Strength and Fracture Mechanism of an Ultrafine-Grained Austenitic Steel for Medical Applications.

Gennadiy V Klevtsov,Natal’Ya A Klevtsova,Timur B Minasov,Maxim N Tyurkov,Mikhail L Linderov,Ruslan Z Valiev,Marina M Abramova,Arseniy G Raab

doi:10.3390/ma14247739

Gennadiy V Klevtsov, Natal’Ya A Klevtsova + Show 6 more

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https://doi.org/10.3390/ma14247739

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Abstract

In this paper, we study the corrosion-resistant austenitic steel Fe-0.02C-18Cr-8Ni for medical applications. The microstructure and mechanical properties (tensile mechanical properties, torsional strength, impact toughness, and static and cyclic crack resistance) under different types of loading of the steel are investigated. The results are compared for the two states of the steel: the initial (coarse-grained) state and the ultrafine-grained state produced by severe plastic deformation processing via equal-channel angular pressing. It is demonstrated that the ultrafine-grained steel 0.08C-18Cr-9Ni has essentially better properties and is very promising for the manufacture of medical products for various applications that experience various static and cyclic loads during operation.

Highlights

A wide use of “preserving” surgical technologies that enable minimizing traumatization during surgery and reducing the time of post-surgical rehabilitation in traumatology and maxillofacial surgery, involves miniaturization of medical products; for example, various implants, plates for bone osteosynthesis, and pins and screws for the fixation of plates and bone fragments
These requirements are fully satisfied by a new class of bulk nanostructured metallic materials with an ultrafine-grained (UFG) structure produced by severe plastic deformation (SPD) processing [5,6,7]
The aim of the present study is to evaluate the strength and fracture mechanisms under different types of loading of a UFG austenitic steel for medical applications in comparison with its coarse-grained (CG) counterpart

Summary

Introduction

A wide use of “preserving” surgical technologies that enable minimizing traumatization during surgery and reducing the time of post-surgical rehabilitation in traumatology and maxillofacial surgery, involves miniaturization of medical products; for example, various implants, plates for bone osteosynthesis, and pins and screws for the fixation of plates and bone fragments. The task of miniaturization of medical products cannot be solved without the use of materials having a high biocompatibility and a high set of mechanical properties under different types of loading [2,3,4]. These requirements are fully satisfied by a new class of bulk nanostructured metallic materials with an ultrafine-grained (UFG) structure produced by severe plastic deformation (SPD) processing [5,6,7]. The testing of plates for medical applications in maxillofacial surgery, produced from SPD-processed nanostructured Ti, showed that the mechanical properties and fatigue endurance of such plates were higher by a factor of almost 1.5 as compared to plates from conventional coarse-grained Ti [2]

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