Study on machining performance in grinding of Ni-base single crystal superalloy DD5

The Ni-base single crystal superalloy DD5 is commonly employed in critical parts of turbine blades and disks aeronautical engines. To improve the surface machining quality, single-factor experiments were carried out to investigate changes grinding force, morphology, chip morphology under different conditions (dry, conventional flood, minimum quantity lubrication). showed that flood lubrication (MQL) could enormously reduce roughness, work-hardened layer thickness DD5. At depth 5 ~ 15 μm, subsurface microhardness decreased sharply with increase depth, was order dry grinding, MQL. However, at 20 150 tended equilibrate fluctuate around 540 HV. In addition, compared degree serration obvious or MQL environment, its formation frequency fluctuated less stable. Within experimental parameters, method obtained lowest roughness highest quality associated cost, which ideal cooling for superalloy.