EFFECT OF MICROSTRUCTURE AND ENVIRONMENT ON THE ELEVATED TEMPERATURE CREEP AND LOW CYCLE FATIGUE CRACK GROWTH RATES IN INCONEL 718

Authors
  1. Thamburaj, R.
  2. Koul, A.K.
  3. Wallace, W.
  4. De Malherbe, M.C.
Corporate Authors
Institute for Aerospace Research, Ottawa ONT (CAN);Chief of Research and Development, Ottawa ONT (CAN)
Abstract
A study has been made to investigate the microstructure-environment interactions during elevated temperature (650C) crack growth in Inconel 718, which is used as a turbine disc material for the J85-CAN15 and F-404 engines. Static and cyclic loading conditions (R = 0.05, f = 0.1 Hz) have been studied using a tapered double cantilever beam (constant-K) fracture mechanics speciment. Four microstructures with a wide range of grain sizes, precipitate particle sizes and grain boundary morphologies were studied. It has been attempted to relate observed differences in crack growth behaviour to possible differences in the micromechanisms of deformation and fracture.
Report Number
NAE-LTR-ST-1586 — Laboratory Technical Report
Date of publication
15 May 1986
Number of Pages
155
DSTKIM No
87-01280
CANDIS No
50118
Format(s):
Hardcopy;Originator's fiche received by DSIS

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