Cluster formation in in-service thermally aged pressurizer welds
Artikel i vetenskaplig tidskrift, 2018

Thermal aging of reactor pressure vessel steel welds at elevated temperatures may affect the ductile-to-brittle transition temperature. In this study, unique weld material from a pressurizer, with a composition similar to that of the reactor pressure vessel, that has been in operation for 28 years at 345 °C is examined. Despite the relatively low temperature, the weld becomes hardened during operation. This is attributed to nanometre sized Cu-rich clusters, mainly located at Mo- and C-enriched dislocation lines and on boundaries. The welds have been characterized using atom probe tomography, and the characteristics of the precipitates/clusters is related to the hardness increase, giving the best agreement for the Russell-Brown model.

RPV steel

Thermal aging

Atom probe tomography

Precipitation

Författare

Kristina Lindgren

Chalmers, Fysik, Materialens mikrostruktur

M. Boasen

Kungliga Tekniska Högskolan (KTH)

Krystyna Marta Stiller

Chalmers, Fysik, Materialens mikrostruktur

P. Efsing

Kungliga Tekniska Högskolan (KTH)

Ringhals AB

Mattias Thuvander

Chalmers, Fysik, Materialens mikrostruktur

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 504 23-28

Ämneskategorier

Keramteknik

Bearbetnings-, yt- och fogningsteknik

Metallurgi och metalliska material

DOI

10.1016/j.jnucmat.2018.03.017