应用电子探针、扫描电子显微镜和能谱仪等观察并分析了新型12％Cr铁素体耐热钢在650℃、120MPa蠕变后的组织和氧化层。结果表明：试验钢蠕变过程经历了3个阶段，在3980h发生断裂；蠕变后，试验钢中的原板条马氏体组织消失，大量的M23C6粒子沿原奥氏体晶界长大并粗化，并在蠕变后期形成了Fe2（W，Mo）金属间化合物；在蠕变过程中试验钢表面形成了三层结构的氧化层，即以铬、锰和硅元素为主靠近基体的内层氧化物，以铁元素为主的中间层氧化物和以铬、锰和硅元素为主的最外层氧化物。
Microstructure and oxide layer of new typed 12wt% Cr ferrite heat resistant steel after creep at 120 MPa, 650℃ was observed and analyzed by using electron probe, scanning electron microscope, and energy dispersion spectrometer. The results show that the creep process of the tested steel had three stages, and fractured at 3 980 h. The original martensitic laths in the tested steel disappeared after creep, while a lot of M23 C6 phases grew and coarsened along the original austenite boundaries and the Fe2 （W, Mo） intermetallic compound was found during the later time of creep. The oxide layer with three-layer structure was obtained on steel surface during creep, the inner layer oxide closing to the substrate was main Cr, Mn and Si elements, the mid-layer oxide was main Fe element and the out layer oxide was main Cr, Mn and Si elements.
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