Effect of mechanical mismatch on fracture mechanical behavior of SA 508 – Alloy 52 narrow gap dissimilar metal weld
| Autor: | Pekka Nevasmaa, Roman Mouginot, Matias Ahonen, Hannu Hänninen, Ulla Ehrnstén, Päivi Karjalainen-Roikonen, Teemu Sarikka |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Cladding (metalworking)
Toughness narrow-gap welding Materials science Alloy Low-alloy steel 02 engineering and technology Welding engineering.material law.invention Strength mismatch 0203 mechanical engineering law alloy 52 General Materials Science Composite material ta216 Reactor pressure vessel Dissimilar metal weld ta214 Filler metal Mechanical Engineering Alloy 52 Narrow-gap welding Metallurgy Fracture mechanics fracture resistance 021001 nanoscience & nanotechnology dissimilar metal weld Pressure vessel 020303 mechanical engineering & transports Mechanics of Materials strength mismatch Fracture resistance engineering 0210 nano-technology low-alloy steel |
| Zdroj: | Sarikka, T, Ahonen, M, Mouginot, R, Nevasmaa, P, Karjalainen-Roikonen, P, Ehrnstén, U & Hänninen, H 2017, ' Effect of mechanical mismatch on fracture mechanical behavior of SA 508-Alloy 52 narrow gap dissimilar metal weld ', International Journal of Pressure Vessels and Piping, vol. 157, pp. 30-42 . https://doi.org/10.1016/j.ijpvp.2017.08.003 |
| ISSN: | 0308-0161 |
| DOI: | 10.1016/j.ijpvp.2017.08.003 |
| Popis: | In modern pressurized water reactor (PWR) designs, dissimilar metal welds (DMW) between the reactor pressure vessel (RPV) nozzles and safe-ends connected to the main coolant pipes are manufactured using a narrow-gap welding (NGW) technique. In addition to the new weld design, the filler metals have been changed from conventional Alloys 82 and 182 to higher Cr containing Alloys 52 and 152 to ensure the structural integrity of the welds during long term operation. The changes in weld design and filler metal have an effect on the mechanical mismatch state of the DMW which has an effect on the fracture behavior of the weld. For the experimental determination of the local strength variations and the fracture mechanical behavior of a modern NG-DMW, a weld mock-up consisting of SA 508 pressure vessel steel with AISI 309L/308L cladding, AISI 304 piping steel, and Alloy 52 weld metal was manufactured. The NG-DMW was characterized in both as-welded and post-weld heat treated (PWHT) conditions. The results showed that the highest strength mismatch existed between the carbon-depleted zone (CDZ) in the SA 508 heat-affected zone (HAZ) and the Alloy 52 weld metal. High fracture toughness values were observed for the different zones of the weld and the crack propagation occurred towards the softer SA 508 HAZ CDZ. |
| Databáze: | OpenAIRE |
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