1.1 这些数字参考图像说明了镁合金铸件中可能存在的不连续类型和程度。图示铸件的厚度为 1. / 4. 在里面（6 mm）和 3. / 4. 在里面（19.1毫米）。 1.2 本标准的所有方面均可由认可的工程组织和供应商达成协议，或由认可的工程组织提供具体指导。这些项目应在采购订单或合同中说明。 1.3 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 这些数字参考图像不是为了说明在进行胶片射线照相时在镁合金铸件中发现的不连续的类型和程度。如果对镁合金铸件进行胶片射线照相，请参阅参考射线照片 E155 . 1.5 只有软件和图像的许可副本才能用于生产检查。ASTM/用户许可协议的副本应存档以供审计之用。 注1: 数字参考图像集由14个数字文件、加载所需格式的软件和加载过程中的特定指令组成。这14幅参考图像显示了八个严重程度等级，其中包含一个阶梯楔和两个双线规的图像。 1.6 本标准并非旨在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、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 这些数字参考图像仅供参考，但其设计应确保可根据这些数字参考图像规定验收标准，这些标准可根据特定要求制定。插图是在设计用于形成不连续性的条件下生产的铸件的数字图像。的图像 1. / 4. 在里面（6.4 mm）铸件拟用于以下厚度范围: 1. / 2. 在里面（12.7毫米）。的图像 3. / 4. 在里面（19.1 mm）铸件拟用于厚度超过 1. / 2. 在里面（12.7毫米），小于等于2英寸。（50.8毫米）。 4.2 图像退化- 许多情况会影响数字参考图像的外观和功能。例如，电气干扰、硬件不兼容以及文件或驱动程序损坏可能会影响其外观。ASTM 2002年 位于每个数字参考的右下角的线对仪表可用于通过将使用仪表测量的分辨率与数字参考图像上规定的分辨率进行比较来辅助检测图像劣化。 如果数字参考图像的外观受到不利影响，可能会影响图像的解释和使用，请不要使用数字参考图像。 4.3 认可的工程组织和供应商之间应达成协议，即供应商使用的系统能够检测和分类所需的不连续性。

1.1 These digital reference images illustrate the types and degrees of discontinuities that may be found in magnesium-alloy castings. The castings illustrated are in thicknesses of 1 / 4 in. (6 mm) and 3 / 4 in. (19.1 mm). 1.2 All areas of this standard may be open to agreement between the cognizant engineering organization and the supplier, or specific direction from the cognizant engineering organization. These items should be addressed in the purchase order or the contract. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 These digital reference images are not intended to illustrate the types and degrees of discontinuities found in magnesium-alloy castings when performing film radiography. If performing film radiography of magnesium-alloy castings, refer to Reference Radiographs E155 . 1.5 Only licensed copies of the software and images shall be utilized for production examination. A copy of the ASTM/User license agreement shall be kept on file for audit purposes. Note 1: The set of digital reference images consists of 14 digital files, software to load the desired format and specific instructions on the loading process. The 14 reference images illustrate eight grades of severity and contain an image of a step wedge and two duplex wire gauges. 1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 These digital reference images are intended for reference only, but are so designed that acceptance standards, which may be developed for particular requirements, can be specified in terms of these digital reference images. The illustrations are digital images prepared from castings that were produced under conditions designed to develop the discontinuities. The images of the 1 / 4 in. (6.4 mm) castings are intended to be used in the thickness range up to and including 1 / 2 in. (12.7 mm). The images of the 3 / 4 in. (19.1 mm) castings are intended to be used in the thickness range of over 1 / 2 in. (12.7 mm), up to and including 2 in. (50.8 mm). 4.2 Image Deterioration— Many conditions can affect the appearance and functionality of digital reference images. For example, electrical interference, hardware incompatibilities, and corrupted files or drivers may affect their appearance. The ASTM E2002 line pair gauges located in the lower right hand corner of each digital reference can be used as an aid to detect image deterioration by comparing the measured resolution using the gauges to the resolution stated on the digital reference image. Do not use the digital reference images if their appearance has been adversely affected such that the interpretation and use of the images could be influenced. 4.3 Agreement should be reached between cognizant engineering organization and the supplier that the system used by the supplier is capable of detecting and classifying the required discontinuities.