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ENEBI 2022
VII Encontro Nacional de Engenharia Biomecânica
BIOCOMPATIBILITY IMPROVEMENT OF UNS S32750 DUPLEX STAINLESS STEEL BY INDUCTIVELY COUPLED RADIOFREQUENCY PLASMA NITRIDING
Submission Author:
Andre Bonfante de Souza , PR
Co-Authors:
Andre Bonfante de Souza, thiago dunaiski, euclides alexandre bernardelli, Marcio Mafra
Presenter: Andre Bonfante de Souza
doi://10.26678/ABCM.ENEBI2022.EEB22-0057
Abstract
Nitriding is a thermochemical treatment based on nitrogen diffusion on ferrous alloys to improve its mechanical performance and its corrosion behavior. The increase in nitrogen content during nitriding promotes surface phase transformation of stainless steels, leading to increased biocompatibility of the material. The present work evaluated the effect of temperature on the inductively coupled radio frequency plasma nitriding of UNS S32750 duplex stainless steel. The samples were treated in inductively coupled radio frequency plasma with direct current bias (RF-DC) on a tubular reactor. Plasma nitriding treatments were carried out for 4 hours at 400 and 450 ºC (673 and 723 K), resulting in expanded austenite layer thickness up to 10,5 µm and average microhardness up to 1767 HK0,05. The maximum nitrogen content obtained was approximately 11,5%wt. It was observed that nitrogen diffusion is phase-dependent, but, at higher temperatures, expanded-phase layer formed on both previous phases have equivalent nitrogen content.
Keywords
duplex stainless steel, radiofrequency plasma, inductively coupled plasma, stainless steel biocompatibility, plasma nitriding
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