Achieving an ideal combination of strength and plasticity in additive manufactured Ti–6.5Al–2Zr–1Mo–1V alloy through the development of tri-modal microstructure

Zhang, Yuqi; Zhang, Sheng; Zou, Zhiyi; Shi, Yusheng

doi:10.1016/j.msea.2022.142944

Cited by 22 publications

(10 citation statements)

References 42 publications

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“…Titanium alloys are widely used in national defense, military, aerospace, green energy and other industries because of their excellent properties such as high strength, good toughness and low density [1]. Due to the poor machining performance of titanium alloy, the traditional process is difficult to meet the machining requirements of high performance and large size titanium alloy structural parts [2][3]. Conventional manufacturing of large titanium alloy components has many problems, such as complex technological process, low material utilization rate, high cost, low efficiency and insufficient flexibility in multi-process composite manufacturing [4][5].…”

Section: Introductionmentioning

confidence: 99%

Multi-wire arc additive manufacturing of Ti basic heterogeneous alloy: Effect of deposition current on the microstructure, mechanical property and corrosion-resistance

Jiang

Li²,

Zong³

et al. 2022

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Multi-wire arc additive manufacturing of Ti basic heterogeneous alloy: Effect of deposition current on the microstructure, mechanical property and corrosion-resistance

Jiang

Li²,

Zong³

et al. 2022

Journal of Alloys and Compounds

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“…When the heat treatment temperature is below the β transus temperature, the undissolved α phase plays a role in pinning the β grain boundaries, so that its structure can be retained [12,30]. Thus, the columnar structure can only be eliminated when the temperature exceeds the β transus temperature [32,42]. In the HT800 sample, the equiaxed α grains were observed to have preferentially formed along the prior β boundaries (Figure 4c).…”

Section: Microstructures Of Single Heat Treatment Samplesmentioning

confidence: 99%

“…However, the proportion of equiaxed grains was too small to produce a significant impact on improving the overall mechanical properties. The latest research suggests that multiple annealing at different temperatures can effectively spheroidize the microstructure [25,30,32]. Therefore, a HLT treatment regime was proposed to further optimize the microstructure.…”

Section: Microstructures Of Multi-step High-to-low-temperature Heat T...mentioning

confidence: 99%

“…Until now, there have been no reports of achieving a trimodal microstructure in SLM Ti-6Al-4V alloy, which is considered to provide excellent comprehensive mechanical properties [32]. In addition, current research mainly focuses on the influence of single heat treatment on microstructure and properties, whereas the effect of heat treatment on the anisotropy of mechanical properties is rarely reported [16,17,33].…”

Section: Introductionmentioning

confidence: 99%

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Achieving an Excellent Strength and Ductility Balance in Additive Manufactured Ti-6Al-4V Alloy through Multi-Step High-to-Low-Temperature Heat Treatment

Wang,

Lei,

2023

Materials

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Selective laser melting (SLM) can effectively replace traditional processing methods to prepare parts with arbitrary complex shapes through layer-by-layer accumulation. However, SLM Ti-6Al-4V alloy typically exhibits low ductility and significant mechanical properties anisotropy due to the presence of acicular α′ martensite and columnar prior β grains. Post-heat treatment is frequently used to obtain superior mechanical properties by decomposing acicular α′ martensite into an equilibrium α + β phase. In this study, the microstructure and tensile properties of SLM Ti-6Al-4V alloy before and after various heat treatments were systematically investigated. The microstructure of the as-fabricated Ti-6Al-4V sample was composed of columnar prior β grains and acicular α′ martensite, which led to high strength (~1400 MPa) but low ductility (~5%) as well as significantly tensile anisotropy. The single heat treatment samples with lamellar α + β microstructure exhibited improved elongation to 6.8–13.1% with a sacrifice of strength of 100–200 MPa, while the tensile anisotropy was weakened. A trimodal microstructure was achieved through multi-step high-to-low-temperature (HLT) heat treatment, resulting in an excellent combination of strength (~1090 MPa) and ductility (~17%), while the tensile anisotropy was almost eliminated. The comprehensive mechanical properties of the HLT samples were superior to that of the conventional manufactured Ti-6Al-4V alloy.

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“…As the result, while Ti-6Al-4V is commonly used as a structural material in the aerospace industry, TA15 is widely applied to the load-bearing components in aircraft and engines, which operate at high temperatures for extended periods [16]. Lately, L-PBF has been successfully adopted to process TA15 alloy [17,18]. Wu et al [19] report that TA15 produced via L-PBF could exhibit excellent tensile strength both at room and elevated temperature, due to grain refinement and nano-scale twins.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Additive Manufactured Ti-6.5Al-2Zr-1Mo-1V Alloy

Zhang

et al. 2022

Materials

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Ti-6.5Al-2Zr-1Mo-1V (TA15), widely used in the aerospace industry, is a medium- to high-strength, near-α titanium alloy with high aluminium equivalent value The TA15 fabricated via laser powder bed fusion (L-PBF) normally presents a typical brittle appearance in as-built status, with high strength and low ductility. In this study, the microstructure and properties of L-PBF TA15 were engineered by various heat treatments below the β-transus temperature (1022 °C). After heat treatment, the original acicular martensite gradually transforms into a typical lamellar α + β dual-phase structure. Withannealing temperature increases, the lamellar α phase thickened with a decreased aspect ratio. Globularisation of the α grain can be noticed when annealing above 800 °C, which leads to a balance between strength and ductility. After heat treatment between 800–900 °C, the desired combination of strength and ductility can be achieved, with elongation of about 12.5% and ultimate tensile strength of about 1100 Mpa.

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Achieving an ideal combination of strength and plasticity in additive manufactured Ti–6.5Al–2Zr–1Mo–1V alloy through the development of tri-modal microstructure

Cited by 22 publications

References 42 publications

Multi-wire arc additive manufacturing of Ti basic heterogeneous alloy: Effect of deposition current on the microstructure, mechanical property and corrosion-resistance

Multi-wire arc additive manufacturing of Ti basic heterogeneous alloy: Effect of deposition current on the microstructure, mechanical property and corrosion-resistance

Achieving an Excellent Strength and Ductility Balance in Additive Manufactured Ti-6Al-4V Alloy through Multi-Step High-to-Low-Temperature Heat Treatment

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Additive Manufactured Ti-6.5Al-2Zr-1Mo-1V Alloy

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