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  • 1
    Electronic Resource
    Electronic Resource
    Formability of Al6061 Extruded Tube in Warm Hydroforming (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 599-604 
    Details
    ISSN: 1013-9826
    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: Formability of tube in elevated temperature is essential data to design the warmhydroforming process parameters, such as tube diameter, forming temperature and die geometries.Since the quantitative data of forming limit can be used to predict the failure on forming process,formability data available on the FE analysis is one of the very important information for the optimumdesign. In this study, the effect of heat treatment conditions and deformation temperature on theformability was investigated for the warm hydroforming of Al6061 tube. Full annealing andT6-treatment are applied for the heat treatment of Al6061 tubes. To evaluate the hydroformability,uni-axial tensile test and bulge test were performed at temperature ranges between room temperatureand 300oC. The measured flow stresses were used as input parameters for the simulation of warmhydroforming process. The damage value and strain variation during hydroforming are analysed byFEM. A forming limit based on the ductile fracture criteria has been proposed by combining theresults of experimental and FE analysis for the estimation of formability and optimization of warmhydroforming process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.599.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis on Void Closure Behavior during Hot Open Die Forging (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 69-72 
    Details
    ISSN: 1662-8985
    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: Internal voids have to be eliminated for defect-free in some open die forging. The FEManalysis is performed to investigate the overlap defect of cast ingots during cogging stage. Themeasured flow stress data were used to simulate the cogging process of cast ingot using the practicalmaterial properties. Also the numerical analysis of void closure is performed by using theDEFORMTM-3D. The calculated results of void closure behavior are compared with the measuredresults before and after upsetting, which are scanned by the X-ray scanner. From this result, thecriteria for deformation amounts effect on the void closure were estimated into effective strain of 0.6by the comparison of practical experiment and numerical analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.69.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Accommodation of Grain Boundary Sliding in AZ31 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 581-584 
    Details
    ISSN: 1013-9826
    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: Mg alloys could be the lightest alloys among the industrially applicable engineering alloys.Since wrought Mg alloy has limited applications due to the poor formability, casting is currently themain processing technique to fabricate Mg components even though wrought alloys are superior interms of mechanical properties and reliability. While a lot of research and development has beenfocused on warm forming under the temperature condition of around 250°C where more formabilitycould be expected, superplastic forming could be another way to get over the low formability of Mgalloys. Like other superplastic materials grain boundary sliding is the main deformation mechanism ofMg superplasticity. Accommodation of stress concentration around triple point of grain boundaryshould be done favorably if grain boundary sliding continues without any fracture. In the present study,superplastic behavior of AZ31 alloys with several grain sizes was examined firstly. Accommodationof grain boundary sliding of AZ31 alloy would be discussed on the basis of grain morphology andtexture evolution after tensile deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.581.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Plastic Deformation Behavior of Micro-Alloyed Cold Forging Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 61-64 
    Details
    ISSN: 1662-8985
    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: Micro-alloyed cold forging steel has been developed to rule out heat treatment processbefore forging in order to save energy consumption. These non heat-treated cold forging steelsutilize the work hardening during cold working to ensure the mechanical properties. In other words,the required strength of forged part is achieved by work hardening with the accumulation of plasticstrain during the cold working. Therefore, the plastic deformation characteristics should be carefullyunderstood for successful process design. Evolution of both microstructure and plasticcharacteristics of micro-alloyed cold forging steel has been investigated in the present study. For theoptimization of forging processes, finite element analysis and die life predictions were carried out
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.61.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Warm Forging Characteristics of AZ31 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 437-440 
    Details
    ISSN: 1662-8985
    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: Industrial application of magnesium alloys has increased significantly recently. However,wrought magnesium alloys still have a lot of technical challenges to be solved for more applications.First of all, low formability of wrought alloys should be improved by optimizing the processingvariables. In the present study, the effect of process variables such as forging temperature andforging speed were investigated to forgeability of magnesium alloy. To understand the effect ofprocess variables more specifically, both numerical and experimental works have been carried outon the model which contains upsetting geometry. Forgeability of AZ31 alloy was found to dependmore on the forging speed rather than temperature. Forged sample showed a significant activity oftwinning, which was found to be closely related with flow uniformity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.437.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Warm Hydroformability and Mechanical Properties of Pre- and Post- Heat Treated Al6061 Tubes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 87-90 
    Details
    ISSN: 1662-8985
    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: Warm hydroformability and mechanical properties of pre- and post- heat treated Al6061tubes were investigated in this study. For the investigation, as-extruded, fully annealed and T6-treated Al 6061 seamless tubes were prepared. To evaluate the hydroformability, uni-axial tensiletest and free bulge test were performed at room temperature and 200ÓC. Also mechanical propertiesof hydroformed part at various pre- and post-heat treatments were evaluated by tensile test. Thetensile test specimens were obtained from hexagonal shaped tube hydroformed at 200ÓC formingtemperature. As a result, hydroformability of fully annealed tube is 25% higher than that ofextruded tube. The tensile strength and elongation were more than 330MPa and 12%, respectively,when hydroformed part was T6 treated after warm hydroforming. However, hydroformed part usingT6 pre treated tube represents low elongation, 8%. Therefore, the T6 treatment after hydroformingfor as-extruded tube is proved to be the most cost-effective among various processing conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.87.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Plastic Deformation Characteristics of A356 Alloy with the Variation of Cast Microstructure (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 197-200 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The effect of microstructural features of A356 alloys on plastic deformation behavior wasstudied in the present study. To authors' knowledge, the microstructural effect on mechanicalproperties of A356 alloy has not been well understood even though this alloy system is one of themost widely used alloys for the industrial purpose. Specially, quantitative relationship betweenproperties like ductility and fracture toughness with microstructural features is lacking. In the presentstudy, four different processing methods were used to investigate how the size and distribution ofprimary alpha and eutectic phases influence the plastic deformation characteristics. The prcessingroutes for A356 control arm include low pressure casting, squeeze casting, rheo-casting andcast-forging processes. Special focus was given to understand which microstructural features do thebeneficial or detrimental effect and how they work
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.197.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Thermomechanical Behavior of Al-Mg-Si Alloys at the Elevated Temperature (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 581-584 
    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: Thermomechanical behavior of Al-Mg-Si alloys has been studied to investigate the effect of microstructural features such as pre-existing substructure and distribution of particles on the deformation characteristics. The controlled compression tests have been carried out to get the basic information on how the alloy responds to temperature, strain amount and strain rate. Microstructural features after forging have been discussed in terms of the thermomechanical response of Al-Mg-Si alloys. As already well mentioned, we have found that the high temperature deformation of Al-Mg-Si brought the recovered structure. However, the abnormally large grains seems to occur in a certain condition as a result of deformation assisted grain growth, which means that hot forging of Al-Mg-Si alloys could lead to the undesirable microstructures and the consequent mechanical properties such as fatigue strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.581.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Material Properties on Elastic Characteristics of Cold Forged Part (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 853-856 
    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: The dimension of cold forged part is larger than that of the die cavity. The difference could be originated from the various features, such as the elastic characteristics of die and workpiece, thermal influences, and machine-elasticity. Among these features, elastic behavior of die and workpiece has been considered as the most important element for the precision cold forging. In the present study, the effect of material properties of both workpiece and die on the dimensional precision of forged part was investigated using FE and experimental analyses. Three materials, such as SCM420H, Cu-OFHC and Al6061 alloy, were used to divide the effect of the elastic modulus and flow stress on the dimension specifically. From the results of FEA, the elastic deformation of die was found to be more dominant than that of workpiece. The die expansion depends on the flow stress of workpiece during a loading stage. On the other hand, the die contraction during unloading was affected by both the flow stress and elastic modulus of workpiece. The elastic modulus of workpiece affects the elastic recovery of forged part after ejecting stage
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.853.pdf
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