NDT assessment of the residual life of fatigue damaged alloy 800HFunded under: JRC-ADVMAT 1C
In order to assess their potential for NDT purposes, the changes in resonance frequency, in specific electric conductivity, in US (Ultra-Sonic) velocity, in US-critical angle and in US-absorption are correlated with the high temperature low-cycle fatigue damage and with the remaining life fraction of Alloy 800H. The fatigue damage is quantified in terms of the initiation and growth of surface microcracks by means of the replica method. The evolving dislocation and phase microstructures are characterised in a semi-quantitative way. Neither the US-velocities nor the US-critical angle are significantly influenced by the fatigue damage. The same holds for the specific electric conductivity. However, both the US-absorption and the resonance frequency show significant changes with increasing life fraction, which may be caused by the evolving dislocation microstructure and by surface cracking, respectively.
Bibliographic Reference: Paper presented: Cost 501 Conference "High Temperature Materials for Power Engineering", Liège (BE), September 24-27, 1990
Availability: Available from (1) as Paper EN 35457 ORA
Record Number: 199011218 / Last updated on: 1994-12-01
Original language: en
Available languages: en