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利用扫描电子显微镜、电子探针、X射线衍射和透射电镜研究了新型奥氏体耐热钢Super304H在高温时效条件下析出相的变化。结果表明,Super304H钢经700~1250℃时效后,组织中出现4种析出相:Nb(C,N)、富Cu相、M23C6和NbCrN。随时效温度的不同,析出相发生析出或溶解的变化,同时它们的形态、分布和数量随温度变化呈现出不同的变化规律,其中M23C6在700~900℃主要沿晶界析出,这将会降低钢的高温蠕变强度及抗晶间腐蚀性能。
The changes of precipitated phases of the new austenitic heat-resistant steel Super304H under high temperature aging were studied by scanning electron microscopy, electron probe, X-ray diffraction and transmission electron microscopy. The results show that there are four kinds of precipitated phases in the microstructure of the Super304H steel after 700 ~ 1250 ℃ aging: Nb (C, N), Cu - rich phase, M23C6 and NbCrN. With the different aging temperature, precipitation or dissolution of the precipitated phase changes, while their morphology, distribution and quantity show different changes with temperature, of which M23C6 mainly precipitates along the grain boundaries at 700-900 ℃, which will decrease High temperature creep strength and intergranular corrosion resistance of steel.