Internal friction studies on dynamic strain aging in P91 ferritic steel
The temperature of dynamic strain aging (DSA) regime in P91 steel is between 250 ℃ and 500 ℃.The activation energy (Q) for onset of DSA is 73 kJ/mol, while that for finale of DSA is 202 kJ/mol.There are two main Internal friction(IF) speaks, Shock and SKK with activation energy are 67.9 kJ/mol and 121 kJ/mol respectively, were observed.IFshows 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 the mechanism of DSA which is explained by the diffusion of C atoms and pinning between C and moving dislocation.From these investigation, it could be concluded that DSA in P91 steel are resulted from C atom diffusion and pinning dislocation, instead of Cr or Mo atoms.
P91 steel Tensile serrated yielding Internal friction Dynamic strain aging Activation energy
周宏伟 何宜柱
国内会议
西宁
英文
18-25
2016-07-19（万方平台首次上网日期，不代表论文的发表时间）