Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 30-42 |
| Number of pages | 13 |
| Journal | International Journal of Pressure Vessels and Piping |
| Volume | 157 |
| DOIs | |
| Publication status | Published - 1 Nov 2017 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- alloy 52
- dissimilar metal weld
- fracture resistance
- low-alloy steel
- narrow-gap welding
- strength mismatch
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Effect of mechanical mismatch on fracture mechanical behavior of SA 508 - Alloy 52 narrow gap dissimilar metal weld. / Sarikka, Teemu; Ahonen, Matias; Mouginot, Roman; Nevasmaa, Pekka; Karjalainen-Roikonen, Päivi; Ehrnstén, Ulla; Hänninen, Hannu.
In: International Journal of Pressure Vessels and Piping, Vol. 157, 01.11.2017, p. 30-42.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Effect of mechanical mismatch on fracture mechanical behavior of SA 508 - Alloy 52 narrow gap dissimilar metal weld
AU - Sarikka, Teemu
AU - Ahonen, Matias
AU - Mouginot, Roman
AU - Nevasmaa, Pekka
AU - Karjalainen-Roikonen, Päivi
AU - Ehrnstén, Ulla
AU - Hänninen, Hannu
N1 - CA2: BA2506 CA2: BA2405 CA2: BA2505 CA2: BA2506 AU2: Ahonen, Matias AU2: Nevasmaa, Pekka AU2: Karjalainen-Roikonen, Päivi AU2: Ehrnstén, Ulla
PY - 2017/11/1
Y1 - 2017/11/1
N2 - 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.
AB - 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.
KW - alloy 52
KW - dissimilar metal weld
KW - fracture resistance
KW - low-alloy steel
KW - narrow-gap welding
KW - strength mismatch
UR - http://www.scopus.com/inward/record.url?scp=85029507571&partnerID=8YFLogxK
U2 - 10.1016/j.ijpvp.2017.08.003
DO - 10.1016/j.ijpvp.2017.08.003
M3 - Article
VL - 157
SP - 30
EP - 42
JO - International Journal of Pressure Vessels and Piping
JF - International Journal of Pressure Vessels and Piping
SN - 0308-0161
ER -