On the effect of a thermal treatment on the tensile and fatigue properties of weak zones of similar Ti17 linear friction welded joints and parent material

García, José Luis Simón; Gaslain, Fabrice; Morgeneyer, Thilo F.

doi:10.1016/j.matchar.2020.110570

Cited by 19 publications

(4 citation statements)

References 35 publications

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“…The titanium grain refinement that we achieved significantly increased mechanical properties of the material. Similar results have been reported in [41][42][43][44] where the authors improved microhardness, tensile strength, yield strength, fracture performance and fatigue strength. The grain refinement processes adopted in the aforementioned papers were different than that utilized in our studies.…”

Section: Materials Observationssupporting

confidence: 87%

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Bańczerowski

Pawlikowski

2021

Continuum Mech. Thermodyn.

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The pure titanium, as a biomaterial destined for production of load-demanding prostheses, requires thermo-mechanical processing to increase its strength. The most common way to achieve this is the method of grain fragmentation. Thermo-mechanical deformation of titanium is a complex process, which makes it very difficult to describe it by means of constitutive equations. Such constitutive relations are very useful as they can be implemented in the finite element method tools in order to simulate and optimize the whole process. Cylindrical specimens were compressed at elevated temperatures on a thermo-mechanical simulator. The tests were performed at four different strain rates (from 10$$^{\mathrm {-2}}$$ - 2 s$$^{\mathrm {-1}}$$ - 1 to 10 s$$^{\mathrm {-1}})$$ - 1 ) and at 775 K and 875 K temperatures. The collected data allowed us to create strain–stress graphs characterizing the process. Observations on the scanning electron microscope and scanning transmission electron microscope were done as well as the electron backscatter diffraction analysis, revealing significant grain fragmentation. The aim of the studies described in the paper was to verify and select a proper mathematical model for the process of titanium grain fragmentation obtained in a thermoplastic process. Four different constitutive models were considered. The calculation of theoretical stress values based on the Arrhenius-type equation, Anand viscoplastic model, Johnson–Cook model and Khan Huang-Liang model was done and compared to experimental results. The theoretical curves were generated and fitted to experimental, which made it possible to calibrate the constants in the mathematical models. The curve-fitting analyses showed that the Anand constitutive model described the titanium behaviour best.

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Section: Materials Observationssupporting

confidence: 87%

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Bańczerowski

Pawlikowski

2021

Continuum Mech. Thermodyn.

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“…Titanium alloys are widely used in many fields, such as aerospace, chemical industry, shipbuilding and biomedical science, because of their low density; high specific strength; and comprehensive properties, such as good corrosion resistance and fatigue properties [1,2]. TC17 titanium alloy is a typical α + β two-phase titanium alloy, which is often used to manufacture key components of aircraft engines, such as shafts, compressor disks and blades, due to its high strength, good fracture toughness, high hardening depth and wide forging temperature range [3,4]. Ti 2 AlNb alloy originates from Nb-modified Ti 3 Al-based alloy, mainly consisting of B2, O and α2 phases, and it has good plasticity, fracture toughness and creep resistance, which is expected to replace nickel-based superalloy for aero-engine compressors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Preheating and Post-Heating on the Microstructures and Mechanical Properties of TC17-Ti2AlNb Joint with Electron Beam Welding

Li,

Fu,

Lin

et al. 2024

Materials

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To enhance welding quality and performance, preheating and post-heating are usually employed on high-temperature materials, concurrently with welding. This is a novel technique in vacuum chamber electron beam welding (EBW). TC17 and Ti2AlNb alloys are the hot topics in aero-engine parts, and the welding of dissimilar materials is also a broad prospect. To settle welding cracks of Ti2AlNb, EBW with preheating and post-heating was investigated on TC17 and Ti2AlNb dissimilar alloy, which improved the manufacturing technology on high-temperature materials. The dissimilar joint no longer had cracks after preheating, which exhibited excellent welding stability and metallurgical homogeneity, and preheating and annealing had an important effect on mechanical properties. The joint strength after 630 °C annealing is higher than that of TC17 alloy base metal (BM) and other annealing temperatures, reaching 1169 MPa at room temperature and 894 MPa at 450 °C tensile condition. The joint plasticity after 740 °C annealing is equivalent to TC17 BM. EBW with preheating improved the microstructure characteristics and enhanced the plasticity of Ti2AlNb alloy weld and dissimilar joint, which would contribute to the application of Ti2AlNb alloy and Ti2AlNb dissimilar parts.

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“…Ballat-Durand et al [6] explored a new heat treatment process for Ti17-Ti6242 LFWed joints to enhance tensile properties. García et al [7] evaluated the variation in the fatigue properties of Ti17 LFWed joints after heat treatment. The heat treatment made the joints comparable to the parent material (PM) in terms of fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

Microstructure characteristics and strain hardening behaviour of Ti17 linear friction welded joints

He,

Wu,

Zhang

et al. 2023

Science and Technology of Welding and Joining

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This study investigated the microstructure variations in Ti17 linear friction welded joints and evaluated the effect of strain rate and post weld heat treatment on the strain hardening behaviour. The welded zone of the as-welded joints consists of equiaxed β grains, while the prior-β grains in the thermal mechanical affected zone are severely deformed. After heat treatment, fine needlelike α S precipitates dispersed in the β matrix strengthen the tensile properties. The fracture mechanism transforms from brittle to ductile. The strain hardening capacity and exponent are negatively correlated with strain rate. At higher strain rates, the strain rate sensitivity increases during the initial stage of deformation.

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On the effect of a thermal treatment on the tensile and fatigue properties of weak zones of similar Ti17 linear friction welded joints and parent material

Cited by 19 publications

References 35 publications

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Effect of Preheating and Post-Heating on the Microstructures and Mechanical Properties of TC17-Ti2AlNb Joint with Electron Beam Welding

Microstructure characteristics and strain hardening behaviour of Ti17 linear friction welded joints

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