GB/T 41337-2022 in English
VALIDAdditive manufacturing nickel-based alloy with powder bed fusion
- Issued on:2022-03-09
- Implemented on:2022-10-01
- File Format:PDF
- Delivery:Via email within 9 business days
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《GB/T 41337-2022粉末床熔融增材制造镍基合金》由TC243（全国有色金属标准化技术委员会）归口，TC243SC4（全国有色金属标准化技术委员会粉末冶金分会）执行，主管部门为中国有色金属工业协会。
Introduction
Analysis of the core content of the standard
GB/T 41337-2022 is my country's first special standard for the manufacture of nickel-based alloys using powder bed fusion technology, which stipulates the technical indicator system for two typical nickel-based alloys, GH3625 and GH4169.
Comparison of key technical indicators
| Performance parameters | GH3625 | GH4169 | Test standards |
|---|---|---|---|
| Tensile strength at room temperature (MPa) | ≥485 | ≥980(X/Y axis) | GB/T 228.1 |
| Specified plastic elongation strength (MPa) | ≥275 | ≥635(X/Y axis) | |
| Elongation after fracture (%) | ≥30 | ≥27(X/Y axis) |
Key points of quality control
Defect control standard
The standard innovatively establishes a defect classification system unique to powder bed fusion:
- Surface defects: Isolated pores with a diameter of ≤0.5mm are allowed, and no more than 4 defects >0.5-1.5mm in a 50mm² area
- Internal defects: X-ray detection allows inclusions with a diameter of ≤0.3mm, and no more than 5 defects >0.3-1.0mm in a 50mm area
Implementation suggestions
- Process verification: A process certification test is required before the new equipment is put into production. It is recommended to use a stepped sample block to verify the parameter stability
- Process monitoring: Establish a molten pool monitoring system to record key parameters such as energy density (80-120J/mm³) and layer thickness (20-60μm) in real time
- Post-processing specifications: Recommended parameters for hot isostatic pressing: 1160℃±10℃/100MPa, insulation for 4 hours
Technology evolution analysis
Compared with ASTM F3055-14a, this standard has achieved breakthroughs in the following aspects:
- For the first time, the mechanical performance indicators in the Z-axis direction are clarified (GH4169 Z-axis tensile strength requirement is ≥920MPa)
- Introduction of HB20160 X-ray detection standard, detection sensitivity increased by 30%
- Establish a surface defect evaluation system unique to powder bed
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