An image analysis study of pit formation on Ti–6Al–4V

Codaro, Eduardo Norberto; Nakazato, Roberto Zenhei; Horovistiz, A.L.; Ribeiro, L. M. F.; Ribeiro, Rosinei Batista; Hein, L. R. O.

doi:10.1016/s0921-5093(02)00218-6

Cited by 50 publications

(20 citation statements)

References 7 publications

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“…The multiple phases of Ti-6Al-4V exhibited differences in thermodynamic stability, forming corrosion microcells during the electrochemical testing. Codaro et al 45 demonstrated that point corrosion frequently occurred in the interface between a and b phases in the Ti-6Al-4V alloy. On the other hand, the TTHZ alloy showed better corrosion resistance than those of CP-Ti and Ti-6Al-4V, mainly because, aer adding alloy elements including Ta, Hf, and Zr, more stable and protective passive lms were formed on the surface.…”

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confidence: 99%

Effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion resistance of a β type Ti–Ta–Hf–Zr alloy

et al. 2017

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Titanium and some of its alloys have become increasingly important for biomedical materials due to their high specific strength, good corrosion resistance, and excellent biocompatibility compared to the biomedical stainless steels and cobalt-chromium based alloys. In this study, a b type TTHZ alloy (Ti-40Ta-22Hf-11.7Zr) was prepared with the cold-crucible levitation technique. The corrosion behavior and the effects of solution treatment (ST) and aging on the microstructures and mechanical properties of the TTHZ alloy were investigated using electrochemical analysis, XPS (X-ray photoelectron

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confidence: 99%

Effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion resistance of a β type Ti–Ta–Hf–Zr alloy

et al. 2017

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“…The GTA weldment consists of coarse prior b grains with fine acicular a microstructure, which increases the fraction of a/b interfaces. [34] According to Codaro et al [35] a-b interfaces act as the preferential dissolution locations and increase the corrosion rate. Such an acicular structure also has been reported to show a higher corrosion rate for CP titanium (grade 2) in LiBr solution.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of Friction Stir-Processed and Gas Tungsten Arc-Welded Ti-6Al-4V

Atapour

Pilchak

Frankel

et al. 2010

Metall Mater Trans A

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The corrosion behavior of the investment-cast Ti-6Al-4V alloy in 5-pct HCl solution was investigated after gas tungsten arc welding and friction stir (FS) processing. The FS-processed samples exhibited superior corrosion behavior compared with the base metal and the arc-welded samples. The inferior corrosion resistance of the arc weldment was attributed to the acicular a and b microstructure and the alloying element partitioning between the phases. This was confirmed by scanning electron microscopy evaluations of the surface of specimens that had been immersed 50 hours in 20-pct HCl at 308 K (35°C). In addition, the results indicated that vanadium as an alloying element has a detrimental effect on the corrosion performance of Ti6Al-4V alloy in an HCl solution.

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“…While the traditional approach involved the direct observation of the acquired images by human experts, resulting in a qualitative analysis of the results, with the diffusion of digital image processing techniques the analysis process became faster, simpler and more precise. Computer Vision techniques have been used in Metallography Image Analysis [2,3] to study the properties of sinteredsteel and the nickel-based superalloy [4], for the automated classification of heat resistant steel structures [5], for segmenting the phases of high strength low alloy steel [6], to study the pit formation on a titanium alloy [7], and for the segmentation of a of a two-phase Ti-6Al-2Mo-2Cr-Fe titanium alloy [8]. Tejrzanowski et al [9] presented a review of different techniques for the estimation of the size, shape and spatial distribution of structural elements of engineering materials.…”

Section: Introduction and Previous Workmentioning

confidence: 99%

An Automated Visual Inspection System for the Classification of the Phases of Ti-6Al-4V Titanium Alloy

Ducato

Fratini

Cascia

et al. 2013

Computer Analysis of Images and Patterns

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Abstract. Metallography is the science of studying the physical properties of metal microstructures, by means of microscopes. While traditional approaches involve the direct observation of the acquired images by human experts, Computer Vision techniques may help experts in the analysis of the inspected materials. In this paper we present an automated system to classify the phases of a Titanium alloy, Ti-6Al-4V. Our system has been tested to analyze the final products of a Friction Stir Welding process, to study the states of the microstructures of the welded material.

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An image analysis study of pit formation on Ti–6Al–4V

Cited by 50 publications

References 7 publications

Effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion resistance of a β type Ti–Ta–Hf–Zr alloy

Effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion resistance of a β type Ti–Ta–Hf–Zr alloy

Corrosion Behavior of Friction Stir-Processed and Gas Tungsten Arc-Welded Ti-6Al-4V

An Automated Visual Inspection System for the Classification of the Phases of Ti-6Al-4V Titanium Alloy

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