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Jacqueline Lecomtebeckers - One of the best experts on this subject based on the ideXlab platform.

  • conception of tooling adapted to thixoforging of high solid fraction Hot Crack sensitive aluminium alloys
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomtebeckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<ϕs<1), which involves the processing of alloys in the semi-solid state. Tooling has to be adapted to this particular process to benefit shear thinning and thixotropic behaviour of such semi-solid material. Tooling parameters, such as the forming speed and tool temperature, have to be accurately controlled because of their influence on thermal exchanges between material flow and tool. These thermal exchanges influence the high-Cracking tendency and the rheology of the semi-solid material during forming, which affects parts properties and therefore their quality. Extrusion tests show how thermal exchanges influence quality of thixoforged parts made of 7075 aluminium alloys at high solid fraction by modifying process parameters like forming speed, tool temperature and tool thermal protector. Thus an optimum in terms of thermal exchanges has to be found between surface quality and mechanical properties of the part. A direct application is the evaluation of surface quality of thixoforged thin wall parts made of 7075 aluminium alloy.

  • benefits of thixoforging Hot Crack sensitive aluminium alloys at high solid fraction
    International Journal of Material Forming, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomtebeckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7Hot Cracking for some Hot Crack-sensitive wrought aluminium alloys. Hot Cracking occurs because of strain and deformation during last step of solidification. This paper shows how thixoforging process should help to lower Hot Cracking tendency without modification of the alloy composition by decreasing strain and deformation due to shrinkage. Different experimental tests by extrusion of 7075 aluminium alloys are used.

Grégory Vaneetveld - One of the best experts on this subject based on the ideXlab platform.

  • conception of tooling adapted to thixoforging of high solid fraction Hot Crack sensitive aluminium alloys
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomtebeckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<ϕs<1), which involves the processing of alloys in the semi-solid state. Tooling has to be adapted to this particular process to benefit shear thinning and thixotropic behaviour of such semi-solid material. Tooling parameters, such as the forming speed and tool temperature, have to be accurately controlled because of their influence on thermal exchanges between material flow and tool. These thermal exchanges influence the high-Cracking tendency and the rheology of the semi-solid material during forming, which affects parts properties and therefore their quality. Extrusion tests show how thermal exchanges influence quality of thixoforged parts made of 7075 aluminium alloys at high solid fraction by modifying process parameters like forming speed, tool temperature and tool thermal protector. Thus an optimum in terms of thermal exchanges has to be found between surface quality and mechanical properties of the part. A direct application is the evaluation of surface quality of thixoforged thin wall parts made of 7075 aluminium alloy.

  • Benefits of thixoforging Hot-Crack-sensitive aluminium alloys at high solid fraction
    International Journal of Material Forming, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomte-beckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7

  • benefits of thixoforging Hot Crack sensitive aluminium alloys at high solid fraction
    International Journal of Material Forming, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomtebeckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7Hot Cracking for some Hot Crack-sensitive wrought aluminium alloys. Hot Cracking occurs because of strain and deformation during last step of solidification. This paper shows how thixoforging process should help to lower Hot Cracking tendency without modification of the alloy composition by decreasing strain and deformation due to shrinkage. Different experimental tests by extrusion of 7075 aluminium alloys are used.

Kojui Chuang - One of the best experts on this subject based on the ideXlab platform.

  • application of iron based powders in tungsten inert gas welding for 17cr 10ni 2mo alloys
    Powder Technology, 2012
    Co-Authors: Kuanghung Tseng, Kojui Chuang
    Abstract:

    Abstract This study investigates the influences of specific flux powders, including FeF2, FeO, and FeS on the surface appearance, geometric shape, angular distortion, Hot Crack susceptibility, and metallurgical properties of 5-mm-thick 17Cr–10Ni–2Mo alloys welded using the tungsten inert gas (TIG) process. Results indicate that TIG welding with FeF2 powder produces a weld of satisfactory appearance. TIG welding with FeO and FeS powders results in a substantial increase in both the joint penetration and weld aspect ratio, thereby reducing angular distortion of the weldment. TIG welding with FeO and FeS powders increases the delta-ferrite content and decreases welding heat input, and tends to reduce Hot Crack susceptibility of the welds. This study demonstrates that the application of activated powder assisted TIG welding can improve the weldment performances.

Anthony P Reynolds - One of the best experts on this subject based on the ideXlab platform.

  • production of wire via friction extrusion of aluminum alloy machining chips
    Journal of Materials Processing Technology, 2010
    Co-Authors: W Tang, Anthony P Reynolds
    Abstract:

    This paper describes the production of fully consolidated wires from aluminum alloy AA2050 and aluminum alloy AA2195 machining chips via the friction extrusion process. In this work, the extrusion rate was linearly related to the power input/die rotational speed. Hot Crack and cold Crack defects appeared on wires produced using either too high or too low a power input/die rotational speed. The extruded wire microstructure consisted of fully equiaxed, recrystallized grains. Average grain size in the wires generally increases with the increase of die rotational speed/extrusion power. Micro-hardness was homogeneous across the wire transverse cross-sections. Positive response to post-extrusion heat treatment was observed with increasing extrusion power indicating increasing temperature and in process solution heat treatment of the wire with sufficient extrusion power. The ductility of defect free wire was demonstrated by the absence of Cracking in 5T bend tests.

Ahmed Rassili - One of the best experts on this subject based on the ideXlab platform.

  • conception of tooling adapted to thixoforging of high solid fraction Hot Crack sensitive aluminium alloys
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomtebeckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<ϕs<1), which involves the processing of alloys in the semi-solid state. Tooling has to be adapted to this particular process to benefit shear thinning and thixotropic behaviour of such semi-solid material. Tooling parameters, such as the forming speed and tool temperature, have to be accurately controlled because of their influence on thermal exchanges between material flow and tool. These thermal exchanges influence the high-Cracking tendency and the rheology of the semi-solid material during forming, which affects parts properties and therefore their quality. Extrusion tests show how thermal exchanges influence quality of thixoforged parts made of 7075 aluminium alloys at high solid fraction by modifying process parameters like forming speed, tool temperature and tool thermal protector. Thus an optimum in terms of thermal exchanges has to be found between surface quality and mechanical properties of the part. A direct application is the evaluation of surface quality of thixoforged thin wall parts made of 7075 aluminium alloy.

  • Benefits of thixoforging Hot-Crack-sensitive aluminium alloys at high solid fraction
    International Journal of Material Forming, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomte-beckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7

  • benefits of thixoforging Hot Crack sensitive aluminium alloys at high solid fraction
    International Journal of Material Forming, 2010
    Co-Authors: Grégory Vaneetveld, Ahmed Rassili, Jean-christophe Pierret, Jacqueline Lecomtebeckers
    Abstract:

    Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7Hot Cracking for some Hot Crack-sensitive wrought aluminium alloys. Hot Cracking occurs because of strain and deformation during last step of solidification. This paper shows how thixoforging process should help to lower Hot Cracking tendency without modification of the alloy composition by decreasing strain and deformation due to shrinkage. Different experimental tests by extrusion of 7075 aluminium alloys are used.