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  • 1
    Digitale Medien
    Digitale Medien
    Diode Laser Modification of Surface Gradient Layer Properties of a Hot-Work Tool Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 657-660 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The objective of the present work was to study the modification of the microstructure ofhot-work tool steels X40CrMoV5-1 and X38CrMoV5-3 during the surface modifying by means oflaser technology. This treatment aims to harden and alloy the steel surface which had been previouslycoated with tungsten carbide (WC) and were introduced using the rotor conveyer to improve theproperties of the surface layer. The fine grained, dendritic structure occurs in the remelted and alloyedzone with the crystallization direction connected with the dynamical heat abstraction from the laserbeam influenced zone. The fine grained martensite structure is responsible for the hardness increaseof the alloyed layer
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.657.pdf
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Structure and Properties of Gradient Layers Using High Power Diode Laser (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 269-274 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Investigations include alloying the X38CrMoV5-3 hot-work tool steel surfacelayer with the tungsten carbide, using the high power diode laser (HPDL). The tungstencarbide ceramic particles of the medium grain size according to FSSS = 50 Bm wereintroduced using the rotor conveyer to improve the properties of the surface layer. Thepowder feed rate was set at the steady level of 8.64g/min. Remelting and alloying werecarried out several times in the laser power range of 1.2 – 2.3 kW in the remelting/alloying,alloying/remelting sequences. The structural mechanism was determined of gradient layerdevelopment, effect was studied of alloying parameters, gas protection method, and powderfeed rate on its mechanical properties, and especially on its hardness, abrasive wearresistance, and roughness. Structure changes were revealed consisting, in particular, in itsrefining, and also hardness and microhardness changes in comparison to the non-remeltedsteel. Examination results obtained with the EDX microanalysis, surface and linear analysesof the chemical composition, as well as the X-ray qualitative phase analysis are presented
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.269.pdf
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Structure and Properties of the 32CrMoV12-28 Steel Alloyed with WC Powder Using HPDL Laser (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 334-339 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: This paper presents the investigation results of laser alloying and the influence onstructure and properties of the surface of the 32CrMoV12-28 hot work steel, carried outusing the high power diode laser (HPDL). Structure changes were determined in the work,especially structure fragmentation. Also hardness investigation of the different remeltingareas was performed. The reason of this work was also to determine the laser treatmentparameters, particularly the laser power, to achieve good work stability and to make the toolsurface more resistant for work extremal conditions. Based on microstructural examinationsof the obtained material, the distribution of the reinforcing ceramic particles in the hot worktool steel was revealed. Tungsten carbide WC powder was used for alloying. The remeltedlayers which were formed on the surface of the investigated hot work steel were examinedmetallographically and analyzed using a hardness testing machine
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.334.pdf
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Laser Alloying with WC Ceramic Powder in Hot Work Tool Steel Using a High Power Diode Laser (HPDL) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 193-198 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Investigations include alloying the X38CrMoV5-3 hot-work tool steel surface layer withthe tungsten carbide, using the high power diode laser (HPDL). The tungsten carbide ceramicparticles of the medium grain size according to FSSS = 50 /m were introduced using the rotorconveyer to improve the properties of the surface layer. The powder feed rate was set at the steadylevel of 8.64g/min. Remelting and alloying were carried out several times in the laser power rangeof 1.2 – 2.3 kW in the remelting/alloying, alloying/remelting sequences. The structural mechanismwas determined of gradient layer development, effect was studied of alloying parameters, gasprotection method, and powder feed rate on its mechanical properties, and especially on itshardness, abrasive wear resistance, and roughness. Structure changes were revealed consisting, inparticular, in its refining, and also hardness and microhardness changes in comparizon to the nonremeltedsteel. Examination results obtained with the EDX microanalysis, surface and linearanalysis of the chemical composition, as well as the X-ray qualitative phase analysis are presented
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.193.pdf
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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