Analysis of shot-peening and residual stress relaxation in the nickel-based superalloy RR1000

作者：Foss B J^*; Gray S; Hardy M C; Stekovic S; McPhail D S; Shollock B A

来源：Acta Materialia, 2013, 61(7): 2548-2559.

DOI：10.1016/j.actamat.2013.01.031

• Shot-peening
• Dwell-fatigue
• Residual stress
• Recrystallization

This work assesses the residual stress relaxation of the nickel-based alloy RR1000 due to thermal exposure and dwell-fatigue loading. A number of different characterization methods, including X-ray residual stress analysis, electron back-scattered diffraction, microhardness testing and focused ion beam secondary electron imaging, contributed to a detailed study of the shot-peened region. Thermal exposure at 700 degrees C resulted in a large reduction in the residual stresses and work-hardening effects in the alloy, but the subsurface remained in a beneficial compressive state. Oxidizing environments caused recrystallization in the near surface, but did not affect the residual stress-relaxation behaviour. Dwell-fatigue loading caused the residual stresses to return to approximately zero at nearly all depths. This work forms part of an ongoing investigation to determine the effects of shot-peening in this alloy with the motivation to improve the fatigue and oxidation resistance at 700 degrees C.

• 出版日期2013-4