同样采用ISO/ASTM 52904:2019，该标准描述了金属粉末床熔合（PBF）机器和工艺的操作和生产控制，以满足商业航空航天组件和医疗植入物等关键应用。本文包含的要求适用于使用激光束和电子束的粉末床聚变（PBF）的生产部件和机械试样。

Identically adopts ISO/ASTM 52904:2019, which describes the operation and production control of metal powder bed fusion (PBF) machines and processes to meet critical applications such as commercial aerospace components and medical implants. The requirements contained herein are applicable for production components and mechanical test specimens using powder bed fusion (PBF) with both laser and electron beams.