Studies on High-Temperature Corrosion resistance of low carbon Steel in Actual boiler environment

[摘要] In coal based power generated plants, hot corrosion and erosion are identified as serious problems, resulting in deterioration of boiler tube. In this present study, the High-Temperature Corrosion behavior of bare SA 210 Gr. A1 steel and Friction stir processed Cr3C2-25(NiCr) inserted Gr. A1 steel samples were compared under cyclic condition of 1500 hours in actual both environments. The kinetics of hot corrosion was measured on the base of weight-change after each cycle. The tool rotation speed for three processed samples were recorded as 1600rpm, 2000rpm, 2400 rpm respectively with transverse speed of 30 mm/min processed by three number of passes. Microstructure evolution of base and FSPed was done by electron back scatter diffraction (EBSD). X-ray diffraction (XRD)and scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS) were performed on the exposed sample to analyze the corrosion products. The base steel sample suffered extreme erosion-corrosion in actual boiler environment, where as processed samples exhibits better hot corrosion resistance (64%, 66%, 73%) respectively. The processed samples also showed 4 fold refined grains, as confirmed by (EBSD).

[发布机构] Department of Automobile Engineering, Chandigarh University, Mohali, Punjab, India^1;Department of Mechanical Engineering, Chandigarh University, Mohali, Punjab, India^2;Department of Mechanical Engineering, Baba Banda Singh Bahadur Engineering College, Fatehgarh Sahib, Punjab, India^3;Department of Mechanical Engineering, Indian Institute of Technology, Ropar, India^4;Department of Metallurgical Engineering and Material Science, IIT Bombay, Powai, Mumbai, India^5

[效力级别] 材料科学

[关键词] Boiler environments;Corrosion products;Cyclic conditions;Electron back scatter diffraction;Energy dispersive spectroscopies (EDS);Erosion;corrosions;Hot corrosion resistance;Micro-structure evolutions