|
|
|
| Low Cycle Fatigue Behavior and Cyclic Softening of P92 Ferritic-martensitic Steel |
| Zhen ZHANG1,Zheng-fei HU1,Li-kun FAN2,Bin WANG2 |
1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
2. Shanghai Key Laboratory for Engineering Materials Application Evaluation, Shanghai Research Institute of Materials, Shanghai 200437, China |
|
|
|
|
Abstract The low cycle fatigue (LCF) behavior of P92 martensitic steel was investigated under different controlled strain amplitudes at room and high temperatures (873 K). The cyclic stress responses at all temperatures and strain amplitudes exhibited obviously rapid softening behavior at the early stage of fatigue life, and there was no saturated stage at high temperature. The fracture surfaces of the fatigue samples were observed by scanning electron microscopy (SEM) and optical microscopy. It was shown that crack initiation and propagation occurred transgranularly at both testing temperatures. A typical character was the high density crack branches or secondary cracks along fatigue striations at high temperature, which initiated from the oxidized inclusions and grain boundaries. Further investigation by transmission electron microscopy (TEM) showed that the softening behavior was attributed to the microstructure evolution during fatigue life, such as annihilation of dislocations and migration of martensite laths as well as carbide coarsening, especially for samples tested at high temperature.
|
|
Received: 24 February 2014
Published: 05 June 2015
|
| Fund:Key Project of Shanghai Science and Technology Commission |
|
Corresponding Authors:
Zhang Zhen
E-mail: 012zhangzhen@tongji.edu.cn
|
|
|
|
| [1] |
Xu Yang,,Bo Liao,Fu-ren Xiao,Wei Yan,Yi-yin Shan,Ke Yang. Ripening behavior of M23C6 carbides in P92 steel during aging at 800��C[J]. Chinese Journal of Iron and Steel, 2017, 24(8): 858-864. |
| [2] |
He-yong QIN,Gang CHEN,Qiang ZHU,Chuan-jie WANG,Peng ZHANG. High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy[J]. Chinese Journal of Iron and Steel, 2015, 22(6): 551-556. |
| [3] |
Yan-xin WU,Di TANG,Hai-tao JIANG,Zhen-li MI,Yao XUE,Hai-peng WU. Low Cycle Fatigue Behavior and Deformation Mechanism of TWIP Steel[J]. Chinese Journal of Iron and Steel, 2014, 21(3): 352-358. |
| [4] |
LUO Yun-rong,,HUANG Chong-xiang,TIAN Ren-hui,WANG Qing-yuan. Effects of Strain Rate on Low Cycle Fatigue Behaviors of High-Strength Structural Steel[J]. Chinese Journal of Iron and Steel, 2013, 20(7): 50-56. |
| [5] |
LUO Yun-rong,,HUANG Chong-xiang,GUO Yi,WANG Qing-yuan. Energy-Based Prediction of Low Cycle Fatigue Life of High-Strength Structural Steel[J]. Chinese Journal of Iron and Steel, 2012, 19(10): 47-53. |
| [6] |
SHI Ru-xing,LIU Zheng-dong. Hot Deformation Behavior of P92 Steel Used for Ultra-Super-Critical Power Plants[J]. Chinese Journal of Iron and Steel, 2011, 18(7): 53-58. |
|
|
|
|
2015, Vol. 22 
