Abstract
This research investigated high-temperature corrosion (500 °C) of Cr-Mo steel processed using water jet peening or multifunction cavitation (MFC), and the suitability of such steel for high-temperature boilers and reaction vessels. High-temperature corrosion was induced using an embedment test and a coating test using sulfide-type K2SO4-Na2SO4 powder. To measure the relaxation of the residual stress due to the decrease in work hardening caused by an increase in specimen temperature and the difference in thermal shrinkage between the surface and interior of the specimen, a thermal cycling test was conducted. For the MFC-processed specimen, the oxide film that formed on the surface suppressed mass loss, prevented crack formation, and reduced the compressive residual stress caused by high-temperature corrosion. MFC-processed Cr-Mo steel is thus suitable for a high-temperature corrosion environment.
Highlights
The importance of recycling has increased as waste disposal problems have become more serious.The concept of thermal cycle recycling has attracted attention as it allows the heat generated during incineration treatment to be recovered for power generation.Highly efficient waste power generation is being actively promoted for the effective use of waste energy
It is very important to manufacture materials with such resistance or apply a surface modification that provides it. This present study focuses on water jet peening (WJP) technology, which utilizes cavitation
The results show that multifunction cavitation (MFC) treatment suppresses the high-temperature corrosion (500 ◦ C) of Cr-Mo steel in a sulfide system environment
Summary
The importance of recycling has increased as waste disposal problems have become more serious.The concept of thermal cycle recycling has attracted attention as it allows the heat generated during incineration treatment to be recovered for power generation.Highly efficient waste power generation is being actively promoted for the effective use of waste energy. The importance of recycling has increased as waste disposal problems have become more serious. The concept of thermal cycle recycling has attracted attention as it allows the heat generated during incineration treatment to be recovered for power generation. In the superheater in a high-efficiency waste incineration boiler, molten salt containing chloride and sulfate forms in the ash attaches to the gas side pipe surface due to the high temperature of steam, causing high-temperature corrosion [1]. High-temperature and high-efficiency plants that utilize superheated steam (400 ◦ C) have been constructed. In high-temperature boilers (400 ◦ C or higher), the risk of corrosion damage increases significantly, and materials with high environmental resistance have been investigated. It is very important to manufacture materials with such resistance or apply a surface modification that provides it
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