Internal friction studies on dynamic strain aging in P91 ferritic steel

详细信息    查看全文

• 作者：Hongwei Zhou^a ; ^b ; Junfei Fang^a ; Yan Chen^a ; Lei Yang^a ; Hui Zhang^a ; Yun Lu^a ; Yizhu He^a ; ^{heyizhu@ahut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：P91 steel ; Tensile ; Serrated yielding ; Internal friction ; Dynamic strain aging ; Activation energy
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：31 October 2016
• 年：2016
• 卷：676
• 期：Complete
• 页码：361-365
• 全文大小：1160 K

文摘

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.