A detailed analysis of the structural, morphological characteristics and micro-abrasive wear behavior of nitrided layer produced in a (CP-Ti), aþ13 (Ti-6Al-4V), and 13 (TNZ33) type Ti alloys

Author(s)

Rossi, Mariana Correa ; Kuroda, Pedro Akira Bazaglia ; de Almeida, Larissa Solano ; Rossino, Luciana Sgarbi ; Afonso, Conrado Ramos Moreira

• Document type: Journal article
• Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 27, p. 14-pg., 2023-10-19.

Abstract

The present work aimed to create a hard surface on a titanium surface via plasma nitriding to improve microhardness and wear properties of the as-cast (alpha-CP-Ti (CP-Ti), alpha+beta-Ti6Al4V (Ti-Al-4V), and beta-Ti-33Nb-33Zr (TNZ-33) samples. For the nitriding process, two temperature conditions (650 degrees C and 700 degrees C) were used. The presence of nitrides was evaluated by XRD. The microstructure and chemical composition were studied by electron microscopy and EDS. The roughness was evaluated by confocal microscopy. The microhardness and wear properties were analyzed using the Vickers microhardness and micro-abrasive wear test. Plasma nitriding led to the formation of TiN on CP-Ti, TiN, and Ti2N on Ti-6Al-4V, and TiN and ZrN on TNZ-33 samples. At 700 degrees C, the TiN increased on CP-Ti, while the Ti2N increased for Ti-6Al-4V and the ZrN increased for TNZ-33. The length of the nitride layer decreased when the temperature increased for CP-Ti and Ti-6Al-4V samples. However, for the TNZ33 alloy, the layer increased from 6.3 to 7.6 mu m. The chemical analyses confirmed the presence of nitrogen on the substrate surfaces. After the nitriding process, all materials significantly increased the hardness. The hardness after plasma nitriding can be followed by: CP-Ti > TNZ-33> Ti-6Al-4V (at 650 degrees C); CP-Ti > Ti-6Al-4V > TNZ-33 (at 700 degrees C). The wear properties of all samples were improved after plasma nitriding treatment.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (AU)

• FAPESP's process: 21/03865-9 - Influence of surface modifications on bioactivity and (tribo) corrosion of beta Ti-Nb-(Zr) alloys with low elastic modulus for application as implant
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/26517-6 - Influence of the microstructure and phases on surface functionalization of beta Ti-25Ta-xZr- alloys system
• Grantee: Pedro Akira Bazaglia Kuroda
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/18293-8 - Titanium alloys: phase transformations and additive manufacturing applied to obtaining functionally graded materials
• Grantee: Rubens Caram Junior
• Support Opportunities: Research Projects - Thematic Grants