Change search
ReferencesLink to record
Permanent link

Direct link
Evaluation of phase relations in weld overlays of 316, 309MoL and SKWAM
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

AREVA NP Uddcomb AB wants to replace the material used for a specific valve seat used in boiling water reactors, BWR. Their solution is a weld overlay of different stainless steels composed of two buffer layers of the steel 309 MoL followed by two layers of the filler material SKWAM welded on type 316 stainless steel or carbon steel. The report focuses on the long term structural effects in the weld overlay due to the operating temperature in BWRs, in this case 270 °C. To investigate the thermodynamic stability in the weld overlay the computer software Thermo-Calc was used and a metallographic examination was carried out. The results from these procedures were compared and possible long term effects were discussed. Most likely spinodal decomposition is the most severe structural change that may appear in the material. At equilibrium conditions at the operating temperature ferrite is decomposed into Fe-rich and Cr-rich ferrite but since the kinetics is not included in the calculations it is not possible to determine the rate of decomposition.

Place, publisher, year, edition, pages
2013. , 23 p.
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-123402OAI: diva2:626412
Educational program
Master of Science in Engineering - Materials Design and Engineering
Available from: 2013-06-14 Created: 2013-06-08 Last updated: 2013-06-24Bibliographically approved

Open Access in DiVA

fulltext(2278 kB)819 downloads
File information
File name FULLTEXT01.pdfFile size 2278 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Materials Science and Engineering
Manufacturing, Surface and Joining TechnologyMetallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 819 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 202 hits
ReferencesLink to record
Permanent link

Direct link