Authors: K.S. Mitrofanova

Title of the article: The effect of surface plastic deformation by a multiradius roller on the structural-phase state and microhardness of steel 45 samples

Year: 2022, Issue: 3, Pages: 4-12

Branch of knowledge: 05.02.08 Engineering Technology

Index UDK: 621.787, 621.789

DOI: 10.26730/1999-4125-2022-3-4-12

Abstract: The article presents the results of a study of the structure and microhardness of the surface layer of 45 steel (ASTM 1045) samples after surface plastic deformation by a multiradius roller. The aim of the work is to establish the features of the structural-phase state and microhardness of samples made of 45 steel, depending on the intensity of the treatment mode with a multiradius roller. The methods of optical and atomic force microscopy were applied, which made it possible to study the structure of steel 45 at the micro and mesolevels in the initial state and after rolling with a multiradius roller. The use of these techniques made it possible to determine the parameters of the structure of steel 45: grain and subgrain sizes, their uniformity; deformation relief; location and dimensions of the localized deformation band and the intensively deformed layer formed as a result of processing with a multiradius roller. The data obtained indicate that, despite the intensive running-in modes leading to a decrease in roughness, a significant increase in microhardness and grinding of the structure of steel 45, the destruction of the surface layer of the part does not occur. In addition, it is shown that rolling with the greatest effort leads to the formation of a localized deformation band in the surface layer, in the zone of which high microhardness values are observed.

Key words: surface plastic deformation multiradius roller microhardness structural-phase state localized deformation band optical microscopy atomic force microscopy

Receiving date: 19.05.2022

Approval date: 07.06.2022

Publication date: 07.07.2022

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