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Studies on Hot Corrosion of the Microstructurally Different Regions of 2.25Cr-1Mo (T22) Boiler Tube Steel Weldment

机译:2.25Cr-1Mo(T22)锅炉钢管焊接组织不同部位热腐蚀的研究

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摘要

This study examines the effect of microstructurally different regions on the hot corrosion of tungsten inert gas weldment in 2.25Cr-lMo (T22) boiler tube steel. Various regions of weldment were oxidized in molten salt Na_2SO_4-60% V_2O_5 environment at 900℃. The base metal was found to oxidize at much higher rates than the weld metal and the heat-affected zone. Oxide scales formed in the three regions were compared by scanning electron microscopy with energy dispersive of X-ray analysis, X-ray diffraction pattern, and electron probe microanalysis. The research investigates the formation of inner scales with free Cr over the HAZ.
机译:本研究探讨了微观结构不同区域对2.25Cr-lMo(T22)锅炉管钢中钨惰性气体保护焊件热腐蚀的影响。在900℃的熔融盐Na_2SO_4-60%V_2O_5环境中,焊件的各个区域均被氧化。发现贱金属的氧化速率比焊接金属和热影响区高得多。通过扫描电子显微镜,X射线分析的能量分散,X射线衍射图和电子探针显微分析,比较了在这三个区域中形成的氧化皮。该研究调查了热影响区上方带有游离铬的内部氧化皮的形成。

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