1.1 本指南说明了试样几何形状和测试方案，可用于评估金属粉末床聚变构建周期的质量，因为它可能受到严重影响激光束粉末床聚变（PBF-LB）制造材料质量的主要系统误差（例如，校准损坏、惰性气体流中断、激光磨损）的影响。 1.2 该方法旨在中断制造过程，如果在每次制造后通过见证试片的通/不通扭矩/扭曲角测量发现材料质量差。 1.3 单位- 以国际单位制表示的数值应视为标准。本指南不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 本指南描述了使用扭矩和扭转角数据作为生产运行的初步验收标准，该生产运行通过定期或连续评估使用先前合格的AM工艺。扭转装置（例如，扭矩扳手、带扭矩读数的仪器车床）用于在竣工状态下破坏构建体积内战略性放置的扭矩样本，以提供构建健康的证据。如果生产运行的一轮测试被确定不符合某些标准（例如:与平均值或其他用户定义的标准有3个标准偏差），则应执行额外的鉴定程序，以确保AM机器或过程健康状况是可接受的。 注1: 将试样定位在相同的构建高度和正在制造的零件或部件的关键位置附近是有利的，以便评估能够代表特定区域。 5.2 本指南并非旨在取代严格的鉴定程序，仅应被视为初步验收标准，以提高AM机器或工艺未受到重大损害的信心。

1.1 This guide illustrates a test specimen geometry and testing protocol that can be used to assess the quality of a metal powder bed fusion build cycle as it could be affected by major system errors (for example, corrupted calibration, disrupted inert gas flow, laser wear) severely affecting the quality of materials fabricated by laser beam powder bed fusion (PBF-LB). 1.2 This method is designed to interrupt the manufacturing process if poor material quality is identified through go/no-go torque/angle of twist measurements of witness coupons after each fabrication. 1.3 Units— The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this guide. 1.4 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. 1.5 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 ====== 5.1 This guide describes the use of torque and angle-of-twist data as a preliminary acceptance criteria for a production run utilizing a previously qualified AM process through periodical or continuous evaluation. A torsion device (for example, torque wrench, instrumented lathe with torque readout) is used to break strategically placed torque specimens within the build volume in the as-built state to provide evidence of build health. If a round of tests from a production run is determined to fall outside of some criteria (for example: 3 standard deviations from the mean or other user defined criteria), additional qualification procedures should be performed to ensure the AM machine or process health are acceptable. Note 1: It is advantageous to locate the specimen at the same build height and near-critical locations of the part or component being fabricated for the evaluation to be representative of the specific region. 5.2 This guide is not intended to replace rigorous qualification procedures and should only be considered as a preliminary acceptance criterion to increase confidence that an AM machine or process has not been significantly compromised.