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以3.5Ni低温压力容器钢为研究对象,模拟其加热过程,采用扫描电子显微镜分析了其加热后表面氧化层的显微结构。结果表明:3.5Ni低温压力容器钢的氧化层分为疏松氧化层和致密氧化层,疏松氧化层冷却过程中易鼓起脱落,致密氧化层的外部为一层连续的镍铁金属富集层,将金属氧化物包裹其中,具有一定的强度和韧性,是3.5Ni低温压力容器钢氧化铁皮难以除尽的主要原因。
Taking 3.5Ni cryogenic pressure vessel steel as the research object, the heating process was simulated and the microstructure of the surface oxide layer was analyzed by scanning electron microscopy. The results show that the oxide layer of 3.5Ni cryogenic pressure vessel steel is divided into loose oxide layer and dense oxide layer, the loose oxide layer easily swells off during cooling, and the outer layer of dense oxide layer is a continuous nickel-iron metal enrichment layer. The metal oxide which is wrapped, with a certain degree of strength and toughness, 3.5Ni low temperature pressure vessel steel oxide scale is difficult to divide the main reason.