1.1 本指南: 1.1.1 定义了关键的粉末再利用变量和影响粉末再利用策略的因素。 1.1.2 概述了基于粉末再利用变量和因素选择的粉末再利用策略实施的相关影响。 1.1.3 根据所考虑的材料类型、AM工艺类型和最终用途应用，为AM用户选择粉末再利用变量中的因素提供指导。 1.1.4 就影响粉末性能的关键工艺变量以及减轻其影响的注意事项提供指导。 1.1.5 确定可能受到粉末重复使用影响的关键粉末特性，并为AM用户提供控制措施指导，以确保重复使用粉末的质量。 1.1.6 就实施粉末回收时应考虑的因素提供建议和指导- 使用策略。 1.1.7 提供有关如何设计粉末再利用研究以验证所选再利用变量的信息。 1.1.8 总结取样技术，并就取样技术的选择以及取样技术对粉末再利用策略的适用性向AM用户提供建议。 1.1.9 提供在设计粉末取样研究以验证所选取样技术时需要考虑的因素。 1.2 单位-- 以国际单位制表示的数值应视为标准单位。本标准中不包括其他计量单位。 1.3 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。 1.4 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====== 4.1 本指南的总体目的是支持AM用户为其AM流程和最终用途应用选择最佳再利用策略，并就如何在其组织中实施再利用策略提供指导。 4.2 本指南提出了AM用户可以用来保持粉末质量的可能控制措施，以及在验证所选重复使用策略时需要考虑的因素，包括采样技术指南。 4.3 本指南适用于粉末床熔融工艺中使用的金属粉末。

1.1 This guide: 1.1.1 Defines key powder re-use variables and factors affecting powder re-use strategies. 1.1.2 Outlines implications associated with implementation of powder re-use strategies based on selection of powder re-use variables and factors. 1.1.3 Provides guidance to AM users in selection of factors in powder re-use variables depending on considered material type, AM process type and end-use application. 1.1.4 Provides guidance on key process variables affecting powder properties, and considerations to mitigate their effects. 1.1.5 Identifies key powder properties that may be affected by powder re-use and provides AM users guidance on control measures that can be exploited to ensure quality of re-used powder. 1.1.6 Provides recommendations and guidance on factors to consider when implementing powder re-use strategies. 1.1.7 Provides information on how to design a powder re-use study to validate the selected re-use variables. 1.1.8 Summarizes sampling techniques and provides recommendations to AM users on sampling technique selection, and suitability of sampling techniques for powder re-use strategies. 1.1.9 Provides factors to consider when designing a powder sampling study to validate the selected sampling technique. 1.2 Units— The values stated in SI units are to be regarded as the standard units. No other units of measurement are included in this standard. 1.3 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. 1.4 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 The overall aim of this guide is to support AM users with the selection of the optimum re-use strategy for their AM process and end-use application, and provide guidance on how to implement re-use strategies in their organization. 4.2 This guide suggests possible control measures that AM users can use to maintain powder quality, and factors to consider when validating selected re-use strategies, including guidance on sampling techniques. 4.3 This guide is intended for metal powders used in Powder Bed Fusion processes.