期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.08.117
关键词
P91 steel; Tensile; Serrated yielding; Internal friction; Dynamic strain aging; Activation energy
类别
资金
- National Natural Science Foundation of China, PR China [51271001]
- Anhui University of Technology Scientific Research Funds for Young Teachers [2013006]
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 a alpha-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. (C) 2016 Elsevier B.V. All rights reserved.
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