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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Morphology and properties of semi-IPNs of polyetherimide and bisphenol A dicyanate (1995)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 6 (1995), S. 402-412 
    Details
    ISSN: 1042-7147
    Keywords: Semi-IPN ; phase separation ; sea-island morphology ; dual-phase morphology ; nodular morphology ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Semi-interpenetrating polymer networks (semi-IPNs) were synthesized from mixtures of polyetherimide (PEI) and bisphenol A dicyanate (BPACY) at different compositions and different cure temperatures. The phase separation behavior during cure was analyzed in terms of glass transtion temperature (Tg) behavior of fully cured semi-IPNs and the morphology-property relationship was also studied. The mixtures of PEI and BPACY monomer showed upper critical solution temperature behavior and their semi-IPNs showed sea-island morphology in 1-14 wt% PEI composition, dual-phase morphology in 15-19 wt% PEI composition and nodular morphology in 20-60 wt% PEI composition, respectively. The sea-island morphology was formed via nucleation and growth, while the other morphologies were predominantly formed via spinodal decomposition. Cure temperature did not influence the macroscopic morphology, but the domain size changed with temperature. As cure temperature was increased, the PEI domain size in the sea-island morphology decreased, while the BPACY nodule size increased in the nodular morphology. Mechanical and thermal properties were so strongly dependent upon the morphology that they changed dramatically near the phase inversion point.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1995.220060604
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