1.1这些试验方法涵盖平均粒度的测量，包括比较程序、平面（或Jeffries）程序和截距程序。这些试验方法也可适用于具有类似于对比图中所示金属结构外观的结构的非金属材料。这些试验方法主要适用于单相晶粒结构，但可用于确定多相或多组分试样中特定类型晶粒结构的平均尺寸。 1.2这些试验方法用于确定晶粒面积、直径或截距长度呈单峰分布的试样的平均晶粒尺寸。这些分布近似为对数正态分布。这些测试方法不包括表征这些分布性质的方法。试验方法E1181中描述了具有双重晶粒尺寸分布的试样中的晶粒尺寸表征。试验方法E930中描述了细粒基质中单个极粗晶粒的测量。 1.3这些试验方法仅涉及平面晶粒尺寸的测定，即由剖切面显示的二维晶粒截面的表征。空间晶粒尺寸的测定，即试样体积中三维晶粒尺寸的测量，超出了这些试验方法的范围。 1.4这些试验方法描述了使用标准系列分级图表图像进行比较方法或使用简单模板进行手动计数的技术。 试验方法E1382中描述了使用半自动数字化平板或自动图像分析仪测量晶粒度。 1.5这些试验方法仅涉及推荐的试验方法，其中的任何内容都不应被解释为定义或确立了受试材料的可接受性或适用性极限。 1.6测量值以国际单位制表示，视为标准。列出的等效英寸-磅值在括号中，可能是近似值。 1.7本标准无意解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 These test methods cover the measurement of average grain size and include the comparison procedure, the planimetric (or Jeffries) procedure, and the intercept procedures. These test methods may also be applied to nonmetallic materials with structures having appearances similar to those of the metallic structures shown in the comparison charts. These test methods apply chiefly to single phase grain structures but they can be applied to determine the average size of a particular type of grain structure in a multiphase or multiconstituent specimen. 1.2 These test methods are used to determine the average grain size of specimens with a unimodal distribution of grain areas, diameters, or intercept lengths. These distributions are approximately log normal. These test methods do not cover methods to characterize the nature of these distributions. Characterization of grain size in specimens with duplex grain size distributions is described in Test Methods E1181. Measurement of individual, very coarse grains in a fine grained matrix is described in Test Methods E930. 1.3 These test methods deal only with determination of planar grain size, that is, characterization of the two-dimensional grain sections revealed by the sectioning plane. Determination of spatial grain size, that is, measurement of the size of the three-dimensional grains in the specimen volume, is beyond the scope of these test methods. 1.4 These test methods describe techniques performed manually using either a standard series of graded chart images for the comparison method or simple templates for the manual counting methods. Utilization of semi-automatic digitizing tablets or automatic image analyzers to measure grain size is described in Test Methods E1382. 1.5 These test methods deal only with the recommended test methods and nothing in them should be construed as defining or establishing limits of acceptability or fitness of purpose of the materials tested. 1.6 The measured values are stated in SI units, which are regarded as standard. Equivalent inch-pound values, when listed, are in parentheses and may be approximate. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.