Thermophysical properties of solid phase Ti-6Al-4V alloy over a wide temperature range

Milošević, Nenad; Aleksić, Ivana

doi:10.3139/146.110678

Cited by 34 publications

(17 citation statements)

References 11 publications

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“…Initial temperatures are taken from high-speed camera imaging thermal data. Published thermophysical data is used for Ti-6Al-4V 37 – 39 , Cu 40 and Ar 41 .…”

Section: Methodsmentioning

confidence: 99%

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

Kenel

Grolimund

et al. 2017

Sci Rep

120

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We present combined in situ X-ray diffraction and high-speed imaging to monitor the phase evolution upon cyclic rapid laser heating and cooling mimicking the direct energy deposition of Ti-6Al-4V in real time. Additive manufacturing of the industrially relevant alloy Ti-6Al-4V is known to create a multitude of phases and microstructures depending on processing technology and parameters. Current setups are limited by an averaged measurement through the solid and liquid parts. In this work the combination of a micro-focused intense X-ray beam, a fast detector and unidirectional cooling provide the spatial and temporal resolution to separate contributions from solid and liquid phases in limited volumes. Upon rapid heating and cooling, the β ↔ α′ phase transformation is observed repeatedly. At room temperature, single phase α′ is observed. Secondary β-formation upon formation of α′ is attributed to V partitioning to the β-phase leading to temporary stabilization. Lattice strains in the α′-phase are found to be sensitive to the α′ → β phase transformation. Based on lattice strain of the β-phase, the martensite start temperature is estimated at 923 K in these experiments. Off-axis high speed imaging confirms a technically relevant solidification front velocity and cooling rate of 10.3 mm/s and 4500 K/s, respectively.

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“…Initial temperatures are taken from high-speed camera imaging thermal data. Published thermophysical data is used for Ti-6Al-4V 37 – 39 , Cu 40 and Ar 41 .…”

Section: Methodsmentioning

confidence: 99%

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

Kenel

Grolimund

et al. 2017

Sci Rep

120

View full text Add to dashboard Cite

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“…16 give a value between 0.56 and 0.6 at a wavelength of 684.5 nm. Milošević and Aleksić 17 give value of-0.53-0.71 in the temperature range from 1300 K to 1750 K at 900 nm. Coppa and Consorti 18 found a value of 0.77 at 1218 K for radiation integrated in the range 0.8 µm-1.1 µm.…”

Section: Assumptions On Emissivity In Vis-nirmentioning

confidence: 97%

Development of a dual infrared and visible near-infrared measurement system for the observation of adiabatic shear bands

Pawelko

Pina

Hervé

2019

Review of Scientific Instruments

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This paper presents the development of a new system designed to measure the local temperature field in adiabatic shear band. Transient temperature field are simultaneously recorded by an array of 32 InSb infrared (IR) detectors and a streak camera working in visible-near infrared (VIS-NIR). Observations in IR offer a low temperature detection limit (350 • C) but they are highly sensitive to uncertainty in the emissivity. Observations in VIS-NIR allow for measurement only at high temperatures (>750 • C) but they are less affected by uncertainty on emissivity and present a higher temperature sensitivity. By performing simultaneous measurements, it is possible to obtain data on a large temperature range with an improved accuracy at high temperature. The different sources of errors caused by uncertainty in the emissivity, spatial and temporal resolution of the detectors has been analyzed and an estimation of the total measurement uncertainty of the system is given.a) The following article has been submitted to Review of Scientific Instruments. After it is published, it will be found at Link.

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“…The temperature-dependent material properties of Ti6Al4V are illustrated in Figure 7A,B, including the bulk modulus, 74 shear modulus, 74 viscosity, 75 and heat capacity. 76 The experimental data of thermal conductivity can be found in literature. 76 A Gaussian distributed laser heat flux moving along the centerline of the powder bed is applied on the surface of the powder bed.…”

Section: Validation Of the Pbf Am Processmentioning

confidence: 99%

“…76 The experimental data of thermal conductivity can be found in literature. 76 A Gaussian distributed laser heat flux moving along the centerline of the powder bed is applied on the surface of the powder bed. Combinations of the laser moving speeds and laser powers in the experiments of Dilip et al 47 are studied by the HOTM numerical simulations.…”

Section: Validation Of the Pbf Am Processmentioning

confidence: 99%

“…The discretization of the powder bed geometry shown in Figure 2B shows the discretization of the powder bed and the substrate with 324,963 material points and 326,348 degrees of freedom. The temperature‐dependent material properties of Ti6Al4V are illustrated in Figure 7A,B, including the bulk modulus, 74 shear modulus, 74 viscosity, 75 and heat capacity 76 . The experimental data of thermal conductivity can be found in literature 76 …”

Section: Validationmentioning

confidence: 99%

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A Lagrangian meshfree mesoscale simulation of powder bed fusion additive manufacturing of metals

Fan

Wang

Huang

et al. 2020

Numerical Meth Engineering

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We present a powder-scale computational framework to predict the microstructure evolution of metals in powder bed fusion additive manufacturing (PBF AM) processes based on the hot optimal transportation meshfree (HOTM) method. The powder bed is modeled as discrete and deformable three-dimensional bodies by integrating statistic information from experiments, including particle size and shape, and powder packing density. Tractions in Lagrangian framework are developed to model the recoil pressure and surface tension. The laser beam is applied to surfaces of particles and substrate dynamically as a heat flux with user-specified beam size, power, scanning speed, and path. The linear momentum and energy conservation equations are formulated in the Lagrangian configuration and solved simultaneously in a monolithic way by the HOTM method to predict the deformation, temperature, contact mechanisms, and fluid-structure interactions in the powder bed. The numerical results are validated against single track experiments. Various powder bed configurations, laser powers, and speed are investigated to understand the influence of dynamic contact and inelastic material behavior on the deformation, heat transfer, and phase transition of the powder bed. The formation of defects in the microstructure of 3D printed metals, including pores, partially, and unmelted particles, is predicted by the proposed computational scheme.

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Thermophysical properties of solid phase Ti-6Al-4V alloy over a wide temperature range

Cited by 34 publications

References 11 publications

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

Development of a dual infrared and visible near-infrared measurement system for the observation of adiabatic shear bands

A Lagrangian meshfree mesoscale simulation of powder bed fusion additive manufacturing of metals

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