Microstructural evolution and corrosion behaviour of thermally aged dissimilar metal welds of low-alloy steel and nickel-based alloy
| Autor: | Jeonghyeon Lee, Ji Hyun Kim, Seung Chang Yoo, Taeho Kim, Kyoung Joon Choi, Seung-Hyun Kim, Junhyuk Ham |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fusion
Materials science 020209 energy General Chemical Engineering Metallurgy Alloy steel Alloy Dissimilar metal 02 engineering and technology General Chemistry Welding engineering.material 021001 nanoscience & nanotechnology Microstructure law.invention Corrosion Galvanic corrosion law 0202 electrical engineering electronic engineering information engineering engineering General Materials Science 0210 nano-technology |
| Zdroj: | Corrosion Science. 153:138-149 |
| ISSN: | 0010-938X |
| Popis: | The influences of thermal aging on the microstructure, mechanical properties, and corrosion resistance of two different Ni-based weld metal/low-alloy steel dissimilar metal weld fusion boundaries were analysed. Cr23C6 precipitated at the fusion boundary immediately after welding. Additional precipitates were formed in 15 years of thermal aging and coarsened after 30 years of thermal aging. Changing precipitate morphology induced changes in other properties; the highest hardness and corrosion rate were observed at 15 years of thermal aging. The potential difference was bigger in welds with Alloy 152 than those with Alloy 182, yielding higher rates of galvanic corrosion. |
| Databáze: | OpenAIRE |
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