Effect of Thermal Aging on the Transformation Temperatures and Specific Heat Characteristics of 9Cr-1Mo Ferritic Steel |
| Journal |
Defect and Diffusion Forum (Volume 279) |
| Volume |
Phase Transformation and Diffusion |
| Edited by |
G. B. Kale, M. Sundararaman, G. K. Dey and G. P. Tiwari |
| Pages |
85-90 |
| DOI |
10.4028/www.scientific.net/DDF.279.85 |
| Online since |
August, 2008 |
| Authors |
B. Jeya Ganesh,
S. Raju,
E. Mohandas,
M. Vijayalakshmi
|
| Keywords |
Calorimetry, Ferritic Steel, Phase Transformation, Specific Heat |
| Abstract |
The effect of thermal ageing on the heat capacity and transformation behaviour of
behaviour of 9Cr-1Mo-0.1C (wt.%) ferritic / martensitic steel has been studied using differential
scanning calorimetry (DSC) in the temperature range 473 to 1273 K. It is found that a-ferrite +
carbide ® g-austenite phase transformation temperature is only mildly sensitive to microstructural
details; but the enthalpy change associated with this phase transformation and especially, the change
in specific heat around the transformation regime are found to be dependent on the starting
microstructure generated by thermal ageing treatment. Prolonged ageing for about 500 to 5000
hours in the temperature range 823 to 923 K contributed to a decrease in heat capacity, as compared
to the normalised and tempered sample. The martensite microstructure is found to possess the
lowest room temperature CP among different microstructures. |
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