Authors: K.P. Petrenko

Title of the article: The effect of diamond burnishing parameters on surface integrity of rotary pumps parts

Year: 2023, Issue: 4, Pages: 36-48

Branch of knowledge: 2.5.6. Engineering technology

Index UDK: 621.787

DOI: 10.26730/1999-4125-2023-4-36-48

Abstract: In this paper results of surface roughness and hardening research in processes of diamond burnishing of austenitic stainless steel specimens are presented. It is well-known that surface roughness is one of the key factors that impacts on wear resistance. In this connection the work was carried out to examine diamond burnishing conditions on surface roughness parameters. It was found that diamond burnishing contributes to drastic reduction of surface roughness. Also, it was established that burnishing force increase to certain limits causes reduction of surface roughness parameters, while further force boosting produces increased surface roughness. This effect occurs due to «over-hardening» and partial damage of surface layer. When employing indenter with 4 mm tip radius, surface roughness parameters reduction is observed throughout the whole range of burnishing forces. When indenter with 0.8 mm tip radius is in use, the minimal values of surface roughness parameters correspond to 40 kg burnishing force. Further force increase leads to surface roughness growing. As the burnishing force increases the hardening ratio grows unevenly under a variety of tool tip radii. The hardening ratio ranges from 0.15 to 0.82 (15 to 82%) depending on burnishing force and tool tip radius. It has been established that burnishing force increasing together with tool tip radius decreasing results in surface micro hardness rising due to growing specific pressure and metal plastic flow. Results obtained demonstrate that diamond burnishing is a suitable and effective method for surface roughness reduction, favorable surface topography and wear resistance increasing of rotary pumps parts.

Key words: rotary pumps surface integrity stainless steels diamond burnishing surface roughness surface hardening

Receiving date: 19.05.2023

Approval date: 15.09.2023

Publication date: 27.09.2023

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