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  • Electronic Resource  (5)
  • 2005-2009  (5)
  • 2008  (5)
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  • Electronic Resource  (5)
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  • 2005-2009  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Study on Microstructure-Processing Relationship of a Semisolid Rheocasting A357 Aluminum Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 157-162 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: An improved and self-developed semisolid preparing and rheomoulding device —rotating barrel rheomoulding machine (RBRM) for light alloys in laboratory is introduced in thispaper. It mainly consists of a melting furnace, a shearing system with two relative-rotating conicalbarrels, a central temperature control unit, gas protection system and a die-casting system.Microstructure-processing relationship of A357 aluminum alloy obtained by the RBRM process isinvestigated by different intensity of turbulence and different shear rate. The experimental resultsshow that the improved RBRM is capable of eliminating coarse dendrites, and producing small andspherical solid particles uniformly distributed in a eutectic matrix. In addition, the process caneliminate entrapped gas and reduce fine shrinkage pores in the specimens as well. Compared withthe original self-developed device in our laboratory, the improved equipment has the followingadvantages: accurate control of stirring temperature; small volume and convenient manipulation;fine and spherical solid particles, chemical and microstructural uniformity throughout the specimensand so on
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.157.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of Semi-Solid Slurry for Steels and Their Rheo-Rolling Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 457-461 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Semi-solid metal forming (SSM) has been recognized as a new forming technology, whichis different from the present metal forming methods. Basic research on SSM has been put intooperation and a number of SSM techniques have been widely applied in industry. In the application ofSSM technique, at present, it is mainly used to produce the low melting point alloys such as Al-base,Zn-base and Mg-base alloys, but the high melting point alloys, for example steels as the most widelyuseful metal are not extensively studied and applied. In the present work, the electromagnetic stirringmethod was used to prepare semi-solid slurry of spring steel–60Si2Mn and stainlesssteel–1Cr18Ni9Ti. At the same time, spring steel–60Si2Mn and stainless steel–1Cr18Ni9Ti weredirectly rolled into thick strips in the semi-solid state (Rheo-rolling). It is aimed at studying themicrostructure and properties of the strips to establish the feasibility of rheo-rolling for the productionof the steel strips. According to the present research work, it has been shown that rheo-rolling processcombines the casting and hot rolling into a single step for near net-shape production, compared withthe conventional hot-rolled metallurgical process. Besides being such a cost-effective process,rheo-rolling process possesses irregular crystal grains such as rosette-type primary crystals in themicrostructures because of sufficient agitation during solidification. The overall homogenization ofthe macrostructures in the whole part of steel ingot can be achieved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.457.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation of Intercritical Austenization of a C-Mn Cold Rolled Dual Phase Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1062-1069 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Formation of austenite strongly influences the microstructures and mechanical propertiesof dual phase steels. In present work, austenization process during intercritical annealing was studiedin a Fe-C-Mn steel using Gleeble-1500 thermal simulator and quantitative microscopy. Theexperimental results show that austenite formation is separated into three different stages: (i) growthof high carbon austenite into pearlite rapidly until pearlite dissolution is completed; (ii) slowergrowth of austenite into ferrite; (iii) very slow equilibration between ferrite and austenite. Thethermodynamic and kinetic analyses show that growth of austenite into ferrite is controlled by carbondiffusion in austenite in the primary stage and manganese diffusion in ferrite in the subsequent stagebecause diffusion coefficient of Mn in ferrite is several orders of magnitude smaller than that of C inaustenite. The slow final equilibration between ferrite and austenite is obtained by manganesediffusion through the austenite. Based on the analysis, one dimensional diffusion model ofintercritical austenization was developed and solved using finite volume method on the assumptionthat solute flux was local balance at interface, and the kinetics calculated was compared withexperimental results. Simulated results indicate that growth of austenite reaches paraequilibrium inabout one second, but remains thousands of seconds to reach final equilibrium. Simulatedconcentration profiles show that manganese atoms transferred from ferrite congregate in austenitenear phase interface, which is consistent with the experimental phenomenon
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1062.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    3D Thermal Mechanical Coupled Elasto-Plastic Finite Element Analysis in the Whole Rolling Process of H-Beam (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 532-538 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the H-beam rolling process, the deformations and temperature field of workpiecesignificantly influence the mechanical properties due to the change of product microstructure.Prediction of them is important for the groove design and passes sequences. To get the deformationbehavior and the temperature field of workpiece, commercial FEM program LS-DYNA has beenused to analyze the whole process of H-beam rolling. The approach is based on 3D thermalmechanical coupled finite element method. The rolling process is divided into several units forcalculation. The mesh of workpiece is rebuilt in the simulation for reducing the influence of elementdistortion. The result shows that, the temperature at the wed to flange position maintains the highestduring the whole rolling process, while area of the web the lowest. After the rolling, temperaturedifference is above 150K between the web’s surface and flange’s inside surface, approximate 130Kon the flange’s outside surface and 200K in the cross section. The simulation results show goodagreement with the measured temperature data
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.532.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Research on the Accurate Control of Initial and Finishing Cooling Temperatures for X70 Pipeline Steels (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1038-1043 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Different cooling parameters, including the initial cooling temperature, finishing coolingtemperature and cooling rate, have a significant effect on the final microstructures and properties forpipeline steels. In present work, Gleeble-1500 thermal-mechanical simulator was used to investigatethe microstructural evolution of X70 pipeline steels under different cooling conditions, and themicrostructures obtained were analyzed using optical microscope and transmission electronmicroscope. The experimental results showed that when the initial and finishing cooling temperaturesare controlled in the range of 740~760°C and 500~520°C respectively, the microstructure of X70pipeline steels reveals a proper content (about 12%) of pre-eutectoid ferrite besides acicular ferriteand M/A (Martensite/Austenite) island, which can guarantee an optimum combination of strength andductility. In contrast to the conventional way using CCT curve, this methodology shows a higheraccuracy and operability, and used in industrial production to achieve good effect
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1038.pdf
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    Paper (German National Licenses)
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