Influence of aging heat treatment on microstructure and tensile properties of laser oscillating welded TB8 titanium alloy joints

Lei, Zhenglong; Chen, Yuan; Ma, Shengchong; Zhou, Heng; Liu, Jingtao; Wang, Xuefeng

doi:10.1016/j.msea.2020.140083

Cited by 13 publications

(4 citation statements)

References 30 publications

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“…3 demonstrates that as the heat treatment process and ageing period rise, the primary α phase and the grain globulars steadily increase, but the volume fraction of α/α′ phase remains unchanged considerably (Table 2). The morphological characteristic of phases changed noticeably; many secondary α phases precipitated in the matrix seemed to merge together and develop, and some β phases disappeared, according to previous study [39][40][41]. The coarse α phase can be seen in Fig.…”

Section: Discussion Of the Centrifugal Casting For Orthopedic Implant...supporting

confidence: 54%

Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations

Oktikawati,

Riastuti,

Damisih

et al. 2024

EEJET

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The alternative Ti-6Al-7Nb alloy has gained extensive progression due to its ability to eliminate the cytotoxicity of vanadium (V) in Ti-6Al-4V alloy for orthopedic implants. The production of titanium alloys by centrifugal casting shows significant potential to reduce costs. Heat treatment and aging can tailor the microstructure and improve the corrosion resistance of titanium alloys. This study examines the effects of various ageing times on the microstructure and corrosion resistance of a centrifugal cast Ti-6Al-7Nb alloy that has previously been heated and treated at a temperature of 1050 °C, and subsequently cooled to room temperature in argon atmosphere gas. Ageing was carried out at a temperature of 550 °C with variable times of 0, 4, 6, and 8 hours. The surface morphology, metal phase changes, and electrochemical characterization were tested using an optical microscope (OM), X-ray diffraction (XRD), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS). The basket-weave microstructure is formed where globularization occurs in some phases as ageing time increases. Increasing the FWHM α value is correlated with increasing the amount of α' martensite phase. As an ageing time enhances, the temperature might offer a greater driving constrain for the nucleation and expansion of the lamellar phase (α). Ageing of 8 hours has the lowest corrosion rate, 0.0023 mpy and highest corrosion resistance, 90457 Ω∙cm2, due to the partially bimodal structure and grain refinement with a smallest grain size of 327.87 µm. Tafel polarization results show that all passivated samples are stable in the Solution Body Fluid (SBF). This work can be used as a starting point for developing microstructural evolution in titanium alloys

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Section: Discussion Of the Centrifugal Casting For Orthopedic Implant...supporting

confidence: 54%

Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations

Oktikawati,

Riastuti,

Damisih

et al. 2024

EEJET

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“…We have to recognize that ageing regime used in this paper (500 o C, 8 hours, standard for a conventional STA treatment of this alloy [32]) was not properly selected for the case of the RHT. It was found earlier that the alloys treated with using of the rapid heating require modified ageing regimes, i.e., higher ageing temperatures and/or controlled heating rate to the ageing temperature [20,32,33]. is requirement came from peculiarities of the metastable ß phase formed upon rapid heating, first of all, of its compositional inhomogeneity.…”

Section: Discussionmentioning

confidence: 99%

Response of Partly Recrystallized Microstructure to the Rapid Heat Treatment in TC18 Alloy

Qiu

Ивасишин

Dong

et al. 2022

Advances in Materials Science and Engineering

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The response of TC18 (Ti-5Al-5Mo-5V-1Cr-1Fe) alloy bar to the rapid heat treatment (20 K•s−1) in the 850 to 950°C temperature range followed by ageing at 500°C for 8 hours was studied in this paper. Starting material was only partly recrystallized; share of nonrecrystallized part was not uniform along the bar and consisted 10 to 50% of the cross section. Although both parts, recrystallized and nonrecrystallized, had α+β phase composition, the morphology of a phase in them was different. Due to that and, presumably, to different defect density, the two parts behaved differently upon rapid heating and ageing keeping the properties fluctuated depending on the fraction of the nonrecrystallized part in the particular specimen since nonrecrystallized material remained harder and stronger and therefore more inclined for microcracks to nucleate and grow. Such fluctuation masked a possible temperature dependence of the properties. It resulted in a strength level of around 1700 MPa which is well above the typical strength of this alloy achieved with conventional thermal hardening. Thus, rapid heat treatment can be successfully used to process an extremely high strength condition in titanium alloys to increase their competitiveness in many attractive applications.

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“…For most structural materials, the properties of strength and toughness are usually mutually exclusive [4]. Moreover, researchers have been able to control the size, content, and distribution of the phases in the tissues through a variety of strengthening strategies to achieve strengthening and toughening effects [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Regulation of Microstructure to Optimize Mechanical Properties of Ti-15Mo-3Al-2.7Nb-0.2Si via Solution-Duplex Ageing

Kang

Jiang

et al. 2023

Metals

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The production of alloys with high strength and toughness concurrently is still a difficult challenge. Here, we designed a simple solution-ageing heat treatment system to control the morphology and density of α in Ti-15Mo-3Al-2.7Nb-0.2Si via different heat treatment temperatures. The experimental results show that Ti-15Mo-3Al-2.7Nb-0.2Si exhibits a synergistic combination of tensile strength (1364 MPa), plasticity (7.8% elongation), and fracture toughness (101 MPa·m1/2) through solutions in the α/β biphasic region and duplex ageing. Notably, the strength of the alloy after the second step of the ageing process is increased by 15% compared with that after the first step of the ageing process. However, there is less than a 5% reduction in the fracture toughness. TEM observations show that the matrix continues to precipitate denser secondary α during duplex ageing, which causes the strength to increase significantly and causes the fracture toughness to weaken. Our work may provide a novel method to optimize the mechanical properties of alloys by controlling the precipitates.

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Influence of aging heat treatment on microstructure and tensile properties of laser oscillating welded TB8 titanium alloy joints

Cited by 13 publications

References 30 publications

Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations

Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations

Response of Partly Recrystallized Microstructure to the Rapid Heat Treatment in TC18 Alloy

Regulation of Microstructure to Optimize Mechanical Properties of Ti-15Mo-3Al-2.7Nb-0.2Si via Solution-Duplex Ageing

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