Machining-induced residual stress on a high strength nickel-base powder superalloy

• Main Author: Li, Wei
• Published: University of Manchester 2008
• Subjects: 620.6
• Online Access: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494660

RR1000 is a new generation nickel base powder superalloy intended for aeroengine disc applications. Great effort has been directed at optimising the machinability of the superalloy. This has included an understanding of the characteristics of the machining-induced residual stresses. This dissertation has investigated the near surface residual stresses induced by face turning the RR1000 superalloy. X-ray diffraction residual stress measurements combined with layer removal have been made in both radial and circumferential directions. Residual stresses at the surface have been measured at various radial locations. Residual stresses in the subsurface have measured as a function of depth. The residual stress depth profiles have shown systematic change with radial locations. Residual stresses tend to have a tensile character at all depths in the hoop direction, but exhibit a significant compressively stressed zone in the radial direction.