Effect of low-plasticity burnishing on hardness, roughness and residual stresses of nickel alloy samples

The article considers the influence of low-plasticity burnishing parameters (tilt angle, tool pitch) on roughness, hardness and residual stresses in nickel alloy samples. One side of the sample was pre-milled, the other was left original after electrical discharge machining. Low-plasticity burnishing was supposed to be used as a finishing treatment. The results of the study showed that the maximum tool tilt angle for machining complex-profile surfaces is ? 60?. This ensures a roughness of 0.3 ?m; the value of compressive residual stresses in the range of –0.48 ... –0.36 rel. units, which is comparable with the parameters of the surface layer during normal machining (90?). Varying the tool pitch showed that a pitch of 3 mm ensures the lowest roughness, the highest hardness (50 HRC) and high compressive residual stresses. The use of low-plasticity smoothing results in the equalization of residual stress values in 2 directions (along and across the treatment). Roughness is improved by 2 times (up to 0.208 µm) regardless of the type of treated surface.
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