Generating and Modeling Subsurface Damage in Grinding γ-Ti-48Al

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Abstract
This paper reports on an experimental investigation and modeling results for the grinding-induced subsurface damage in gamma titanium aluminide (γ-TiAl). Grinding was carried out at various depths of cut, wheel and workpiece speeds with a friable diamond grinding wheel. The type/pattern and extent of the subsurface damage was determined by a bonded interface technique using optical microscopy and a surface laser profiler. The results show that the damage beneath the ground surface can be measured from the depth of a rumpled region that is identified with plastic deformation or shear/slip-fault deformation, distortion and microcracks. It was also determined that the depth of grinding-induced subsurface damage in the nearly fully lamellar γ-Ti-48Al microstructure ranges from 150 μm to 400 μm. The severity and depth of the subsurface damage was found to increase with an increase in grinding speed ratio and depth of cut.

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