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| Damage of AerMet100 Steel under Alternating Action of SO2 Salt Spray and Impact Load |
| Received:September 26, 2024 Revised:September 29, 2024 |
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| DOI：10.7643/issn.1672-9242.2025.02.001 |
| KeyWord:impact load SO2 salt spray ship surface environment A100 steel Hopkinson pressure bar yield strength ultimate strength |
| Author | Institution |
| XIAO Hanyao |
Qingdao Campus of Naval Aviation University, Shandong Qingdao , China |
| ZHANG Yong |
Qingdao Campus of Naval Aviation University, Shandong Qingdao , China |
| WANG Andong |
Qingdao Campus of Naval Aviation University, Shandong Qingdao , China |
| FAN Weijie |
Qingdao Campus of Naval Aviation University, Shandong Qingdao , China |
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| Abstract: |
| In order to study the service performance of A100 steel in the ship surface environment, the work aims to select the “salt spray-SO2 modified salt spray test method” to simulate the sea surface environment to explore the damage of A100 steel under the alternating action of SO2 salt spray and impact load. A split Hopkinson pressure bar (SHPB) device was used to carry out repeated impact tests on A100 steel specimens corroded for different time, and the stress-strain curves of A100 steel were obtained. The yield strength and ultimate strength of A100 steel under different corrosion degrees were compared, and the changes of micro-morphology were observed by body microscope and scanning electron microscope. The microstructure of A100 steel after alternating corrosion and impact was observed by EBSD, and the change of grain boundary was analyzed. The initial corrosion rate of A100 steel under impact load was slow. After a certain period of corrosion test, the yield strength decreased obviously, and the ultimate strength decreased slightly, in which the yield strength decreased by 390.2 MPa and the ultimate strength decreased by 265.9 MPa, affecting the service life of A100 steel in the equipment. Salt spray-SO2 corrosion test results in a significant decrease in the strength of A100 steel, and corrosion plays a leading role in the effect of grain boundary. Small pits without grain boundaries may lead to discontinuity and local weakening of grain boundaries. Under the repeated impact of high strain rate, the local strengthening of grain boundary region is caused in a certain range, and the corrosion resistance of A100 steel is improved at the initial stage of the test, but with the increase of impact times, the material reaches the plastic deformation limit and the corrosion reaction speed increases again. |
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