EFFECT OF FRICTION ON THE MICROMECHANICAL PROPERTIES OF AISI 316L AUSTENITIC STEEL

Daria Grabco,Olga Shikimaka,Daria Topal,Constantin Pyrtsac

doi:10.52326/jes.utm.2021.28(2).02

Abstract

In this paper, we investigate the possibility of using the friction method for modifying the microstructure and mechanical properties in the near-surface regions of AISI 316L austenitic steel specimens for the purpose of its practical application. It is shown that a region of severe plastic deformation arises near the friction surface, which transforms the initial fine-grained polycrystalline steel structure into a homogenized zone consisting of a deformed structure with plastic slip bands and weakly pronounced grain boundaries. The change in the microscopic structure results in an increase in this zone of values of micromechanical characteristics, such as microhardness (H), Young's modulus (E), plasticity index (H/E) and resistance index (H3/E2). The obtained results are of interest for the potential use of AISI 316L steel in medicine.

Highlights

It is well known that the resistance that occurs when two surfaces are in contact with each other and are subjected to a force that makes them slide relative to each other is so called frictional force
One can clearly see that crystallites have different shapes and orientations on the surface under study, and relative to their location in the volume, which is confirmed by the different microstructure and color of the crystallites
The results of this paper demonstrates that different friction modes cause plastic changes in the deformed zone of the tested sample

Summary

Introduction

It is well known that the resistance that occurs when two surfaces are in contact with each other and are subjected to a force that makes them slide relative to each other is so called frictional force. The study of the modification of the microstructure as a result of friction and the determination of the mechanical parameters were carried out on the cross sections of the samples.

Results

Conclusion