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  • 1
    Electronic Resource
    Electronic Resource
    Effects of mode-I stresses on the oxidation and failure mechanisms of Ni-20Cr and Ni-15Cr-8Fe alloys in sulfur dioxide (1993)
    Springer
    Oxidation of metals 39 (1993), S. 155-165 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; sulfidation ; nickel alloys ; stresses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two alloys, Ni-20Cr and Ni-15Cr-8Fe, as wire specimens, were exposed to sulfur dioxide between 325 and 800°C, with applied external stresses (mode I). Their mechanical properties have been investigated, and the variation of their radius has been precised by conductivity measurements. For the Ni-20Cr alloy, below 550°C, the failure process combines cracking and corrosion: Cr2S3 crystals formed at the tip of the cracks facilitate their propagation. Above 550°C, no barrier effect is observed, and intergranular corrosion takes place. For the Ni-15Cr-8Fe alloy, mode-I stresses bolster intergranular corrosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665609
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  • 2
    Electronic Resource
    Electronic Resource
    High temperature corrosion of Ni-20Cr and Ni-15Cr-8Fe alloys in sulfur dioxide (1993)
    Springer
    Oxidation of metals 39 (1993), S. 211-220 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; sulfidation ; nickel alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two nickel-base alloys, Ni-20Cr and Ni-15Cr-8Fe, in the form of wire specimens, have been exposed to 100 mbar of sulfur dioxide between 550 and 850°C. For Ni-20Cr, an outer Cr2O3 layer formed only at the beginning of the reaction, but very quickly Ni3S2 grew preferentially at the exterior by outward diffusion of nickel. The reaction rate is regulated by an external interfacial process. A barrier effect was noted near 645°C associated with the formation of NiCr2O4; a new acceleration takes place above 680°C. The external growth of Ni3S2 is attributed to the low radius of curvature of the samples. For Ni-15Cr-8Fe, the reaction mechanism is rather similar, except that no barrier effect occurred. A protective Cr2O3 layer formed above 800°C in both cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665612
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interspecific somatic hybridization between Brassica napus and Brassica hirta (Sinapis alba L.) (1988)
    Springer
    Theoretical and applied genetics 75 (1988), S. 546-552 
    Details
    ISSN: 1432-2242
    Keywords: Brassica napus ; Brassica hirta ; Somatic hybridization ; mtDNA ; ctDNA ; rDNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Somatic hybridization between Brassica napus and B. hirta (or Sinapis alba) is described. No cybrid plant with B. napus nucleus exhibiting cytoplasmic male sterility was recovered. Somatic hybrids were identified morphologically and, for some of them, by cytological observations. They were also characterised by Southern hybridization of nuclear rDNA. Chloroplast and mitochondrial DNA restriction analysis showed that 2 plants out of 14 have B. hirta ctDNA, one the B. napus mtDNA and the other a hybrid. Nine possess B. napus ctDNA with a hybrid mtDNA. For six of them, mtDNA patterns present novel bands, suggesting intergenomic recombination during fusion. These hybrids will be included in the breeding program.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289119
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    Paper (German National Licenses)
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