Temperature plays a crucial role in hydrogen embrittlement, especially around 200 °C.
At this temperature, hydrogen atoms can move out of materials like iron and certain types of stainless steel.
This helps to reduce internal hydrogen embrittlement.
However, this temperature does not effectively address hydrogen embrittlement caused by surface-absorbed hydrogen.
What is the Effect of Temperature on Hydrogen Embrittlement? (4 Key Insights)
1. Internal Hydrogen Embrittlement at 200 °C
At 200 °C, the thermal energy is enough to let hydrogen atoms move out of the material.
This is important for materials like iron and some stainless steel, where hydrogen can make the material brittle.
The movement of hydrogen out of the material lowers the hydrogen concentration inside, reducing embrittlement.
Studies show that annealing at 200 °C decreases the material's susceptibility to hydrogen embrittlement.
2. Surface-Absorbed Hydrogen at 200 °C
In contrast, 200 °C does not significantly affect hydrogen that is on the surface of the material.
Surface-absorbed hydrogen is less affected by thermal treatments because it is not deeply embedded.
This type of hydrogen embrittlement needs different treatments, like specific surface treatments or coatings.
3. Mechanism and Effects Not Fully Understood
The exact mechanisms and effects of treating hydrogen embrittlement at 200 °C are not fully understood.
It is thought that at this temperature, vacancy elimination in the solid can happen.
Vacancy elimination might improve the material's resistance to deformation and increase its strength.
More research is needed to fully understand these effects.
4. Conclusion
In summary, annealing at 200 °C can effectively reduce internal hydrogen embrittlement by letting hydrogen move out of the material.
However, it is not effective for treating hydrogen embrittlement caused by surface-absorbed hydrogen.
Further research is needed to understand the complex interactions between temperature, hydrogen diffusion, and material properties.
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