Carbide Formation and Growth Kinetics Enhanced by Tensile Stress and Elevated Temperature Intergranular Cracking in 2.25Cr-1.5W Heat-Resistant Steels
Abstract
The carbide growth kinetics enhanced in grain interiors is mainly due to the increased diffusivity in the direction normal to the tensile stress. The accelerated kinetics at the grain boundaries normal to the tensile stress is due to the increased grain boundary energy and the widened grain boundary path producing the increased diffusivity in the direction normal to the tensile stress. A strong segregation behavior of impurities to the grain boundary carbide interfaces follows the enhanced grain boundary carbide growth kinetics.
- Publication:
-
Metallurgical and Materials Transactions A
- Pub Date:
- December 2011
- DOI:
- 10.1007/s11661-011-0930-6
- Bibcode:
- 2011MMTA...42.3562H
- Keywords:
-
- Carbide;
- Tensile Stress;
- Postweld Heat Treatment;
- Prior Austenite;
- Intergranular Crack