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  • 1
    Electronic Resource
    Electronic Resource
    Process Window Determination for Thixoextrusion ProcessesUsing a Steel Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 61-66 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A direct semi-solid bar extrusion process is characterised by inserting a feed stock in acontainer and extruding through a forming die with a punch. Compared to conventional barextrusion the use of semi-solid material complicates the process due to the requirement ofsolidification of the material. To achieve the solidification of the semi-solid bar, different basic toolconcepts are presented. With a combination of these concepts experiments were carried out usingthe steel alloy X210CrW12 to detect the influence of the most influencing parameters pressvelocity, extrusion channel diameter, length and geometry. Numerical simulations enable a betterunderstanding of the process mechanics like temperature development in the billet and forming dieas well as the material flow in the deformation zone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.61.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Investigations on Thermal Influencesfor Thixoforging and Thixojoining of Steel Components (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 37-42 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: At the Institute of Metal Forming (IBF) current investigations within the framework ofthe Collaborative Research Centre 289 are mainly concentrated on forming of semi-solid precursormaterial of the steel grades X210CrW12 and 100Cr6. One important task is the precise temperaturefor the composition of solid and liquid phase fraction in the preheated billet. Experimentalmeasurements and numerical simulations show significant heat losses during transport of the billetand after its insertion into the die. These developing temperature gradients influence strongly theresulting temperature field in the formed component. In case of the forming tools the criticalincrease of the temperature depending on the tool material is shown. As fundamental research in thefield of thixojoining the temperature development of the inserts is analysed and demonstrates thefeasibility of joining higher and lower melting materials into the semi-solid matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.37.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of Flow Behaviour and Microstructure on X210CrW12 Steel in Semi-Solid State (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 189-192 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: This paper describes the basic investigation on material behaviour of cold working steelX210CrW12 in semi-solid state concerning the semi-solid forging. It includes a study of flowbehaviour and microstructure by means of a high temperature isothermal upsetting test applying aspecial cylinder sample with a shell, which is designed to avoid collapsing of samples during thecompression. The flow curve of the semi-solid steel is determined by an inverse modelling via FEMusing the obtained load curve of the samples and the separately obtained flow stress of the shellmaterial. An extensive microstructure study of the compressed samples provides a comprehensiveunderstanding on the flow mechanism of the semi-solid steel. At the end of the paper some generalrestrictions and remarks for the semi-solid forging process are given based on the gained results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.189.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Automated Semi-Solid Forging of Steel Components by Means of Thixojoining (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 383-386 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The thixoforming processes join the advantages of conventional forming technologies asforging and casting in respect of the mechanical properties and the practicable geometries. Within theframework of the Collaborative Research Centre 289 at the RWTH Aachen University intensiveinvestigations on semi-solid processing with some steel grades have been running. For this purpose anautomated thixoforging plant (thixo-cell) has been developed in a closed cooperation with severalindustrial partners. With this equipment multi material demonstrator components have beensuccessfully produced by thixojoining using semi-solid X210CrW12 tool steel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.383.pdf
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    Paper (German National Licenses)
    Fulltext
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