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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 269-273 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigation into the hot steam corrosion of welded Incoloy 800 plateIn the weld seam of Incoloy the attack produced by hot steam (620 °C, 1000 h) is considerably increased. The reason thereof is the coarse grain structure formed during the solidification of the metal, because this transformation reduces the number of active lattice defects and thus inhibits the diffusion of the corrosion-preventing chromium. The favourable effect of cold working on corrosion resistance may, on the other hand, been explained in terms of an increased lattice defect density. The corrosion found during the hot steam experiments, however, need not be deemed dangerous because a strongly adherent scale layer is formed which does not give rise to selective penetration.
    Notes: In der Schweißnaht von Incoloy 800 ist der Angriff durch Heißdampf (620 °C, 1000 h) beträchtlich verstärkt. Ursache ist die Kornvergrößerung bei der Entrostung des Metalls, da hierbei die Zahl der aktiven Gitterdefekte abnimmt und die Diffusion des korrosionshemmenden Chroms behindert wird. Umgekehrt erklärt sich die günstige Wirkung einer Kaltverformung auf die Korrosionsbeständigkeit durch eine Steigerung der Gitterfehldichte. Die beobachtete Korrosion in Heißdampf ist jedoch nicht gefährlich, da hierbei eine festhaftende Deckschicht entsteht, ohne daß es zu selektiver Durchdringung kommt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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