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Correlative microscopy for quantification of prior austenite grain size in AF9628 steel

机译：AF9628钢中预奥氏体晶粒尺寸的相关显微镜检查

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摘要

The characterization of prior austenite grain size is important for an understanding of the microstructure property relationships in steels. In this study, the prior austenite grain boundaries (PAGBs) were delineated in a low alloy high performance steel, AF9628, with two different methods: (i) conventional approach via etching, followed by optical or scanning electron microscopy, and (ii) analysis of electron backscattered diffraction (EBSD) data. Correlative microscopy was employed to obtain images of the same region of the specimens with the two independent methods. The threshold method of delineating PAGBs in EBSD orientation maps revealed a large fraction of the PAGBs that were delineated by the conventional approach. However, many PAGBs were not delineated in the EBSD maps. On the other hand, the twin boundaries within the prior austenite grains were not delineated by the conventional approach and many of these boundaries were delineated in the EBSD maps. The net result was that the measurements on EBSD orientation maps resulted in an overestimation of the prior austenite lineal intercept grain size by approximately 21% and an underestimation of the surface area of PAGB per unit volume of material (S-v) by approximately 17%. The errors in the measurements on the EBSD orientation maps were discussed in the context of the probability density function for misorientation angles in cubic metals (i.e., Mackenzie plot), which suggests that the overestimation in the prior austenite grain size measurement would be expected to be even higher (specifically 47%) for the general case of random texture of prior austenite grains with no twins. In view of the results of this study, it is suggested that the use of threshold method for delineating PAGBs and determining prior austenite grain size or S-v may be sufficient for examining relative trends, for example, as a result of heat treatments. However, the conventional methods to delineate the PAGBs may be required when quantitative values of microstructural parameters are of interest.
机译：先前奥氏体晶粒尺寸的表征对于了解钢中的微观结构性质关系是重要的。在该研究中，以低合金高性能钢，AF9628描绘了先前的奥氏体晶界（PAGB），具有两种不同的方法：（i）通过蚀刻的常规方法，然后是光学或扫描电子显微镜，以及（ii）分析电子背散射衍射（EBSD）数据。采用相关显微镜检查，以通过两种独立方法获得标本的相同区域的图像。描绘EBSD定向图中的晶片的阈值方法显示出通过传统方法描绘的大部分封端。然而，许多PAGBS在EBSD地图中没有划定。另一方面，通过常规方法在EBSD地图中描绘了先前奥氏体晶粒内的双界限并在EBSD地图中描绘了许多这些边界。净结果是EBSD取向图的测量结果导致先前奥氏体线性截取粒度的高估约为21％，并且每单位体积的材料（S-V）的PAGB的表面积低约17％。在立方金属（即，Mackenzie Plot）中的概率密度函数的上下文中讨论了EBSD定向图的测量中的误差，这表明预期先前奥氏体晶粒尺寸测量的高度估计甚至更高（特别是47％），用于预奥氏体颗粒的随机质地，没有双胞胎。鉴于本研究的结果，建议使用用于描绘盲肠的阈值方法和确定先前奥氏体晶粒尺寸或S-V可以足以检查相对趋势，例如由于热处理。然而，当微观结构参数的定量值感兴趣时，可能需要划叠PAGB的常规方法。

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