Abstract
Low-alloy steels are based on carbon steel in combination with several percent or less (in many cases 1%) alloying elements, and offer improved resistance to corrosion at a slightly higher cost than carbon steel. However, these materials do not exhibit the same corrosion resistance as stainless steel. The authors have previously developed the novel multifunction cavitation (MFC) technique, which combines ultrasonic cavitation with water jet cavitation. It has been reported that MFC-processed Cr-Mo steel (JIS-SCM435) has improved corrosion resistance in rust, and voids and cracks are not formed to any significant extent in the specimen interior. In this study, the authors investigated the cause of improvement of corrosion resistance of rust in MFC processed Cr-Mo steel (JIS-SCM435) by surface potential measurement and dissolved oxygen measurement.
Highlights
Low-alloy steels with improved corrosion resistance can be obtained by alloying carbon steel with various elements at concentrations of several mass% or less
At present, the improvements in the fatigue characteristics and corrosion resistance of metals resulting from conventional surface modification techniques are not always satisfactory, because the operating environments of such materials typically become increasingly harsh over time
These samples were stored in ambient air for two months after processing
Summary
Low-alloy steels with improved corrosion resistance can be obtained by alloying carbon steel with various elements at concentrations of several mass% or less (or even less than 1 mass% when combinations of elements are employed). At present, the improvements in the fatigue characteristics and corrosion resistance of metals resulting from conventional surface modification techniques are not always satisfactory, because the operating environments of such materials typically become increasingly harsh over time. Surface modification technologies such as water jet cavitation (WJC) have been applied to improve the stress corrosion cracking and fatigue strength of alloy steels [1]. The authors have previously developed a novel technique combining ultrasonic cavitation (UC) and WJC, referred to as multifunction cavitation (MFC) [5] This method has the advantage of utilizing the same high temperature, high pressure microjet typically employed in both WJC and UC. The authors investigated the cause of improvement of corrosion resistance of rust in MFC processed Cr-Mo steel (JISSCM435) by surface potential measurement and dissolved oxygen measurement
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