Journal
MATERIALS CHARACTERIZATION
Volume 171, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110771
Keywords
9Cr-1Mo steel; Creep damage; Microstructure evolution; Lamb wave
Categories
Funding
- National Natural Science Foundation of China [61901373, 51371142]
Ask authors/readers for more resources
This study investigated the creep damage of 9Cr-1Mo steel using nonlinear Lamb waves, and found that the measured acoustic nonlinearity parameter is strongly dependent on the creep state. The hierarchical microstructure of 9Cr-1Mo steel evolves during creep. By applying analytical models and kinetics of microstructure evolution, the predominant component of acoustic nonlinearity during the creep process was successfully identified.
Using the nonlinear Lamb wave, this work investigated the damage resulting from microstructure evolution during the creep of 9Cr-1Mo steel at 873 K in detail. At eight creep times, specimens of this steel were firstly prepared by the interrupted test to simulate various creep states, respectively. Then, the measurement of acoustic nonlinearity parameter, and microstructure observation were employed to characterize the resultant damage. The experiment results showed that the measured value of this parameter is strongly dependent upon the creep state. Meanwhile, the hierarchical microstructure of 9Cr-1Mo steel evolves during creep. In order to conduct the quantitative assessment, both the analytical model of acoustic nonlinearity, and the kinetics of microstructure evolution were applied to calculating the acoustic nonlinearity parameter during creep. By comparison of the measured and calculated results, the predominated component of acoustic nonlinearity during the present creep of 9Cr-1Mo steel was clarified successfully by the modeled microstructures. Above all, the present work provided an effective way to monitor and evaluate the creep damage quantitatively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available