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GB/T 41978-2022Additive manufacturing—Test method for hollow particle ratio of metal powders (English PDF)

增材制造金属粉末空心粉率检测方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 12, 2022

Implementation date

October 12, 2022

Scope

GB/T 41978-2022 is the English-translated version of 增材制造金属粉末空心粉率检测方法.

GB/T 41978-2022 is the Chinese national test method for the hollow particle ratio of metal powders used in additive manufacturing.

It describes the principle, the sample, the test method, the processing of the experimental data and the test report, and defines hollow powder as a particle with closed or semi-closed internal pores, the hollow particle ratio being the number of hollow particles over the total number of particles, expressed as a percentage.

Two routes are given: a microscopy method, in which the powder is mounted, ground and polished and the particle cross-sections counted under an optical microscope or by scanning electron microscope backscattered electron imaging; and an industrial computed tomography method, in which two-dimensional slices are reconstructed in 3D and the particles counted. Issued on 12 October 2022, it has applied since the same date.

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Document preview — GB/T 41978-2022

National Standard of the People's Republic of China

ICS: 25.030; 77.160
Classification: H 71

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Principle
5 Sample
6 Test method
7 Experimental data processing
8 Test report

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.

1 Scope

This document describes the principle, sample, test method, test data processing and test method of metal powder hollow powder rate detection method for additive manufacturing. inspection report.

This document applies to the detection of the hollow powder rate of metal powders for additive manufacturing.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 13298 Metal Microstructure Test Method

GB/T 16594 General Rules for Measurement Methods of Scanning Electron Microscopy of Micron Length

GB/T 29070-2012 General requirements for non-destructive testing industrial computer tomography (CT) testing

GB/T 35351 Additive Manufacturing Terminology

3 Terms and Definitions

GB/T 35351 as well as the following terms and definitions apply to this document.

3.1 Hollow powderholowparticle

Metal powder with closed or semi-closed pores inside.

3.2 Hollow particle ratio

The ratio of the number of hollow powder particles to the total number of powder particles.

Note: The hollow powder rate is expressed as a percentage (%).

4 Principles

4.1 Microscopy

The metal powder is mounted, ground and polished by the metallographic mounting method to obtain the powder metallographic sample, and then the metallographic sample is obtained by using an optical microscope or scanning electron microscope.

Submicroscope-backscattered electron imaging observes the cross-sectional image of powder particles, and counts the total number of powder particles and the number of hollow powder particles in the image After calculation, the hollow powder rate of this batch of powder samples was obtained.

4.2 Industrial computed tomography (CT) method

Using an industrial computer tomography (CT) system, the tomography of the metal powder is performed to obtain a two-dimensional tomographic image of the powder.

3D reconstruction software, reconstruct the three-dimensional image of powder particles, and count the total number of powder particles and hollow powder particles in the two-dimensional or three-dimensional image.

The number of grains was calculated, and the hollow powder rate of the batch of powder samples was calculated.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

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