Abstract
The goal of this contribution was to describe parameters of surface integrity of two machined materials; austenite and duplex stainless steel. Residual stresses and presence of straininduced martensite were studied as a function of the side rake angle. Residual stresses of surface and sub-surface layers were determined using X-ray diffraction techniques and hole-drilling method. By using X-ray diffraction, it is possible to determine residual stresses in each phase separately, in comparison with hole-drilling method. The presence of strain-induced martensite was investigated using Barkhausen noise and optical microscope.
Highlights
Actual state of technology of sewage disposal plants (SDP) basically does not solve the problem of purification of fats and oils
Using mobile tricanter device substantially changes the attitude of waste processing to SDP
The temperature influence causes the tensile residual stresses (RS) and contrarily, the plastic deformation leads to compressive RS
Summary
Actual state of technology of sewage disposal plants (SDP) basically does not solve the problem of purification of fats and oils. 16 W/mK) [4] which leads to insufficient heat distribution into chip and workpiece and to excessive heat accumulation in cutting zone This heat generation can result in microstructural changes, local changes of chemical composition, surface discoloration or inducing undesirable tensile residual stresses. A situation may arise that there are the favorable compressive RS on the surface but with a steep RS gradient which can result in very high unfavorable tensile RS in the sub-surface layers, and vice versa [5]. For this reason, it is very important to investigate the RS gradient. For strain-induced martensite determination, e.g. the optical microscopy or Barkhausen noise analysis can be used
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