Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7974761 | Materials Science and Engineering: A | 2016 | 15 Pages |
Abstract
The temperature of dynamic strain aging (DSA) regime in P91 steel is between 523 K and 773 K. The activation energy (Q) for onset of DSA is 73 kJ/mol, while that for finale of DSA is 202 kJ/mol. Two main Internal friction (IF) speaks were observed, Snoek and SKK with the activation energy of 67.9 kJ/mol and 121 kJ/mol, respectively. IF shows that activation energy of 73 kJ/mol is equal to that of C atom body diffusion in α-Fe, and 202 kJ/mol is equal to binding energy between C atoms and moving dislocations. These results confirm that the mechanism of DSA can be explained by the diffusion of C atoms and pinning between C and moving dislocation. These investigations indicate that DSA in P91 steel is resulted from C atom diffusion, instead of Cr or Mo atoms.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Hongwei Zhou, Junfei Fang, Yan Chen, Lei Yang, Hui Zhang, Yun Lu, Yizhu He,