : an X-ray diffraction study

Sahu, P and Singh, S R and Mahato, B and Ghosh Chowdhury, S and Ravi Kumar, B and Das, Swapan K and Ghosh, R N (2007) y-y' Lattice misfit and its influence on the microstru-cture of UDIMET 520 during the rejevenation heat treatment : an X-ray diffraction study. Exploratory (OLP). CSIR-NML, Jamshedpur. (Submitted)

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Abstract

The excellent strength of UDIMET 520 is due to the Y' precipitates (L12 structure) embedded in the y (fcc) matrix. These precipitates are generally of spherical shapes with a diameter - 90nm. This increases with service exposure of the material. The high misfit stress due to the difference in the lattice parameters matrix and precipitates along with applied stress is believed to be the decisive factor for the mechanical properties of this alloy, during elevated temperature exposure. At room temperatures, in most Ni-base superalloys, the lattice misfit is small but positive.

Item Type:Project Reports (Exploratory (OLP))
Official URL/DOI:http://eprint.nmlindia.org/6497
Uncontrolled Keywords:UDIMET 520, misfit, Y and y', XRD, microstructure, Rietveld analyst
Divisions:Material Science and Technology
ID Code:6497
Deposited By:Sahu A K
Deposited On:18 Jul 2013 14:52
Last Modified:24 Oct 2013 13:59
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