GB/T 42787-2023
High Entropy Alloy Powders for Additive Manufacturing (English Version)
- Standard No.
- GB/T 42787-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 42787-2023
- Scope
- This document specifies the grades and classifications, technical requirements, test methods, inspection rules and markings, packaging, transportation, storage, accompanying documents and order forms of high entropy alloy powders for additive manufacturing. This document is applicable to high entropy alloy powders prepared by gas atomization, plasma rotating electrode and other processes for additive manufacturing.
- Introduction
1. Background and significance of standard formulation
With the rapid development of additive manufacturing technology, high entropy alloy powder has become a research hotspot due to its excellent physical properties and broad application prospects. The formulation of this standard aims to standardize the quality requirements of high entropy alloy powder and ensure its reliability in the additive manufacturing process.
2. Technical requirements for high entropy alloy powders
Items Technical indicators Test methods Applicable grades Chemical composition In accordance with the requirements of Table 1 (by mass fraction) GB/T 1480, GB/T 19077 All grades Particle size range Class I: ≤63μm; Class II: 45μm~150μm GB/T 1482 FeCoNiCrMn, etc. Bulk density Class I: ≥3.80g/cm3; Class II: ≥4.00g/cm3 GB/T 1479.1 FeCoNiCrAl, etc. Practical application case analysis
Taking FeCoNiCrMn as an example, it is suitable for the field of laser powder bed melting additive manufacturing. The fluidity requirement of this alloy powder is ≤35.0s/50g, ensuring uniform deposition and excellent forming performance in complex structural parts.
3. Comparative analysis of standard frameworks
Dimensions Domestic standards International standards Difference analysis Chemical composition control Detailed provisions in Table 1 No specific standards found Domestic standards are more concrete Granularity requirements Clear division of Class I and Class II No similar classification found Domestic standards are more detailed 4. Implementation suggestions
Manufacturing enterprises:
- Establish a complete quality control system to ensure that each batch of products meets the standard requirements.
- Strengthen R&D capabilities and develop high entropy alloy powders suitable for different additive manufacturing processes.
Users:
- Clearly define technical indicators and acceptance criteria with suppliers to ensure that material performance meets the expected use.
- Optimize process parameters to give full play to the excellent performance of high entropy alloy powders.
GB/T 42787-2023 Referenced Document
- GB/T 1479.1 Metallic powders—Determination of apparent density—Part 1:Funnal method
- GB/T 1480 Particle size determination by dry sieving of metal powders*， 2025-01-24 Update
- GB/T 1482 Metallic powders—Determination of flow rate—Calibrated funnel methods（Hall flowmeter）
- GB/T 19077 Particle size analysis by laser diffraction*， 2024-10-26 Update
- GB/T 35351 Additive manufacturing—Terminology
- GB/T 5162 Metallic powders—Determination of tap density
- GB/T 5314 Powders for powder metallurgical purposes.Sampling
GB/T 42787-2023 history
- 2023 GB/T 42787-2023 High Entropy Alloy Powders for Additive Manufacturing