Basic creep models for 25Cr20NiNbN austenitic stainless steels
2013 (English)In: Materials research innovations (Print), ISSN 1432-8917, E-ISSN 1433-075x, Vol. 17, no 5, 355-359 p.Article in journal (Refereed) Published
Basic models for solid solution and precipitation hardening during creep are presented for the austenitic stainless steels 25Cr20NiNbN (TP310HNbN, HR3C, DMV310N). The solid solution hardening is a result of the formation of Cottrell clouds of solutes around the dislocations. In addition to slowing down the creep, the solutes increase the activation energy for creep. The increase in activation energy corresponds to the maximum binding energy between the solutes and the dislocations. The formation of fine niobium nitrides during service enhances the creep strength. It is found that the nitrides have an exponential size distribution. In the modelling the critical event is the time it takes for a dislocation to climb over a particle. The creep models can accurately describe the observed time and temperature dependence of the creep rupture strength.
Place, publisher, year, edition, pages
2013. Vol. 17, no 5, 355-359 p.
Austenitic stainless, Elevated temperature, Precipitation, Solid solution hardening
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-122155DOI: 10.1179/1433075X13Y.0000000120ISI: 000322787400012ScopusID: 2-s2.0-84923125204OAI: oai:DiVA.org:kth-122155DiVA: diva2:621094
QC 201309052013-05-132013-05-132013-09-05Bibliographically approved