| Autor: |
CHANG Zijin, YAN Jialing, QI Yanchang, CUI Bing, CAI Xiaotao |
| Jazyk: |
čínština |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Cailiao gongcheng, Vol 51, Iss 3, Pp 156-165 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1001-4381 |
| DOI: |
10.11868/j.issn.1001-4381.2022.000491 |
| Popis: |
Aiming at the problem that surface cracks occur in the service of 15Cr2Mo1 heat resistant steel welds, NiCrFe alloy which was similar to the usage scenarios of this steel was employed to repair welds with different groove depths simulating crack depths. The feasibility of repair process was verified by the microstructure and performance characterization of the welds. The results show that repair welding at different groove depths is well formed and has no obvious defects, the weld metal is composed of austenitic cell dendrites and second phase precipitates, and there are a small amount of eutectic ferrite near fusion area, however, there is no ferrite in the bright white strip between the type Ⅱ boundary and the melting boundary. The increase of repair welding filler mainly reduces the yield strength of the joint, especially when the groove depth increases from 6.5 mm to 13 mm, the yield strength at room and high temperature is both greatly reduced by about 15%, then the decline trend slows down. With the increase of filler amount, the impact toughness of the fusion line and the 2 mm area outside the fusion line is improved, while the hardness of the whole weld decreases first and then increases with the increase of filler amount, which is related to the restraint of the repairing weld and the increase of precipitates formed by alloy element segregation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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