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Effects of Minor Alloying Elements on the Metal-Dusting Behavior of Ni-Based Alloys

Alloys are often found to suffer much greater metal-dusting attack under high-pressure conditions compared to ambient-pressure conditions. Ultimately, the resistance of a given alloy to metal dusting depends on the formation of an oxide scale that is impermeable to carbon which, in turn, depends on scale composition and structure. This paper reports the metal-dusting behavior of several Ni-based alloys having relatively high Cr contents (about 30 wt.%) and different controlled minor levels of Fe, Al, and/or Si. Testing was conducted under 20 bar total pressure of a high-carbon-activity gas at 600 °C (1112 °F). The exposed alloys were analyzed by SEM and TEM techniques to evaluate the oxide scales and evidence of carbon ingress. It was found that aluminum is beneficial to improve metal dusting resistance by reacting to form a continuous inner layer of alumina; whereas iron is detrimental to resistance. Mechanistic aspects of the role(s) played by minor elements in affecting metal-dusting resistance are considered.  

Product Number: 51320-14657-SG
Author: Bingtao Li, Wei-Ting Chen, Brian Gleeson, Heike Hattendorf
Publication Date: 2020
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00257 Alloy Selection for Environments Which Promote Metal Dusting

Product Number: 51300-00257-SG
ISBN: 00257 2000 CP
Author: Brian A. Baker and Gaylord D. Smith
$20.00