Thermal Cycling Effects on Oxidation Behaviors of Commercial High-Temperature Alloys

Abstract High-temperature oxidation tests provide valuable data guiding alloy selection in industry applications, and cyclic oxidation is one of the most important and frequently used testing procedures. For industrial processes, alloy components are exposed under different thermal cycling conditions, with cycles varying from a few minutes to years. It is well-known that thermal cycling has significant effects on the oxidation behaviors of an alloy due to scale cracking and spallation. The present paper studies oxidation behaviors of widely used commercial high-temperature alloys, N07214, NiCoCrMoAl, NiFeCrAl, N06230, R30188, N06625, N06617, N06002, N08120, N08811, and 347 stainless steel, under different thermal cycling conditions, i.e. from 30min cycling to 30-day cycling, at 760-1093°C (1400-2000°F). Thermal cycling effects on the oxidation of the aforementioned alloys, that include both alumina- and chromia-formers, are evaluated and discussed, along with the effects of temperature and testing atmosphere. Measured values of metal loss and internal oxidation penetration are used to evaluate alloy oxidation behaviors under thermal cycling conditions.