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  • 1
    Electronic Resource
    Electronic Resource
    Isothermal Oxidation Behavior of Ni Base Superalloy DM02 for High Temperature Dies (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1253-1256 
    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 isothermal oxidation behavior of a new developed Ni base superalloy named DM02for high temperature dies was studied in this paper. The dynamic curve was achieved by monitoringweight gain of the alloy as a function of time. The results showed that the alloy had fairly goodoxidation resistance at 1050°C and 1100°C. The oxidation kinetics at both 1050°C and 1100°Cfollowed parabolic rules in segment. It has been found that the oxidation of the alloy was controlledby multi-oxides of (Ni, Co)O, (Ni, Co)Al2O4, and NiWO4, growth mechanism in the primary stage,and by Al2O3, NiAl2O4 growth mechanism in the following stage. After oxidation at 1050°C for 100h,the oxide scale of the alloy was mainly composed of two areas. Some were thin uniform (Ni，Co)Al2O4(outer)/Al2O3 (inner) composites scale and others were multi-layer oxide scale of ( Ni,Co)O/ multi-oxides (mainly NiWO4、NiO and NiAl2O4.) /Al2O3
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1253.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Cr and Al on High Temperature Oxidation Resistance of Nb-Si System Intermetallics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1485-1488 
    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 effects of Cr and Al on high temperature oxidation resistance of Nb-Si systemintermetallics have been investigated by scanning electron microscopy (SEM), X-ray diffraction(XRD) and weight gain method. The results showed that the high temperature oxidation resistancecan be substantially improved by proper Cr or Al addition. The further analysis revealed that Crpromotes the formation of CrNbO4 in scale and improve the adherence between the oxide scale andthe substrate. It also found that Al improves the surface morphology of oxide scale and changesoxidation products by promoting the AlNbO4 formation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1485.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Alloying Elements on Microstructure and Mechanical Properties of High Temperature Die Material DM02 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1257-1260 
    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 Ta, Nb, Hf and Zr on the microstructure and high temperature tensileproperties of DM02 alloy, which is a novel developed Ni base superalloy for high temperature diematerial, had been studied in this paper. The results showed that the four alloying elements affect thecomposition and morphology of carbides obviously, and have almost no effect on the morphology andsize of γ´ phase in DM02 alloy. 0.5-1wt% Hf make the morphology of MC carbide change frombone-like to blocky and inhibit the formation of primary M6C carbide, thus improve the ductility ofDM02 alloy, while 0.1wt% Zr has no similar effect. The strengthening effect of 3wt% Ta is betterthan that of 1.5wt% Nb. DM02 alloy with 3wt% Ta and 0.5wt% Hf has high strength and goodductility at 1050°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1257.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Y Ion Implantation on Oxidation Behavior of IC6 Alloy at 1100°C (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 767-770 
    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 ion implantation of yttrium on the oxidation behavior of Ni3Al base alloyIC6 at 1100℃ was investigated by SEM/EDS, TEM and XRD methods. The results indicated that after Y ion implantation, the surface of IC6 alloy changed from large column crystals to fine distributed nano-crystals, and the density of dislocations in distorted region increased with the implanted ions dose, which can act as high-diffusivity path and oxide core. Comparing to un-implanted IC6 alloy, Y-implantation increased the oxidation rate of IC6 alloy in initial 25 h at 1100℃, but decreased the maximum weight gain and the oxidation rate in final period. Moreover, the oxide scales of Y-implanted IC6 alloy were more continuous and compact due to the benefit effect of yttrium, and had better coherence to substrate through reduction of oxide grain size resulting in oxide scale plasticity improvement. Hence the proper amount of implanted Y could improve the oxidation resistance of IC6 alloy at 1100℃ in air slightly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.767.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Ta on the Oxidation Resistance of a Cast Nickel-Base Die Material with Low Cr and High W Content (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 669-672 
    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: A conventional cast nickel-base superalloy with the chemical composition of Ni-16W-2Mo-1.5Cr-6Al wt % has been recently developed as isothermal forging die material operating at temperatures above 1000℃. The oxidation test results showed that the oxide scale spalled heavily after exposure in air at 1050℃ for 100 h, which is unacceptable for the process of isothermal forging. To improve the high temperature oxidation resistance, 3 wt% Ta was added into the alloy. Specimens after oxidation test were analyzed by the scanning electron microscope (SEM) and the X-ray diffraction analysis (XRD). The results showed that the oxides were mainly NiO, NiWO4, and NiAl2O4 for all the samples. The oxidation resistance of the alloy with 3wt%Ta was fairly good at 1050℃ with the mass gain rate of around 0.016g/m2•h and spallation of oxides less than 2g/m2 within 100h.The SEM results showed that a continuous protective layer of Al2O3 has been formed under the layer of NiO for the alloy containing Ta
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.669.pdf
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