Effect of thermal aging on microstructure and hardness of industrial heats of Alloy 690

Caitlin Huotilainen*, Ulla Ehrnstén, Matias Ahonen, Hannu Hänninen

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

Abstrakti

Alloy 690 is a high-chromium nickel-base alloy used in various primary coolant system components and for steam generator tubes in many nuclear power plants. A thermal treatment is typically applied for Alloy 690 components, giving the material a better resistance to stress corrosion cracking, compared to mill-annealed condition, due to fine grain boundary carbides of type M23C6. The effect of thermal aging at 400 C was investigated in four different heats of Alloy 690. After 5000 h and 10 000 h of aging, one of the materials showed a significant increase in hardness, whereas the three other heats did not show a measurable effect of aging. Microstructural and hardness characterizations were performed, on both initial and aged material, by applying optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, microhardness and nanoindentation measurements, in order to study the microstructural features causing the observed increase in hardness.

AlkuperäiskieliEnglanti
Otsikko19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
KustantajaAMERICAN NUCLEAR SOCIETY
Sivut156-164
Sivumäärä9
ISBN (elektroninen)978-0-89448-765-1
TilaJulkaistu - 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors - Boston, Yhdysvallat
Kesto: 18 elokuuta 201922 elokuuta 2019
Konferenssinumero: 19

Conference

ConferenceInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors
LyhennettäEnvDeg
MaaYhdysvallat
KaupunkiBoston
Ajanjakso18/08/201922/08/2019

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