Director for Sales & Business Development Europe & Asia, Curtis-Wright Surface Technologies
AbstractThis study investigated thermal and mechanical relaxation of residual stresses and fatigue strength following hot-corrosion of single-crystal CMSX-4 laser peened (LP) and a cyclic LP plus annealing (LP+TME) processes. Stress measurements showed LP plastic penetration exceeded shot peening depth by a factor of 25. Specimens were exposed to sulphate corrosives at 700°C for 300 hours and then fatigue tested. Five non-LP specimens failed in low cycle whereas three LP samples achieved multi-million-cycle runout, indicating consistent large benefit by laser peening. Fatigue strength tests achieved improvement of 2:1. Post-fatigue RS measurement showed 5 mm depth eigenstress remaining in an LP specimen.
|Room 9||Thursday 30th November||14:00-14:30||Lloyd Hackel|
S10-2 Fatigue under severe environmental conditions
38 - Effects of high energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness and fatigue life and strength of single crystal nickel CMSX-4® superalloy