采用高温XRD技术研究了超级双相不锈钢00Cr25Ni7Mo3.5N表面原位氧化行为。对该钢种在空气条件下进行连续加热，选取一些温度点进行测试，研究了其表面氧化物的生长规律，并分析了第二相的析出行为。结果表明， 600 ℃以下表面组织均为α、γ两相结构。800 ℃时α相开始被氧化成αFe2O3，900 ℃时α相被氧化成αFe2O3和Fe3O4，继续加热至1000 ℃时α相全部氧化消失。即使温度升高到1100 ℃，γ相也没有被氧化。而在空气条件下,不同温度水淬样品内部的室温组织始终保持α、γ两相结构，并且随温度增加，α相比例逐渐增加。此外，加热过程中还发现表面与内部的σ相几乎同步产生和消失。
Insitu surface oxidation of 00Cr25Ni7Mo3.5N supper duplex stainless steel was studied by high temperature XRD. The samples were continually heated in the air and tested at several temperature. The growth of surface oxide was investigated and precipitation of secondphase was investigated. The results showed that the surface layer was only composed of α phase and γ phases below 600 ℃,α was oxidized to αFe2O3 at about 800 ℃, then to αFe2O3+Fe3O4 at about 900 ℃,and disappeared completely up to 1000 ℃. However, γ was not oxidized even at up to 1100 ℃. The microstructure of the samples quenched from various temperatures were of α and γ, and the fraction of α phase was gradually increased with the temperature. In addition, σ phase in surface layer and interior of quenched samples was almost precipitated and dissolved simultaneously during heating.
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