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.
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ASME Turbo Expo 2007: Power for Land, Sea, and Air
May 14–17, 2007
Montreal, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4794-2
PROCEEDINGS PAPER
Constitutive Behaviour of IN738LC Under TMF Cycling With and Without Intermediate Ageing Available to Purchase
Magnus Hasselqvist,
Magnus Hasselqvist
Siemens Industrial Turbomachinery AB, Finspong, Sweden
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Johan Moverare
Johan Moverare
Siemens Industrial Turbomachinery AB, Finspong, Sweden
Search for other works by this author on:
Magnus Hasselqvist
Siemens Industrial Turbomachinery AB, Finspong, Sweden
Johan Moverare
Siemens Industrial Turbomachinery AB, Finspong, Sweden
Paper No:
GT2007-27853, pp. 131-135; 5 pages
Published Online:
March 10, 2009
Citation
Hasselqvist, M, & Moverare, J. "Constitutive Behaviour of IN738LC Under TMF Cycling With and Without Intermediate Ageing." Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air. Volume 5: Turbo Expo 2007. Montreal, Canada. May 14–17, 2007. pp. 131-135. ASME. https://doi.org/10.1115/GT2007-27853
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