Nickel-based superalloy is widely used in aviation,aerospace,shipping and petrochemical industry.The effect of drilling parameters on work hardening and machined surface roughness of nickel-based superalloy FGH97 is summarized according to investigation of its drilling process.Machined surface roughness will increase with the increasing of feed per revolution or drilling speed.With the increase of drilling speed,the hardness of workpiece surface is decreasing.The influence of feed rate on the surface hardness of the workpiece is not significant.With the increase of drilling speed,the depth of workpiece hardening layer becomes smaller and smaller.The wear of the flank can be divided into two stages:uniform wear and rapid failure:when the wear of the flank of the bit is less than VB0.16mm,the wear of the flank is more uniform;when the wear of the flank exceeds VB0.16mm,the flank of drill bit becomes urgent from the outermost edge to the core of drill bit.The wear and tear of the play until the tool fails.
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