B0731 Life assessment of hot section gas turbine componets by R. Townsend

By R. Townsend

Those lawsuits of a convention held at Heriot Watt college, Edinburgh, united kingdom conceal the $64000 problems with either aero and business engines. The severe concerns linked to layout, creep and fatigue crack development, coating applied sciences, new fabrics, fix and upkeep of scorching part parts have been coated

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00E-08 10 100 ~K(MParm} Fig. 16 Comparison of the scaled2 Hz and 5 Hz fatiguecrackgrowth baselinedata, to account for dwell during disc spinning programme, with the observed curves for IN718 rim disc at 600oe. Elastic K solution was scaled using elastic/plasticstressratio at notch tip. 7 APPLICATION OF A CRACK GROWTH PREDICTION METHODOLOGY FOR THE OF MODEL DISC PROPAGATION LIVES The predicted 'a' versus N curve for the model disc notch root can be obtained via application of a power law curve fit to the predicted da/ dN versus 11K relationship for the disc test conditions.

In the absence of other information, the sample is selected on the basis of a visual inspection. However, if pyrometer data is available then the hottest blades might be chosen for a conservative assessment. It may be tempting to use the y'-particles in ex-serviceparts as a measure of the remaining life but the validity of such an approach is questionable for the following reasons. 1. (ii) Even very marked degradation of the y' may not lead to a significant reduction in long-term creep properties.

M. McColvin, Technical Report 3296 for COST-SO/II Project UK 6, 1980, Henry Wiggin referred to in Summary of Physical and Mechanical Property Data of Ni-Base Superalloy In-738, COST Report 81-UW-COST-Bl by R Stickler, 1981. 10. V. S. ]. Carr and M. O'Brien, 1995, 'Degradation of MCrAlY Coating and Substrate Superalloy during Long-Term Thermal Exposure', Materials and Manufacturing Processes, 1995, 10, 955-969. 11. S. R. Leverant, 'Influence of Metal Temperature on Base Materials and Coating Degradation of GTD-l11 Bucket', IGTI Gas Turbine Expo, June, Stockholm, Sweden, 1996.

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