GB/T 39254-2020 in English
VALIDAdditive manufacturing—Evaluation guideline for mechanical properties of metal parts
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
《GB/T 39254-2020增材制造 金属制件机械性能评价通则》由TC562（全国增材制造标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Analysis of the core content of the standard
| Evaluation dimensions | Traditional manufacturing | Additive manufacturing | Key points of difference |
|---|---|---|---|
| Sample preparation | Single direction sampling | Three-way orthogonal sampling | Forming anisotropy needs to be considered |
| Hardness test | Mainly surface testing | Core/surface comparison | Prioritize the Vickers hardness method |
| Data validity | Batch sampling | Furnace samples + body samples | Dual verification mechanism |
Key technical requirements
1. Sample preparation specifications
The standard requires that furnace samples must meet the three same principles: same material batch, same process parameters, and same post-processing process. For body sampling, the machining allowance must be guaranteed to be ≥3mm to avoid interference from the heat-affected zone.
2. Special test requirements
- Fatigue test: The axial strain control method preferably uses φ6mm cylindrical specimens
- Fracture toughness: The notch orientation of the compact tensile specimen must be consistent with the direction of maximum stress
- Creep test: It is required to record the secondary creep rate of 0.0001%/h
Implementation suggestions
Application case of aircraft engine blades
A certain type of titanium alloy blade adopts the laser powder bed fusion process. According to this standard:
- Three groups of Z-axis tensile specimens were prepared in the furnace, and the test σb≥1100MPa
- Body sampling for high temperature endurance test (650℃/620MPa)
- Surface hardness gradient test HV0.2 fluctuation ≤5%
Standard evolution analysis
Compared with ASTM F3122-14, this standard innovatively proposes:
- Introduction of three-way orthogonal sampling system
- Clarification of the data correlation requirements for furnace samples and body samples
- Added a new dynamic test method for elastic modulus
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