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本文采用先进的扫描透射电子显微镜方法,研究含Cr为9%的硼合金化钢在热处理过程和蠕变测试过程中的微观组织的演变规律,并对于硼元素的作用进行了重点探讨。通过扫描透射电子显微镜获得的电子能量损失谱图像能提供具有高的空间和能量分辩率的碳、氮、铁、铬、钒的组成定量图(单位为atoms/nm3),这些图包含了丰富的元素信息。对包含在M23(C,B)6颗粒中的MX析出相进行了鉴定,并分析了其中的硼含量。为了识别氮化钒颗粒向复杂的氮化物(改性Z相)的早期转变过程,通过应用二元直方图分析对能量过滤透射电子显微镜(TEM)的元素图谱进行处理。另外,该研究绘制了蠕变检测样品的原奥氏体晶界图,并通过能量过滤透射电子显微镜,电子能量损失和X射线光谱图对析出相进行了鉴别。
In this paper, advanced scanning transmission electron microscopy was used to study the microstructure evolution of boron alloyed steels containing 9% Cr during the heat treatment and creep tests. The effects of boron on the boron elements were also discussed. The electron energy loss spectral images obtained by scanning transmission electron microscopy can provide a quantitative compositional diagram (in atoms / nm3) of carbon, nitrogen, iron, chromium and vanadium with high spatial and energy resolution, which contains rich Element information The MX precipitates contained in M23 (C, B) 6 particles were identified and the boron content was analyzed. In order to identify the early transition of vanadium nitride particles to complex nitrides (modified Z-phase), elemental spectra of energy-dispersive transmission electron microscopy (TEM) were processed by applying binary histogram analysis. In addition, the study mapped the original austenite grain boundaries of creep test samples and identified the precipitates by energy-dispersive transmission electron microscopy, electron energy loss and X-ray spectroscopy.