Tracking microstructure, texture and boundary misorientation evolution of hot deformed and post-deformation annealed Ti–6Al–4V alloy

Lim, Samuel Chao Voon; Yang, Kun; Yang, Yi; Cheng, Yun; Huang, Aijun; Xu, Wu; Davies, Chris

doi:10.1016/j.msea.2015.09.060

Cited by 30 publications

(4 citation statements)

References 29 publications

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“…Or, it may well be a product of the thermomechanical history during production of the base material prior to the EBM welding process. Significant effort is applied during manufacturing to ensure the breakup of these structures in an attempt to avoid deleterious effects on crack initiation and fatigue [35]. As these microstructural features coincide with the residual stress protrusion, it is highly probable that the two findings are interrelated.…”

Section: Discussionmentioning

confidence: 99%

Measurements of residual stress and microstructural evolution in electron beam welded Ti-6Al-4V using multiple techniques

Rae

Lomas

Jackson

et al. 2017

Materials Characterization

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The evolution of residual stress and microstructure has been investigated in electron-beam welded Ti-6Al-4V alloy rings in order to develop an understanding of how the distribution of through-thickness residual stress correlates with microstructural evolution. A multiple technique approach to residual stress measurement was employed using a combination of different measurement techniques including X-ray diffraction (XRD), hole drilling method based on electronic speckle pattern interferometry (ESPI), and the contour method. It was found that there is a strong correlation between the change in residual stress and alpha phase morphology across the weld. The fusion zone exhibited highly tensile residual stress which was typified by an entirely acicular α′ microstructure formed by a displacive transformation within prior β grains on cooling. The tensile residual stress in the centre of the weld reduced towards the heat affected zone, transitioning to a compressive residual stress upon increasing distance from the weld centre. The transition from tensile to compressive residual stress correlates with a significant decrease in the volume fraction of α′ and an increase in the bimodal morphology of equiaxed primary alpha in a diffusional transformed beta matrix leading to elongated alpha in the base material

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Section: Discussionmentioning

confidence: 99%

Measurements of residual stress and microstructural evolution in electron beam welded Ti-6Al-4V using multiple techniques

Rae

Lomas

Jackson

et al. 2017

Materials Characterization

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“…Due to the requirements of the overlap ratio of the laser beam scanning distance and the thickness of the powder bed, the overlap region and the edge of the molten pool are reheated and melted during the preparation of new layers. This process similar to annealing results in recrystallization of LAGBs previously formed and transformation into HAGBs [31]. However, the short remelting time prevents the solidified layer from being completely recrystallized, which is an important reason for the retention of LAGBs [32,33].…”

Section: Phase and Microstructurementioning

confidence: 99%

Unique Duplex Microstructure and Porosity Effect on Mechanical Properties of AlCoCrFeNi2.1 Eutectic High-Entropy Alloys Processed by Selective Laser Melting

Lan

Wang

Cui

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Selective laser melting (SLM) was performed on AlCoCrFeNi 2.1 eutectic high-entropy alloys (EHEAs), and the unique duplex microstructure and porosity were investigated as well as the negative effect on mechanical properties. SLM printed AlCoCrFeNi 2.1 EHEAs is composed of face-centered cubic and BCC/B2 phases, and the surface texture of samples perpendicular to and parallel to the building direction is different. From the bottom of the molten pool to the inside, the structure changes from dendrites to columnar crystals and then to cellular crystals, the distribution of elements in and around the molten pool is uniform, and there is no element segregation. The surface hardness of as-printed AlCoCrFeNi 2.1 EHEAs is higher than that of as-cast ones due to the grain refinement strengthening, and there is anisotropy in different surface hardness, the highest hardness is 580 HV (X-Y plane) and 560 HV (X-Z plane). The reduction of bearing area and tip stress concentration caused by pores have adverse effects on the tensile strength and elongation of the alloy, the ultimate tensile strength increased from 1060 to 1289 MPa.

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“…The globularization of titanium alloy with lamellar colony during hot working can obtain fine and homogeneous microstructure extensively used in aerospace field, which can ensure both optimal creep and optimal fatigue properties [2,3]. The inhomogenous globularization [4] often leads to the formation of microdefects (mixed grains, microstructure heredity and macrozone [5,6]) which seriously affect mechanical properties of aviation components. Therefore, precise control on globularization of titanium alloy with lamellar colony would exert a great significance for optimizing hot-working parameters, predicting and regulating microstructure and improving properties of titanium alloy products.…”

Section: Introductionmentioning

confidence: 99%

“…The thermal mechanical process is very sensitive to hotworking parameters and microstructure parameters, thus resulting in the difficulty in precisely controlling globularization. The detailed characteristics are described as follows: (a) complex and diverse morphologies (initial widmanstatten alpha [4], secondary alpha [28] and fine acicular martensitic alpha [29]) lead to the difference in globularization dynamics; (b) the meso-scale heterogeneous deformation (strain localization at lamellar-scale, strain partitioning behavior at colony-scale, macro-deformation bands at polycrystal-scale [15]); (c) the complex coupling effects of hot-working parameters and microstructure parameters (flow softening due to loss of interfacial coherency [3], evolution of geometry necessary dislocation(GND) at alpha/beta interface [29], the effect of lattice rotation [14,30] on meso-scale heterogeneous deformation). In general, an in-depth understanding of the effects of hot-working parameters and microstructure parameters can allow better control globularization of titanium alloy with lamellar colony.…”

Section: Introductionmentioning

confidence: 99%

Review on globularization of titanium alloy with lamellar colony

Zhang

Zhan

2020

Manufacturing Rev.

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The globularization of titanium alloy with lamellar colony during hot working is an important way to obtain fine and homogeneous microstructure which has excellent mechanical properties. Because of its great technological importance, globularization has captured wide attention and much research. This paper conducts a systematic study on state of art on globularization of titanium alloy, which mainly includes globularization mechanism, prediction model and the effects of hot-working parameters and microstructure parameters. Firstly, the shortcomings of the well-known globularization mechanisms (dynamic recrystallization, boundary splitting, shearing mechanism and termination migration) were summarized. Moreover, the comparison and analysis of prediction models were accomplished through tabular form. In addition, the effects of hot-working parameters (strain, strain rate, temperature) and microstructure parameters (alpha/beta interface, geometry necessary dislocation and high temperature parent beta phase) were systematically summarized and analyzed. Meanwhile, this study also explores those difficulties and challenges faced by precise control on globularization. Finally, an outlook and development tendency of globularization of titanium alloy are also provided, which includes microstructure evolution of three-dimensional lamellar alpha, the relationship between lamellar colony and mechanical properties and the effect of severe plastic deformation on globularization.

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Tracking microstructure, texture and boundary misorientation evolution of hot deformed and post-deformation annealed Ti–6Al–4V alloy

Cited by 30 publications

References 29 publications

Measurements of residual stress and microstructural evolution in electron beam welded Ti-6Al-4V using multiple techniques

Measurements of residual stress and microstructural evolution in electron beam welded Ti-6Al-4V using multiple techniques

Unique Duplex Microstructure and Porosity Effect on Mechanical Properties of AlCoCrFeNi2.1 Eutectic High-Entropy Alloys Processed by Selective Laser Melting

Review on globularization of titanium alloy with lamellar colony

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