Constitutive Behaviour of IN738LC Under TMF Cycling With and Without Intermediate Ageing
2007 (English)In: Proceedings of the ASME Turbo Expo [Volume 5: Turbo Expo 2007], New York: ASME , 2007, 131-135 p.Conference paper (Refereed)
Out of Phase Thermo Mechanical Fatigue (OP TMF) 100–950°C tests with 5 min hold time, some including intermediate ageing for 4000h at 950°C after 25 cycles, have been performed on IN738LC at Siemens Industrial Turbomachinery (SIT) AB. In the standard tests, the variation in stress range during the tests was neutral. When tests with intermediate ageing were added to the analysis, the combination of test data strongly suggest that the neutral response above was because of a fairly even competition between softening due to degradation (particle coarsening etc.) and work hardening. We have concluded that the work hardening occuring for a lab hold time of 5 min. will be insignificant under more realistic, i.e. component-near, hold times. Based on this, we have devised a method for reduction of lab TMF test results, with their too short hold times, to handle actual, i.e. significantly longer, component hold times.
Place, publisher, year, edition, pages
New York: ASME , 2007. 131-135 p.
, Proceedings of the ASME Turbo Expo, ISSN ISBN: 079184790X; 978-079184790-9
TMF, Thermomechanical fatigue
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:liu:diva-71037DOI: doi:10.1115/GT2007-27853ISBN: 0-7918-4794-2OAI: oai:DiVA.org:liu-71037DiVA: diva2:444193
ASME Turbo Expo 2007: Power for Land, Sea, and Air (GT2007)