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  • 1
    Electronic Resource
    Electronic Resource
    Phase Transformations in Pearlitic Steels Induced by Severe Plastic Deformation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 114 (July 2006), p. 133-144 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The paper presents an overview of a number of unusual phase transformations which takeplace in pearlitic steels in conditions of the severe deformation, i.e. combination of high pressureand strong shear strain. Strain-induced cementite dissolution is a well-documented phenomenon,which occurs during cold plastic deformation of pearlitic steels. Recently new results which canshed additional light on the mechanisms of this process were obtained thanks to 3DAP and HRTEMinvestigations of pearlitic steel deformed by high pressure torsion (HPT). It was shown that theprocess of cementite decomposition starts by carbon depletion from the carbides, which indicatesthat the deviation of cementite’s chemical composition from the stoichiometric is the main reasonfor thermodynamic destabilisation of cementite during plastic deformation. Important results wereobtained regarding the distribution of released carbon atoms in ferrite. It was experimentallyconfirmed that carbon segregates to the dislocations and grain boundaries of nanocrystalline ferrite.Another unusual phase transformation taking place in nanocrystalline pearlitic steel during roomtemperature HPT is a stress induced α→γ transformation, which never occurs during conventionaldeformation of coarse grained iron and carbon steels. It was concluded that this occurred due to areverse martensitic transformation. The atomistic mechanism and the thermodynamics of thetransformation, as well as issues related to the stability of the reverted austenite will be discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.114.133.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cementite Decomposition of Pearlitic Steels during Cold Drawing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 45-50 
    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: Microstructures of cold drawn pearlitic steel wires were investigated by three-dimensional atomprobe (3D-AP) to understand the influence of alloying elements on the decomposition of cementite.Before cold drawing, Si is mostly located in the ferrite phase, while Cr is located in the Fe3C phaseand the amount of Mn is similar in Fe3C and in ferrite. Higher Si amount leads to higher dissolutionrate of cementite and Cr has a little effect on cementite decomposition during drawing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.45.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    3D-Atom Probe Investigation of Vacancy Induced Interdiffusion during High Pressure Torsion Deformation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 433-438 
    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: Concentration gradients resulting from long range diffusion during Severe Plastic Deformation (SPD) have been investigated with the 3D Atom Probe technique (3D-AP). First, in a pearlitic steel where alloying elements (Mn, Si and Cr) are partitioned between the ferrite and carbides in the non-deformed state. After processing by High Pressure Torsion (HPT), they are homogeneously distributed in the nanostructure, indicating that long range diffusion occurred along with the dissolution of carbides. 3D-AP data of a Cu-Fe composite processed by HPT show as well a significant interdiffusion of Cu and Fe, probably promoted by additional vacancies. On the basis of these experimental data, and using the theory described for irradiated materials, vacancy fluxes and vacancy production rates were estimated assuming that new vacancies are continuously produced and eliminated on grain boundaries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.503-504.433.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure of a Metal-Polymer Composite Processed by Severe Plastic Deformation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 306-309 
    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: Here we report about the microstructure of a metal-polymer composite that was processedby severe plastic deformation. The composite was prepared by compaction of a sandwich made ofAl foils and polyethylene films. This aluminum-polyethylene composite was processed by highpressure torsion and the microstructure was characterized by optical microscopy and scanningelectron microscopy. Our experimental data clearly show that in the early stage, the deformation isnot homogeneous within the sample, indicating that significant softening occurred. However, atlarger number of revolution the deformation progressively reaches the sample centre and the finalmaterial exhibits an ultrafine grained composite structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.306.pdf
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    Paper (German National Licenses)
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