Effect of FSP on Tribological Properties of Grade B89 Tin Babbitt.

Marcin Madej,Aleksandra Węglowska,Joanna Hrabia-Wiśnios,Beata Leszczyńska-Madej

doi:10.3390/ma14102627

Marcin Madej, Aleksandra Węglowska + Show 2 more

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https://doi.org/10.3390/ma14102627

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Abstract

The article presents the results of tests of the tribological properties of a bearing alloy on a tin matrix (B89) after surface modification by means of friction stir processing (FSP) with a Whorl tool. The samples were processed using two tool speeds of 280 and 580 RPM and a constant linear speed of 355 mm/min. The obtained results proved the significant influence of FSP on both the morphology of the precipitates and the investigated properties. Changes in the nature and course of friction were also observed, including the participation of individual wear mechanisms in the studied test conditions. The use of the 560 RPM tool rotation speed reduces the friction coefficient and the weight loss by about 30%. The flexural strength was also increased from 123 to 307 MPa.

Highlights

Appropriate sliding properties, strength and anti-corrosion properties determine the suitability of an alloy as a material for sliding bearing bushes
The aim of the study was to determine the effect of friction stir processing (FSP) using the Whorl tool, on the microstructure and tribological properties of the B89 bearing alloy
The application of FSP modification to the B89 alloy affects refinement of and a change in the morphology of CuSn precipitates, and the best results were achieved with the pin rotational speed of 560 RPM

Summary

Introduction

Appropriate sliding properties (including wear and galling resistance), strength and anti-corrosion properties determine the suitability of an alloy as a material for sliding bearing bushes. The combination of such diverse properties can only be achieved by alloys composed of two or more phases with different properties. The basic factor determining the application of Sn-Sb-Cu alloys for bearing alloys is the presence of hard SnSb compound crystals and acicular particles of the Cu6 Sn5 compound, evenly distributed in a soft, plastic tin-rich matrix [1,2,3,4,5]. Barykin et al [2] showed the influence of β phase (SnSb) particle size refinement on the change in bearing alloy wear intensity. The results of the tests carried out under conditions of technically dry friction presented by the authors proved that that the use of heat treatment reduces the wear intensity of the tested bearing alloy by

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