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| Effect of Shot Peening on Corrosion Resistance of Ultra-high Strength Steel |
| Received:November 08, 2019 Revised:November 08, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.02.014 |
| KeyWord:ultra-high strength steel marine environment shot peening corrosion testing corrosion resistance |
| Author | Institution |
| ZHANG Dan-feng |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
| TAN Xiao-ming |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
| QIAN Ang |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
| ZHAN Gui-pan |
Qingdao Branch of Naval Aeronautical University, Qingdao , China |
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| Abstract: |
| The paper aims to improve the corrosion resistance of ultra-high strength steel which is used as the main material for critical fatigue part of shipborne aircraft structure. Based on the measured environmental data, the environmental spectrum of accelerated corrosion test was compiled. The accelerated corrosion test was carried out under laboratory conditions for shot peening and un-peened ultra-high strength steel specimens. The corrosion behavior was characterized from macro/micro morphology, weight loss, corrosion rate and surface roughness. The effect of shot peening on corrosion resistance of ultra-high strength steel was analyzed and discussed. The results showed that the initial corrosion stage of ultra-high strength steel was local pitting corrosion, and then transformed into overall uniform corrosion. Shot peening delayed the transformation of corrosion morphology. The corrosion rate of shot peened test piece was about 75% of that of non-shot peened test piece. When the accelerated corrosion time was equivalently 3 a, the average surface roughness of un-peened specimens and shot peened specimens was 5.67 μm and 4.16 μm respectively, the former was 1.36 times of the latter. Through the comparative analysis of weight loss rate, corrosion rate and surface roughness, it is found that shot peening significantly improves the corrosion resistance of ultra-high strength steel. |
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