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  • 1
    Electronic Resource
    Electronic Resource
    Semi-Solid Extrusion of Complex-Shaped Steel Rods Using Ceramic Dies (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 243-248 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Isothermal semi-solid extrusion experiments using steel grade X210CrW12 as work materialwere performed on an industrial forging machine. An improved and up-scaled tool design wasapplied, based on the concept of self-heating ceramic dies tested in previous laboratory-scale studiesand allowing for die preheating temperatures of up to 1400°C.Steel rods of complex cross sectional geometry were formed at low extrusion forces. Shape accuracyof as-formed rods is accurate and metallurgical examination yields no evidence of liquid phaseseparation. With a view on the intended industrial implementation construction of ceramic tools hasto be improved in order to avoid rupture of ceramic parts due to thermo-mechanically induced stressesand to benefit from the advantages inherent to ceramics in metal forming
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.243.pdf
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    Paper (German National Licenses)
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Rheoforging of Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 464-467 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Rheoforging is a modification of semi-solid forging starting directly from the liquid phaseinstead of reheating of a billet. In this process semi-solid slurry is prepared by pouring slightlyoverheated melt over a slope into a holding cup to induce homogenous nucleation. By controlling thecasting temperature and holding time in the cup the desired semi-solid slurry with fine, globularmicrostructure is successfully created. The inline forging trials using this slurry show the principalfeasibility of the process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.464.pdf
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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