Tensile properties of α-titanium alloys at elevated temperatures

Nawaya, Tarik; Beck, W.N.; Hehl, Axel von

doi:10.1051/matecconf/202032104016

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…However, the practical temperature limits for CP-Ti in structural applications range from less than 427 °C (800 °F) to approximately 538 °C or 595 °C (1000 °F or 1100 °F), contingent on the specific chemical composition of titanium-based alloys. Distinctive properties, including good conductivity, efficient thermal transfer and a favorable thermal expansion coefficient, have garnered attention for titanium’s application in diverse industries, such as electronics, automotive and aerospace [ 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Structural and Mechanical Properties of an Industrial Ti-6246 Alloy below β-Transus Transition Temperature through Thermomechanical Processing

Alluaibi,

Balkan,

Șerban

et al. 2024

Materials

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This study aims to investigate the effect of hot deformation on commercially available Ti-6246 alloy below its β-transus transition temperature at 900 °C, knowing that the α → β transition temperature of Ti-6246 alloy is about 935 °C. The study systematically applies a thermomechanical processing cycle, including hot rolling at 900 °C and solution and ageing treatments at various temperatures, to investigate microstructural and mechanical alterations. The solution treatments are performed at temperatures of 800 °C, 900 °C and 1000 °C, i.e., below and above the β-transus transition temperature, for 9 min, followed by oil quenching. The ageing treatment is performed at 600 °C for 6 h, followed by air quenching. Employing various techniques, such as X-ray diffraction, scanning electron microscopy, optical microscopy, tensile strength and microhardness testing, the research identifies crucial changes in the alloy’s constituent phases and morphology during thermomechanical processing. In solution treatment conditions, it was found that at temperatures of 800 °C and 900 °C, the α′-Ti martensite phase was generated in the primary α-Ti phase according to Burger’s relation, but the recrystallization process was preferred at a temperature of 900 °C, while at a temperature of 1000 °C, the α″-Ti martensite phase was generated in the primary β-Ti phase according to Burger’s relation. The ageing treatment conditions cause the α′-Ti/α″-Ti martensite phases to revert to their α-Ti/β-Ti primary phases. The mechanical properties, in terms of strength and ductility, underwent an important beneficial evolution when applying solution treatment, followed by ageing treatment, which provided an optimal mixture of strength and ductility. This paper provides engineers with the opportunity to understand the mechanical performance of Ti-6246 alloy under applied stresses and to improve its applications by designing highly efficient components, particularly military engine components, ultimately contributing to advances in technology and materials science.

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Section: Introductionmentioning

confidence: 99%

Optimizing Structural and Mechanical Properties of an Industrial Ti-6246 Alloy below β-Transus Transition Temperature through Thermomechanical Processing

Alluaibi,

Balkan,

Șerban

et al. 2024

Materials

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“…However, it has promising properties in terms of mechanical and fatigue strength as well as fracture resistance [5]. Nawaya et al [6] studied the tensile properties of α-titanium alloys (including Ti KS1.2ASN) at elevated temperatures and it was observed that the alloys reach the maximum formability in a certain temperature range (in the paper it was approx. 600-650 °C), where a further increase leads to a reduction of formability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Strain Rate on Formability of Titanium Alloy KS1.2ASN

Sikhamov

Ventzke

Dorn

et al. 2022

KEM

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Titanium alloys are widely used in aerospace and automotive industries due to their excellent mechanical properties, however, the formability is limited, which is an issue during forming. In the present study, the effect of temperature and strain rate on the tensile properties of the titanium α-alloy KS1.2ASN was investigated. It was observed that there is initially no gain in ductility with increase in temperature until 400 °C, however, maximum formability is reached at maximum tested temperature of 600 °C. EBSD analysis revealed that twinning is the main deformation mechanism at room temperature, however, sliding deformation becomes more pronounced with increasing temperature. An increase in strain rate leads to a decrease in elongation, but the influence is less pronounced compared to temperature.

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