Hot working behaviour of experimental Ti-4.5Al-1 V-3Fe alloy with initial lamellar microstructure

Bodunrin, Michael Oluwatosin; Chown, Lesley H.; Merwe, J.W. van der; Alaneme, Kenneth Kanayo

doi:10.1007/s00170-019-04718-7

Cited by 11 publications

(9 citation statements)

References 81 publications

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“…In previous works, [ 7–9 ] it was established that the substitution of alloying elements that are highly priced with less‐expensive alternatives that perform similar functions would reduce the cost of producing titanium components. Bodunrin et al [ 10,11 ] reported that when developing experimental Ti–Al–V–Fe (α + β) alloys as cheaper alternatives to commercial Ti–6Al–4V, up to 10% of the total cost of making titanium alloys could be saved from the procurement of starting materials alone. This was accomplished by partially replacing costly vanadium with iron and lowering Al content from 6% to 4.5%.…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of iron‐containing experimental titanium alloys exposed to simulated body fluids

Leshetla

Klenam

Merwe

et al. 2022

Materials & Corrosion

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In this study, experimental Ti-6Al-1V-3Fe, Ti-4.5Al-1V-3Fe, and Ti-3Fe alloys, as well as commercial Ti-6Al-4V alloy that were scaled up utilizing vacuum induction melting technology, were assessed for corrosion performance in simulated body fluids. The selected simulated body fluids were 0.9 wt% NaCl solution and Hanks balanced salt solution (HBSS). Open circuit potential and linear polarization scans were performed to understand the corrosion performance of the alloys. The surface of the alloys was examined before and after exposure to corrosive solutions using scanning electron microscopy. The results show that all the alloys exhibit good corrosion performance in simulated body fluids. The corrosion rates were less than 0.5 mm/year. Owing to higher corrosion potential and lower corrosion rate, Ti-6Al-1V-3Fe and Ti-4.5Al-1V-3Fe had the best resistance to corrosion in 0.9 wt % NaCl and HBSS, respectively. All the alloys consist of a fully lamellar structure with α and β phases. There was no evidence of severe deterioration on the exposed surface of alloys in the simulated body fluids.

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Section: Introductionmentioning

confidence: 99%

Corrosion resistance of iron‐containing experimental titanium alloys exposed to simulated body fluids

Leshetla

Klenam

Merwe

et al. 2022

Materials & Corrosion

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“…The presence of precipitates, solutes, inclusions or reinforcements causes the activation energy to be 50% greater than the activation energy for self-diffusion. For high-stacking fault energy materials, the apparent activation energy is equivalent to or close to the activation energy for self-diffusion [38]. The results of this study show that the apparent activation energy for the two steels was: 473.08 kJ/mol (steel A) and 564.48 kJ/mol (steel B).…”

Section: Activation Energy and Stress Exponentmentioning

confidence: 53%

“…This characteristic behaviour of flow curves indicates a balance between work hardening and softening mechanisms, especially dynamic recovery (DRV for these steels [37]. The flow stress-strain curves for the two steels studied did not exhibit a clear peak and subsequent steady-state flow stress caused by DRX [33], [38]. Therefore, for most deformation conditions, the flow curves had increasing flow stress until the start of the saturation stress (σsat) region.…”

Section: Flow Stress-strain Curvesmentioning

confidence: 92%

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Maube¹,

Obiko²,

Merwe³

et al. 2023

Preprint

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This article reports on the comparative study of the hot deformation behaviour of virgin (steel A) and rejuvenated heat treatment creep-exhausted (steel B) P91 steels. Hot uniaxial compression tests were conducted on the two steels at the deformation temperature range of 900°C-1050°C and a strain rate range of 0.01-10s-1 to 0.6 strain using Gleeble® 3500 equipment. The results showed that the flow stress largely depends on the deformation conditions. The flow stress for the two steels increased with an increase in strain rate at a given deformation temperature and vice versa. The flow stress-strain curves exhibited a dynamic recovery as the softening mechanism. The material constants determined using Arrhenius constitutive equations were: stress exponent was: steel A (5.76) and steel B (6.67), and the apparent activation energy was: steel A (473.1 kJ mol-1) and steel B (564.5 kJmol-1). From these results, steel A exhibited better workability than steel B. Statistical parameters analyses showed that the flow stress for the two steels had a good correlation between the experimental and predicted data. Pearson’s correlation coefficient (R) was: steel A (0.97) and steel B (0.98). The Average Absolute Relative Error (AARE) values were: 7.62% (steel A) and 6.54% (steel B). The study shows that the Arrhenius equations can effectively describe the flow stress behaviour of P91 steel, and this method is applicable to the industrial metalworking process.

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“…As we know, the refinement of α lath favors the increase in the plasticity in near-α titanium alloys with the fully lamellar structure [33][34][35]. In addition, spheroidised TiC particles are beneficial for the enhancement in ductility of TiC-TMCs [27].…”

Section: Discussionmentioning

confidence: 98%

Control of the Lamellar Structure and Analysis of Tensile Properties of TiC/Ti-6Al-3Sn-9Zr-1.5Mo Composite Produced by In Situ Casting Technique

Zhu

Dong

Liu

et al. 2021

Metals

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In the present paper, new heat treatment was performed on 10 vol.% TiC/Ti-6Al-3Sn-9Zr-1.5Mo composite fabricated by an in situ casting technique. The aim is to obtain fully lamellar structure in matrix, control the lamellar structure quantitatively and understand the variation of the tensile properties of as-cast and heat-treated composites. For as-cast composite, matrix exhibited fully lamellar structure with some extent of basket-weave characteristics, and reinforcement was mainly in fine rod and strip shape. After β heat treatment, matrix microstructure was refined visibly. As the new cooling method was employed, wider α lath in matrix was obtained. The composite with very fine lamellar structure showed better yield strength (YS) in comparison with that with coarse lamellar microstructure below 650 °C. At 700 °C, fine grain strengthening cannot exert effective influence on tensile strength. It is proved that the enhanced YS is mainly ascribed to the refinement of α lath at ambient temperature. The heat-treated composites with wider α lath displayed excellent ductility at ambient temperature. Above 600 °C, the effect of α phase size on tensile elongation was negligible in the heat-treated composites, since matrix was softened.

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Hot working behaviour of experimental Ti-4.5Al-1 V-3Fe alloy with initial lamellar microstructure

Cited by 11 publications

References 81 publications

Corrosion resistance of iron‐containing experimental titanium alloys exposed to simulated body fluids

Corrosion resistance of iron‐containing experimental titanium alloys exposed to simulated body fluids

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Control of the Lamellar Structure and Analysis of Tensile Properties of TiC/Ti-6Al-3Sn-9Zr-1.5Mo Composite Produced by In Situ Casting Technique

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