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The effects of environment and loading waveform on fatigue crack growth in Inconel 718

✍ Scribed by M.R Bache; W.J Evans; M.C Hardy

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
950 KB
Volume
21
Category
Article
ISSN
0142-1123

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✦ Synopsis

The influence of environment and fatigue waveform shape on crack growth behaviour has been evaluated in a workhorse turbine disc material, Inconel 718, at 600Β°C through an experimental programme that investigated crack growth from a notch geometry. Crack growth data are presented for a variety of stress and air pressure conditions, with specific combinations typifying model component test conditions of particular interest. The effect of waveform characteristics covering a range of loading/unloading rates and different dwell periods at peak stress was evaluated. The rates of propagation and the resultant crack profiles were found to be significantly affected by the environmental conditions through control of the dominant fracture mechanisms of transgranular and intergranular cracking. Evidence for environment controlled fatigue crack growth is presented.

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