The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform

Nikolas W. Hrabe - One of the best experts on this subject based on the ideXlab platform.

  • effects of processing on microstructure and mechanical properties of a titanium alloy ti 6al 4v fabricated using electron beam melting ebm part 2 energy input orientation and location
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Nikolas W. Hrabe, Timothy P. Quinn
    Abstract:

    Abstract Selective electron beam melting (EBM) is a layer-by-layer additive manufacturing technique that shows great promise for fabrication of medical devices and aerospace components. Before its potential can be fully realized, however, a comprehensive understanding of processing-microstructure-properties relationships is necessary. Titanium alloy (Ti–6Al–4V) parts were built in a newly developed, unique geometry to allow accurate investigation of the following intra-build processing parameters: energy input, orientation, and location. Microstructure evaluation (qualitative prior-β grain size, quantitative α lath thickness), tensile testing, and Vickers microhardness were performed for each specimen. For a wide range of energy input (speed factor 30–40), small differences in mechanical properties (2% change in ultimate tensile strength (UTS) and 3% change in yield strength (YS)) were measured. Vertically built parts were found to have no difference in UTS or YS compared to horizontally built parts, but the percent elongation at break (% EL) was 30% lower. The difference in % EL was attributed to a different orientation of the tensile axis for horizontal and vertical parts compared to the elongated prior-β grain and Microstructural Texture direction in EBM Ti–6Al–4V. Orientation within the x – y plane as well as location were found to have less than 3% effect on mechanical properties, and it is possible a second order effect of thermal mass contributed to these results.

  • effects of processing on microstructure and mechanical properties of a titanium alloy ti 6al 4v fabricated using electron beam melting ebm part 2 energy input orientation and location
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Nikolas W. Hrabe, Timothy P Qui
    Abstract:

    Abstract Selective electron beam melting (EBM) is a layer-by-layer additive manufacturing technique that shows great promise for fabrication of medical devices and aerospace components. Before its potential can be fully realized, however, a comprehensive understanding of processing-microstructure-properties relationships is necessary. Titanium alloy (Ti–6Al–4V) parts were built in a newly developed, unique geometry to allow accurate investigation of the following intra-build processing parameters: energy input, orientation, and location. Microstructure evaluation (qualitative prior-β grain size, quantitative α lath thickness), tensile testing, and Vickers microhardness were performed for each specimen. For a wide range of energy input (speed factor 30–40), small differences in mechanical properties (2% change in ultimate tensile strength (UTS) and 3% change in yield strength (YS)) were measured. Vertically built parts were found to have no difference in UTS or YS compared to horizontally built parts, but the percent elongation at break (% EL) was 30% lower. The difference in % EL was attributed to a different orientation of the tensile axis for horizontal and vertical parts compared to the elongated prior-β grain and Microstructural Texture direction in EBM Ti–6Al–4V. Orientation within the x – y plane as well as location were found to have less than 3% effect on mechanical properties, and it is possible a second order effect of thermal mass contributed to these results.

  • Effects of processing on microstructure and mechanical properties of a titanium alloy (Ti–6Al–4V) fabricated using electron beam melting (EBM), Part 2: Energy input, orientation, and location
    Materials Science and Engineering: A, 2013
    Co-Authors: Nikolas W. Hrabe, Timothy P. Quinn
    Abstract:

    Abstract Selective electron beam melting (EBM) is a layer-by-layer additive manufacturing technique that shows great promise for fabrication of medical devices and aerospace components. Before its potential can be fully realized, however, a comprehensive understanding of processing-microstructure-properties relationships is necessary. Titanium alloy (Ti–6Al–4V) parts were built in a newly developed, unique geometry to allow accurate investigation of the following intra-build processing parameters: energy input, orientation, and location. Microstructure evaluation (qualitative prior-β grain size, quantitative α lath thickness), tensile testing, and Vickers microhardness were performed for each specimen. For a wide range of energy input (speed factor 30–40), small differences in mechanical properties (2% change in ultimate tensile strength (UTS) and 3% change in yield strength (YS)) were measured. Vertically built parts were found to have no difference in UTS or YS compared to horizontally built parts, but the percent elongation at break (% EL) was 30% lower. The difference in % EL was attributed to a different orientation of the tensile axis for horizontal and vertical parts compared to the elongated prior-β grain and Microstructural Texture direction in EBM Ti–6Al–4V. Orientation within the x – y plane as well as location were found to have less than 3% effect on mechanical properties, and it is possible a second order effect of thermal mass contributed to these results.

Timothy P. Quinn - One of the best experts on this subject based on the ideXlab platform.

  • effects of processing on microstructure and mechanical properties of a titanium alloy ti 6al 4v fabricated using electron beam melting ebm part 2 energy input orientation and location
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Nikolas W. Hrabe, Timothy P. Quinn
    Abstract:

    Abstract Selective electron beam melting (EBM) is a layer-by-layer additive manufacturing technique that shows great promise for fabrication of medical devices and aerospace components. Before its potential can be fully realized, however, a comprehensive understanding of processing-microstructure-properties relationships is necessary. Titanium alloy (Ti–6Al–4V) parts were built in a newly developed, unique geometry to allow accurate investigation of the following intra-build processing parameters: energy input, orientation, and location. Microstructure evaluation (qualitative prior-β grain size, quantitative α lath thickness), tensile testing, and Vickers microhardness were performed for each specimen. For a wide range of energy input (speed factor 30–40), small differences in mechanical properties (2% change in ultimate tensile strength (UTS) and 3% change in yield strength (YS)) were measured. Vertically built parts were found to have no difference in UTS or YS compared to horizontally built parts, but the percent elongation at break (% EL) was 30% lower. The difference in % EL was attributed to a different orientation of the tensile axis for horizontal and vertical parts compared to the elongated prior-β grain and Microstructural Texture direction in EBM Ti–6Al–4V. Orientation within the x – y plane as well as location were found to have less than 3% effect on mechanical properties, and it is possible a second order effect of thermal mass contributed to these results.

  • Effects of processing on microstructure and mechanical properties of a titanium alloy (Ti–6Al–4V) fabricated using electron beam melting (EBM), Part 2: Energy input, orientation, and location
    Materials Science and Engineering: A, 2013
    Co-Authors: Nikolas W. Hrabe, Timothy P. Quinn
    Abstract:

    Abstract Selective electron beam melting (EBM) is a layer-by-layer additive manufacturing technique that shows great promise for fabrication of medical devices and aerospace components. Before its potential can be fully realized, however, a comprehensive understanding of processing-microstructure-properties relationships is necessary. Titanium alloy (Ti–6Al–4V) parts were built in a newly developed, unique geometry to allow accurate investigation of the following intra-build processing parameters: energy input, orientation, and location. Microstructure evaluation (qualitative prior-β grain size, quantitative α lath thickness), tensile testing, and Vickers microhardness were performed for each specimen. For a wide range of energy input (speed factor 30–40), small differences in mechanical properties (2% change in ultimate tensile strength (UTS) and 3% change in yield strength (YS)) were measured. Vertically built parts were found to have no difference in UTS or YS compared to horizontally built parts, but the percent elongation at break (% EL) was 30% lower. The difference in % EL was attributed to a different orientation of the tensile axis for horizontal and vertical parts compared to the elongated prior-β grain and Microstructural Texture direction in EBM Ti–6Al–4V. Orientation within the x – y plane as well as location were found to have less than 3% effect on mechanical properties, and it is possible a second order effect of thermal mass contributed to these results.

Timothy P Qui - One of the best experts on this subject based on the ideXlab platform.

  • effects of processing on microstructure and mechanical properties of a titanium alloy ti 6al 4v fabricated using electron beam melting ebm part 2 energy input orientation and location
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Nikolas W. Hrabe, Timothy P Qui
    Abstract:

    Abstract Selective electron beam melting (EBM) is a layer-by-layer additive manufacturing technique that shows great promise for fabrication of medical devices and aerospace components. Before its potential can be fully realized, however, a comprehensive understanding of processing-microstructure-properties relationships is necessary. Titanium alloy (Ti–6Al–4V) parts were built in a newly developed, unique geometry to allow accurate investigation of the following intra-build processing parameters: energy input, orientation, and location. Microstructure evaluation (qualitative prior-β grain size, quantitative α lath thickness), tensile testing, and Vickers microhardness were performed for each specimen. For a wide range of energy input (speed factor 30–40), small differences in mechanical properties (2% change in ultimate tensile strength (UTS) and 3% change in yield strength (YS)) were measured. Vertically built parts were found to have no difference in UTS or YS compared to horizontally built parts, but the percent elongation at break (% EL) was 30% lower. The difference in % EL was attributed to a different orientation of the tensile axis for horizontal and vertical parts compared to the elongated prior-β grain and Microstructural Texture direction in EBM Ti–6Al–4V. Orientation within the x – y plane as well as location were found to have less than 3% effect on mechanical properties, and it is possible a second order effect of thermal mass contributed to these results.

Thorsten Hermann Becker - One of the best experts on this subject based on the ideXlab platform.

  • the influence of Microstructural Texture and prior beta grain recrystallisation on the deformation behaviour of laser powder bed fusion produced ti 6al 4v
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2021
    Co-Authors: Gerrit Matthys Ter Haar, Thorsten Hermann Becker
    Abstract:

    Abstract The control and predictability of mechanical properties during manufacturing is essential in achieving parts that consistently deliver adequate mechanical properties. In laser powder bed fusion produced Ti-6Al-4V, this control is complex and dependent on the build orientation. While studies have identified the columnar prior-β grain structure as a cause in mechanical anisotropy, differences in underlying microstructure and its influence on anisotropy are not yet well understood. This study investigates Microstructural Texture differences in two build orientations before and after post-process heat treatments and in what way the Microstructural features control deformation-and-failure behaviour. The study uses uniaxial tensile tests to determine tensile behaviour of samples built “vertically” and “horizontally” with reference to the build plate. Microscopy techniques of scanning electron microscopy imaging and backscatter diffraction are used for microstructure characterisation and deformation mode identification. Results identify key crystallographic and morphological textural differences in the two build-orientations. Heat treatments above the β-transus successfully globularise prior β grains, thereby improving mechanical anisotropy. The use of electron backscatter diffraction demonstrates key morphological features that control slip, microcrack initiation and final fracture.

Fuzeng Wang - One of the best experts on this subject based on the ideXlab platform.

  • FEM-simulation of machining induced surface plastic deformation and Microstructural Texture evolution of Ti-6Al-4V alloy
    International Journal of Mechanical Sciences, 2017
    Co-Authors: Jiming Pang, Jun Zhao, Jian Zang, Fuzeng Wang
    Abstract:

    Abstract When high speed machining polycrystalline metal, severe plastic deformation usually undergoes in the machined surface layer, accompanied by the Microstructural variation of the crystallographic orientation. In the present paper, the machined surface plastic deformation and Microstructural Texture evolution during high speed machining of titanium alloy Ti-6Al-4V were investigated using finite element method (FEM) simulation. Firstly, a two dimensional FEM model was established, and was validated in terms of cutting forces and chip shape characteristics with experimental results of orthogonal machining. The plastic deformation on the machined surface was analyzed on the basis of finite element simulation. Results revealed that the plastic shear strain was much larger than the other strains in different directions. In addition, the variation of plastic shear strain and strain rate versus cutting time was obtained. When the feed rate was constant, the strain decreased and the maximum strain rate increased as cutting speed increased. Finally, the machined surface Texture was simulated and analyzed using the Viscoplastic Self-consistent (VPSC) program based on the variation of plastic shear strain and strain rate, combined with polycrystalline plasticity theory. The machined surface Texture evolution during machining was expressed by pole figures and orientation distribution function (ODF) diagrams. And the cylinder Texture was identified from the pole figures. Four typical shear Textures, including Y, C1, C2, and B fiber Textures, were obtained from the ODF diagrams. Meanwhile, the orientation density of Texture decreased with the increasing of cutting speed.