An experimental study on cavitation erosion-corrosion performance of ANSI 1020 and ANSI 4135 steel

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• 作者：Leqin Wang ; Ning Qiu ; Dieter-Heinz Hellmann…
• 关键词：Cavitation erosion ; Micro structure ; Oxidation ; Pitting tests ; Ultrasonic cavitation
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：30
• 期：2
• 页码：533-539
• 全文大小：5,296 KB
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• 作者单位：Leqin Wang (1)
  Ning Qiu (1)
  Dieter-Heinz Hellmann (2)
  Xiaowen Zhu (3)
  
  1. Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China
  2. KSB Aktiengesellschaft, Frankenthal, 67225, Germany
  3. Zhejiang Keer Pump Stock Co., Ltd, Whenzhou, 325200, China
  
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering
  Structural Mechanics
  Control Engineering
  Industrial and Production Engineering
  
• 出版者：The Korean Society of Mechanical Engineers
• ISSN：1976-3824

文摘

Cavitation erosion is quite complex, containing corrosion-erosion interaction effect. High temperature oxidization may be aroused after bubble collapse, accompanied by hot gas contacting with the pump component surface. The analysis of the erosion pits can be an effective way to know the mechanism of cavitation erosion. In present paper, the cavitation erosion resistance of carbon steel (ANSI 1020) and alloy steel (ANSI 4135) were tested in an ultrasonic vibration apparatus. By using energy dispersive X-ray spectroscope and three dimensional laser microscope, the chemical composition around erosion pits and the oxidation film structure were analyzed. By using metallographic microscope and scanning electronic microscope, the metallographic structure of specimens (e.g., carbon steel and alloy steel), the nano structured iron oxide and corresponding influence on specimen’s anti-erosion performance were discussed. Based on the comparison between the different tests performed in distilled water and tap water respectively, results can be obtained that erosion rate of carbon steel and alloy steel varies with the component of water which had close correlation to the oxidation effect. Erosion rate of alloy steel 4135 was much lower in distilled water compared to tap water while the difference of carbon steel 1020 was not that large. The remarkable different responses of these two materials had close relationship with oxidation effect. The oxidation effect transferred the original structure of alloy steel surface which had high anti-erosion capability, into newly generated iron oxide structure, which was preferentially to be attacked. The pumping of slightly corrosive fluids frequently leads to erosion-corrosion damage on impellers, and corrosion can further amplify the erosion process. Keywords Cavitation erosion Micro structure Oxidation Pitting tests Ultrasonic cavitation