NEW SEVERE PLASTIC DEFORMATION METHOD FOR 316L MEDICAL GRADE STEEL PROCESSING NEW SPD METHOD FOR 316L STEEL PROCESSING

In this paper, a new method for bulk severe plastic deformation (SPD) processing is presented. The method is based on upsetting of prismatic samples in axial direction until it reaches certain height, while the length is increased along the mould length. Since the width of the sample is constant, th...

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Bibliographic Details
Published in:Acta Technica Corvininesis 2020-01, Vol.13 (1), p.13-16
Main Authors: Vilotić, Marko, Dačević, Nemanja, Milutinović, Mladomir, Movrin, Dejan, Siðanin, Leposava
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Biocompatibility
Corrosion resistance
Dies
Fibroblasts
Friction
Grain size
Intrusion
Laboratories
Mechanical properties
Metal fatigue
Metal forming
Methods
Microhardness
Plane strain
Plastic deformation
Recovery time
Room temperature
Stainless steel
Stress ratio
Surgical implants
Tensile strength
Titanium alloys
Transplants & implants
Upsetting
Workability
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Summary:In this paper, a new method for bulk severe plastic deformation (SPD) processing is presented. The method is based on upsetting of prismatic samples in axial direction until it reaches certain height, while the length is increased along the mould length. Since the width of the sample is constant, the plane strain state in the sample is present. After first upsetting, the sample is rotated for 90 degrees and is upset again. Number of upsetting passes depends on material failure and total accumulated plastic strain for the upsetting process is calculated as a sum of strains per upsetting pass. The material chosen for this study is 316L steel, widely used for medical implants. Review on this subject at SCOPUS database showed that severe plastic deformation on 316L steel is scarcely used. Therefore, the results of this research would be promising. After the upsetting at room temperature, material exhibit improved tensile strength and microhardness, while workability is slightly reduced. Improved mechanical properties allow to reduce the dimensions of implants made of the SPD processed materials compared to conventionally produced implants, while keeping the same implant function. Smaller implant dimensions mean faster post operational recovery time for patient and less intrusion in patient's body during surgical operations. Additional advantage of the new die presented in this study is that the die can be also used for workability examination for triaxility stress ratio ß ~ -1.73.
ISSN:2067-3809