Structural Transformations in the Surface Layer During Multiradius Deforming Tool Processing
- Authors: Blumenstein V.Y.1, Kukareko V.A.1
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Affiliations:
- Issue: Vol 20, No 2 (2018)
- Pages: 75-86
- Section: MATERIAL SCIENCE
- URL: https://journals.rcsi.science/1994-6309/article/view/302067
- DOI: https://doi.org/10.17212/1994-6309-2018-20.2-75-86
- ID: 302067
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Abstract
Objective is to expand the technological possibilities of the process of hardening by surface plastic deformation (SPD) through the use of a multiradius roller (MP), creating a large hydrostatic pressure in the deformation zone. Materials and methods of investigation. Experimental ring samples Æ60 mm were made from annealed steel 45 GOST 1050-88 taken from one delivery. The hardness of the steel was 190 HV 10. The mechanical processing involved roughing and finishing turning with small allowances of 0.25 and 0.15 mm, respectively, with the feed of 0.07 mm/cycle and a spindle speed of 1600 cycle/min was made. Next, preliminary and final grinding was carried out by the means of abrasive paper with a small grain size. This processing made it possible to exclude the influence of roughness and defective layer on the quality of the processed surface of a part. Surface plastic deformation (SPD) by a MR roller Æ60 mm was carried out on a turning lathe using a special roller unit in two working modes, differing in the rolling force. The MP roll had the shape of a working surface profile in the form of a combination of successively located deforming elements (DE) with radii of constant magnitude disposed relative to each other with some displacement in the radial and axial directions. Results and discussions. It is established that the processing with a MR roller results in a substantial increase in the defects density of the crystal lattice in the surface layer, an increase in its microhardness approximately in two times and also in the deformation-induced dissolution of cementite particles Fe3C. It is shown that an increase in the rolling force of steel by means of a MR roller ensures deeper dissolution of cementite particles in the deformed surface layer and intensifies its hardening.
About the authors
V. Yu. Blumenstein
Email: blumenstein@rambler.ru
D.Sc. (Engineering), Professor, Kuzbass State technical University named after T.F. Gorbachev, blumenstein@rambler.ru
V. A. Kukareko
Email: v_kukareko@mail.ru
D.Sc. (Physics and Mathematics), Associate Professor, The Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus, v_kukareko@mail.ru
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