GB/T 38913-2020 in English
VALIDTest methods for hydride orientation fraction of nuclear grade zirconium and zirconium alloy tubes
- Issued on:2020-06-02
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 38913-2020核级锆及锆合金管材氢化物取向因子检测方法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC3（全国有色金属标准化技术委员会稀有金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Technical Background of the Standard
This standard aims at the hydrogen embrittlement problem of zirconium alloy tubes used for nuclear reactor fuel cladding during service, and establishes a quantitative detection method for the hydride orientation factor. Hydride orientation is a key indicator for evaluating the material's resistance to hydrogen-induced cracking, and directly affects the safety of nuclear facility operation.
Core Detection Methods
| Technical Parameters | Autoclave Hydrogenation Method | Gas Hydrogenation Method |
|---|---|---|
| Temperature Control | 360±6℃ | 399±14℃ |
| Pressure Conditions | 18.6±1.4MPa | Atmospheric Pressure |
| Hydrogenation Medium | 1mol/L LiOH Solution | 1.8-2.2%O₂/Ar Mixed Gas |
Key Operation Points
Sample Preparation Specifications
1. Dimension Control: The length of the autoclave hydrogen permeation sample is 30±3mm, and the length of the gas hydrogen permeation sample is 13±3mm
2. Surface Treatment: Adopt a step-by-step pickling process (HF:HNO₃:H₂O=1:4.5:4.5)
3. Taboo: It is forbidden to use heating/pressurization to prepare metallographic samples
Metallographic Analysis Technology
• Etchant Selection: Lactic acid: nitric acid: hydrofluoric acid (45:45:8) composite etchant is recommended
• Region Division: Divide the tube wall into three equal inspection areas: outer layer/middle layer/inner layer
• Counting rules: Only hydrides with a length of ≥15μm are counted, and crossed hydrides need to be divided and counted
Standard implementation suggestions
1. Laboratory configuration: It needs to be equipped with an automatic metallographic analysis system to ensure that the angle measurement accuracy is ≤1°
2. Quality control: Regularly verify the etching effect with standard samples (see Appendix B morphology diagram)
3. Safety protection: Hydrofluoric acid operation requires emergency treatment materials such as calcium gluconate gel
Technology evolution analysis
Compared with traditional qualitative evaluation methods, the innovations of this standard are:
• Establish a clear definition of radial hydrides (angle θ≤standard value)
• Introduce a three-layer regional analysis method to eliminate detection bias
• A minimum statistical quantity (≥100 hydrides) is specified to ensure data representativeness
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