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  • Articles: DFG German National Licenses  (9)
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  • Articles: DFG German National Licenses  (9)
Material
Years
  • 1
    Electronic Resource
    Electronic Resource
    Role of Amorphous Silicon Carbide in Microstructure and Mechanical Properties of nc-TiC/a-SiC Nanocomposite Coatings Prepared by PECVD (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2271-2274 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2271.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    TLP Bonding of DS Ni Base Superalloy, GTD-111 Using Mixed Powder of Base Metal and Filler Metal (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 894-899 
    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: The effect of a mixed powder on the wide gap transient liquid phase diffusion bonding ofa directionally solidified Ni base superalloy, GTD-111 was investigated. The mixed powderconsisted of a mixture of a powdered Ni base filler (GNi-3) and powdered base metal (GTD-111).The range of the base metal powder was 40 to 70wt%. Bonding was performed at a temperature of1463K, using various holding time. In the case of a lower 50wt%, the base metal powderscompletely melted and base metal mating at the interface dissolved at an early time, and extent ofdissolution of base metal decreased with increasing mixing ratio. Liquid was eliminated byisothermal solidification, which was controlled by the diffusion of B into the base metal. The solidsin the bonded interlayer grew epitaxially from the mating base metal inward from the insert metaland the number of grain boundaries formed at the bonded interlayer corresponded with those of thebase metal. The finishing time for isothermal solidification was about 74ks. In the case 60wt% andhigher, the base metal powders partially melted and remained in the vicinity of bonded interlayer.The solid was formed from the remaining powder and base metal mating at the interface. Finally,the bonded interlayer underwent the poly-crystallization when isothermal solidification wascomplete. The contents of Al and Ti in the bonded interlayer with a holding of 74ks were equal tothat of the base metal
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.894.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Characteristics of Nd:YAG Laser Welded 600MPa Grade TRIP and DP Steels (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3967-3972 
    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 characteristics of Nd:YAG laser welded 600MPa grade TRIP(transformation inducedplasticity) and DP(dual phase) steels with respect to hardness, microstructures, mechanicalproperties and formability was investigated. A shielding gas was not used, and bead-on-platewelding was performed using various welding speeds at a power of 3.5kW.In the case of TRIP steel, the hardness was the highest at the fusion zone(FZ) and HAZ near the FZand decreased as the base metal was approached. The maximum hardness increased with increasingwelding speed to 3.6m/min and then remained. The microstructures of FZ and HAZ near the FZconsisted of ferrite and bainite for all welding speeds.In the case of DP steel, the maximum hardness was obtained at the HAZ near the FZ. It increasedrapidly to 2.1m/min and then showed nearly the same value. The difference between the maximumhardness of HAZ and that of FZ increased with decreasing welding speed. The microstructure of FZwas composed of acicular ferrite but the HAZ near the FZ contained bainite and ferrite at a lowwelding speed.Both steels had similar tensile properties and formabilities. In a perpendicular tensile test to theweld line, all specimens were fractured at the base metal, and the strengths were somewhat higherthan those of raw metals. In a parallel tensile test, the strengths of the joints were higher than thoseof raw materials but the elongations were lower. Formability was determined to be approximately80% as compared with raw material at the optimum conditions.Differences in hardness near the welded zone was dependant on the relative contents of ferrite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3967.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Modified Solution Heat Treatment on δ- Phase and Low Cycle Fatigue Properties of Inconel 718 Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 71-76 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Effects of solution treatment on the microstructure and mechanical properties in wroughtAlloy 718 were investigated. For the improvement of tensile and fatigue properties of wroughtAlloy 718, a modified solution heat treatment(MSHT), heating at 1000[removed info] for 3 minutes followed byfurnace cooling at the rate of 3[removed info]/minute and holding at 985[removed info] for 8 minutes, was proposed. Thistreatment was performed repeatedly 3 times and the samples were subject to the standard agingtreatment. For the purpose of comparison, a standard heat treatment(SHT) was also performed. Themicrostructures of modified solution heat treated specimens showed that small spherical shaped δ-phases were precipitated without grain growth, and the amount of δ-phases was smaller than that ofstandard heat treated specimens. However, the δ-phases of the standard heat-treated specimenshowed needle-like morphologies. Tensile and low cycle fatigue tests were performed on bothmodified heat-treated and standard heat-treated specimens at room temperature, 350[removed info] and 650[removed info].Low cycle fatigue tests on the modified heat treated specimens showed promising results withoutreduction of strength. However, the tensile properties of modified solution treated specimens wasalmost the same as those of standard heat treated materials both at room temperature and 650[removed info]
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.71.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Change of Microstructures of Directionally Solidified Ni Base Superalloy GTD-111 at High Temperature (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 65-70 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In the case of transient liquid phase diffusion bonding with Ni base superalloy GTD-111,the bonding temperature was sustained at 1403K ~ 1453K. Thus, the microstructure of specimensheated at 1403K ~ 1453K was examined. In the raw material, γ-γ' eutectic phases, platelet η phases,MC carbide and PFZ were clearly observed in interdendritic regions or near the grain boundary andthe size of primary γ' precipitates near the interdendritic regions were larger than the core. Theprimary γ' precipitated in the dendrite core dissolved early in the bonding process. γ' precipitatednear the interdendritic regions were partially solubilized and their shape was changed. Thedissolution rate increased with increasing temperature. Phases in the interdendritic regions or nearthe grain boundary changed continuously with time at the bonding temperature. At a bondingtemperature of 1403K, the eutectic phases remained, but η phases were transformed from a plateletshape to a needle morphology and the PFZ region widened with time. The interdendritic region andnear the grain boundary became partially liquid at 1423K and fully at 1453K by the reaction of ηphases and PFZ. The interdendritic region and near grain the boundary became liquid and newphases which were mixed with η phases, PFZ and MC carbide crystallized during cooling at 1453K.Crystalline η phases were transformed from a rod shape to a platelet shape with increasing holdingtime
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.65.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Interfacial Morphology of Duplex Stainless Steel Joints Brazed with Ni-Cr-Si-B Filler Metal (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 889-892 
    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: Microstructures of 0.18wt% nitrogen-contained duplex stainless steel, SUS329J〈sub〉3〈/sub〉L brazed in a vacuum furnace of 10〈sup〉-4〈/sup〉 torr, have been investigated as a function of bonding temperatures (1453-1523K) and holding times (0-1.8ks). An amorphous alloy, MBF50 (Ni-19.5wt%Cr-7.3wt%Si -1.5wt%B), was used as an insert metal. At an early stage at 1453K and 1473k, a morphology change of the insert metal, BN and CrB phase appeared only at the joints. The BN and Cr-Si-N phase were observed at the interface of the joints brazed under other conditions. The volume fraction of BN increased rapidly at an early stage and decreased with increasing holding time. The phase seemed to have been formed by dissolution of the base metal and the diffusion process. BN was formed easily due to the lowest Gibbs free energy.Boron content in liquid insert metal becomes low due to the formation of a large number of BNs at the bonded interlayer by holding for a few minutes at brazing temperature. This caused the rapid isothermal solidification of the liquid insert metal. Thus, it is clear that the isothermal solidification process of this bonding is controlled by the formation of boron nitrides as opposed to the diffusion process of depressant elements(B and Si) in the base metal
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.889.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Characteristics of CO〈sub〉2〈/sub〉 Laser Welded 800MPa Grade TRIP Steel (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 409-412 
    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 effect of welding conditions on defects, microstructure, mechanical properties and formability of CO〈sub〉2〈/sub〉welded 800MPa grade TRIP steel was investigated. Bead-on-plate welding was carried out under the various welding speed in 6kW with a shield gas of Helium. Extensive porosity was observed in the joints produced at a 4m/min of welding speed but was not observed in the joints when a welding speed greater than 6m/min was used. The maximum hardness was obtained at the weld metal and the HAZ near the weld metal and was the same regardless of the welding speed. The HAZ hardness near the base metal was reduced due to retained ferrite but was higher than that of the base metal. In a parallel tensile test to weld axis, the strength of the joints was higher than that of the base metal. Elongation was found to be lower than that of the raw material because a crack was initiated in the bead at the strength levels corresponding to the tensile strength of the base metal and was propagated perpendicular to tensile direction. The formability of joints was found to be 63% that of the raw material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.409.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructures of Oxidized Primary Carbides on Superalloy Inconel 718 (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 502 (Dec. 2005), p. 249-256 
    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 oxidation behavior of carbides on Inconel 718 surface was investigated. Oxidation tests were performed at the temperature range of 300 to 650℃. Two types of carbide, NbC and TiC were detected, and the amount of NbC was significantly higher than that of TiC. The oxidation of NbC started at the carbide surface and the matrix interface, and propagated into the interior of the carbide and eruption subsequently occurred with increasing oxidation time. In case of TiC, the oxidation occurred at the outer surface of the carbide and the matrix interface, but did not propagated into the interior of the carbide. Oxides formed on the outer surface of the TiC contained a relatively large amount of elemental Nb. The cross-section of oxidized specimen was investigated. NbC was oxidized more easily due to the significantly lower Gibbs free energy of oxidation than that of TiC. Eruption occurred mainly at the NbC because the Pilling-Bedworth ratio of Nb is higher than the critical value of 2.3 where eruption typically occurs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.502.249.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    CO〈sub〉2〈/sub〉 Laser Welding of 800MPa Grade TRIP Steel (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 2365-2370 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.2365.pdf
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