ISSN:
1573-4889
Keywords:
nickel-based alloys
;
hydrogen-hydrogen sulfide
;
hydride formation
;
sulfidation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The modes of degradation experienced by a Ni-15Cr and three Ni-15Cr-xZr alloys (where x=1, 5, or 10 wt. %) after exposure to a 1% H2S/H2 gas mixture at 1000° C have been examined, with particular reference to the morphological features. The addition of Zr at about the 1% level has been shown to have a beneficial effect, in terms of reduced weight gain relative to the Ni-15Cr control, explained by a thinner more protective external “CrS” scale, and a decreased tendency for “CrS” subscale formation (internal sulfidation). Zr additions beyond 1%, up to 5 and 10%, become increasingly detrimental principally on account of extensive internal “ZrHx” formation, associated with the selective attack of the increasing amounts ofNi5Zr in the alloy microstructures. The mode of action of Zr at about the 1% level in these alloys is considered in the light of earlier studies concerning the performance of similar alloys in O/S atmospheres.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00603988
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