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  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of Flow Instability in High Temperature Deformation of INCONEL Alloy 783 Using Processing Map Approach (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 501-504 
    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: The high temperature deformation behavior and flow instabilities of Ni-Fe-Co basesuperalloy, INCONEL alloy 783 during hot working process were investigated with process mapsconsisting of a power dissipation of dynamic materials model (DMM) and various flow instabilitycriteria. In order to establish the processing map of INCONEL alloy 783, hot compression tests werecarried out under different temperature and strain rate conditions, with true strain up to 0.7. On thebasis of the comparison between processing maps and microstructural analysis, the reliability ofvarious flow instability criteria was estimated. Finally the useful instability criterion for predicting theforming defects was suggested through the compression test results and experimental observations ofactual ring rolling process of INCONEL alloy 783
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.501.pdf
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    Paper (German National Licenses)
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