Abstract
The temper embrittlement tendency of 2.25Cr-1Mo steel after long term service at 427°C was investigated based on charpy impact test. In order to analsyse the effect of hydrogen content on ductile-brittle transition of 2.25Cr-1Mo steel, specimens with temper embrittlement were electrochemically hydrogen charged. The hydrogen content in the specimen was controlled at 2×10-6 and 4×10-6, respectively. Charpy impact test and tensile test were conducted on the specimens with different hydrogen contents. The fracture surface of the specimens was examined. The results indicate that 2.25Cr-1Mo steel after long term service at 427°C has large susceptibility to hydrogen embrittlement, the ductile-brittle transition temperature is increased by the hydrogen charged, and some intergranular fracture is observed on the fracture surface of these speciments. The ductile-brittle transition temperature continues to rise and the percentage of intergranular fracture increases with the increase of hydrogen content. The mechanism of ductile-brittle transition of 2.25Cr-1Mo steel under the interaction of temper embrittlement and hydrogen embrittlement was discussed as well.
| Original language | English |
|---|---|
| Pages (from-to) | 58-62 |
| Number of pages | 5 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 31 |
| Issue number | 10 |
| State | Published - Oct 2010 |
Keywords
- 2.25Cr-1Mo steel
- Additive effect
- Hydrogen embrittlement
- Temper embrittlement
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