The wide range of applications within Rolls-Royce engines has led to the policy of developing single crystal alloys with specific targets. This has resulted in a comprehensive family of alloys which meets the requirements of particular engine applications. SRR99 is a high strength alloy to replace DS MM002 in applications where increased creep, tensile and fatigue strength are required. RR2000 ...

since the introduction of engine-driven nickel-titanium (niti) instruments, attempts have been made to minimize or eliminate their inherent defects, increase their surface hardness/flexibility and also improve their resistance to cyclic fatigue and cutting efficiency. the various strategies of enhancing instrument surface include ion implantation, thermal nitridation, cryogenic treatment and el...

A method for deriving apparent activation energies, Eapp, for fatigue crack growth (FCG) is presented. It is shown how these Eapp values can be used to analyse the main underlying mechanism causing the progression of the crack. The Eapp values for fatigue crack growth in air and vacuum, and with and without a dwell are obtained for a range of Ni based superalloys for turbine disc applications. ...