Temperature sensitivity of mechanical properties and microstructure during moderate temperature deformation of selective laser melted Ti-6Al-4V alloy

Song, Jingwen; Han, Yuanfei; Fang, Minhan; Hu, Fuguo; Liu, Ke; Liu, Ying; Lei, Liming; Lü, Weijie

doi:10.1016/j.matchar.2020.110342

Cited by 20 publications

(6 citation statements)

References 30 publications

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“…Generally, the dominance of the type 2 boundaries in the basketweave structure of the linear scan strategy aligns well with microstructures for E-PBF Ti-6Al-4 V reported in the literature [15,66]. The increased fraction of type 4 boundaries at the bottom of the Dehoff scan strategy is less expected, and more similar to the grain boundary distributions in martensitic microstructures from traditionally processed [40,42] or laser powder bed fusion Ti-6Al-4 V [20,43,75]. The grain boundary distribution of the random scan strategy appears similar to the Dehoff though the microstructure is markedly different.…”

Section: Grain Boundary Distributionsupporting

confidence: 85%

3D characterization of microstructural evolution and variant selection in additively manufactured Ti-6Al-4 V

et al. 2021

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Ti-6Al-4 V is a popular alloy in additive manufacturing (AM) due to its applications in the biomedical implants and aerospace industries where the complex part geometries allowed by AM provide cost and performance benefits. Ti-6Al-4 V goes through a b ? a' transformation after solidification which is known to experience variant selection, e.g., through the formation of clusters of variants which, when situated together, partially accommodate the strain of the phase transformation. During electron beam powder bed fusion AM, an in situ decomposition of a' martensite occurs during the cyclic reheating caused by melting successive layers, resulting in a ? b microstructures. How variant selection influences the evolution beyond the initial rapid cooling remains an open question. Using 3D electron backscatter diffraction, we provide a clearer understanding without ambiguity from sectioning effects of how a' decomposes into microstructures with distinct morphologies and variant/intervariant distributions. We extract quantitative 3D information on the various intervariant boundaries networks formed in samples printed using three different electron beam scanning strategies. This shows that differing mechanisms during the decomposition result in a shift from self-accommodating clusters in an acicular microstructure, to either the preferred growth of six variants in a basketweave microstructure, or to a colony microstructure where variant selection is determined by prior-b grain boundaries. We propose a new representation of the misorientations arising from the Burgers orientation relationship, which we refer to as intervariant network diagram, to reveal how variant selection during the martensitic transformation and subsequent decomposition leads to the intervariant boundary networks observed. This holistic understanding of the microstructural evolution has the potential to allow tailoring of microstructures and properties for specific applications.

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Section: Grain Boundary Distributionsupporting

confidence: 85%

3D characterization of microstructural evolution and variant selection in additively manufactured Ti-6Al-4 V

et al. 2021

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“…Moreover, the working temperature (25 • C, 350 • C, 700 • C) was changed to detect the effect of temperature on the friction and wear properties of Ti-6Al-4V alloy and coating. It should be noted that 25 • C is the temperature at room temperature, and 350 • C is the normal working temperature of Ti-6AL-4V, which is widely used in aerospace, medical, and other fields [22]. However, 700 • C is not the normal working temperature of Ti-6Al-4V, which is obviously higher than the maximum service temperature of Ti-6Al-4V alloy, but lower than its β-transformation temperature (about 995 • C).…”

Section: Methodsmentioning

confidence: 99%

Study on Wear Resistance of Ti-6Al-4V Alloy Composite Coating Prepared by Laser Alloying

et al. 2021

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Titanium alloy has extensive applications in numerous fields, such as in aerospace, shipbuilding, petrochemical, and bio-medical. However, under the condition of high temperature (above 700 °C), it is difficult to meet the requirements of the performance of the turbine blades, piston rings, valves, etc. In this paper, the alloy powder is composed of Ni60A, TiN, Al, and Si in accordance with the proportion of 1:3:4:2 (mass ratio), and the composite coating, such as TiN, TiB, Ti5Si3, and Al3Ti were synthesized on Ti-6Al-4V alloy by Yttrium Aluminium Garnet(YAG) laser. The friction and wear experiments were carried out on Ti-6Al-4V alloy and alloyed coatings at different loads (3N, 6N, 9N), and different temperatures (25 °C, 350 °C, 700 °C). The impact of load and temperature on wear performance were analyzed by analyzing the friction traces. The results showed that the abrasion loss, wear width, and depth, wear volume, and wear ratio of the alloyed coatings were less than Ti-6Al-4V alloy, and the surface of furrow was shallow and the wear was less. However, under high temperature conditions, the alloy coating wears worse than Ti-6Al-4V alloy, and the high temperature wear resistance is not ideal.

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“…In addition, defects or inhomogeneity of materials according to process variables such as temperature, strain rate, and reduction rate in the process cause an increase in production unit costs. It is important to determine the optimal process conditions and clearly identify the high-temperature deformation behavior of the material in order to solve this problem [11][12][13][14][15][16]. Accordingly, research has been conducted steadily to optimize the forming process at minimal cost and to improve the quality of the product through considering forming defects and microstructure changes according to the recent development of the finite element analysis technology [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Variation and Evaluation of Formability According to High-Temperature Compression Conditions of AMS4928 Alloy

Lee

Jo²,

Choi³

et al. 2022

Applied Sciences

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Ti-6Al-4V alloys are used in various industrial fields such as aircraft parts due to its excellent specific strength and mechanical properties. A high-temperature forming technology has been applied because it is difficult to process complex shapes. During the high-temperature forming process, the microstructure changes significantly due to temperature, strain rate, reduction ratio, and other process variables, and mechanical properties of high-temperature molded products are changed accordingly. Therefore, in this study, a high-temperature compression test was performed on AMS4928, which is one of Ti-6Al-4V alloys used as a material for aircraft parts, and the severe plastic deformation and dead zone were confirmed in connection with the processing map. The changes in microstructure were comparatively analyzed. In addition, it was confirmed that there was a difference in formability due to grain refinement by dynamic recrystallization, and optimal high-temperature forming conditions were derived by linking and analyzing the formability and microstructural factors.

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Temperature sensitivity of mechanical properties and microstructure during moderate temperature deformation of selective laser melted Ti-6Al-4V alloy

Cited by 20 publications

References 30 publications

3D characterization of microstructural evolution and variant selection in additively manufactured Ti-6Al-4 V

3D characterization of microstructural evolution and variant selection in additively manufactured Ti-6Al-4 V

Study on Wear Resistance of Ti-6Al-4V Alloy Composite Coating Prepared by Laser Alloying

Microstructural Variation and Evaluation of Formability According to High-Temperature Compression Conditions of AMS4928 Alloy

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