Oxidation of high-temperature alloys (superalloys) at elevated temperatures in air: I

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF01080783· OSTI ID:7269939

Hussain, N; Shahid, K A; Rahman, S ^[1]; Khan, I H ^[2]

---

1. Pakistan Inst. of Nuclear Science and Technology, Islamabad (Pakistan)
2. Univ. of the Punjab, Lahore (Pakistan)

Four commercial alloys - Hastelloy C-4, alloy 1.4306S (SS 304L), Incoloy 800H, and Incoloy 825 - were studied for their oxidation behavior at elevated temperatures. Specimens were exposed to air from 600 to 1200[degree]C for 1 to 400 hr. Reaction kinetics of oxidation were determined, and the morphology of the surface-oxide scales was investigated. Hastelloy C-4 showed better resistance to oxidation for exposure temperatures up to 1000[degree]C in comparison with the other three alloys. In this temperature range, it follows a cubic rate law of oxidation due to formation of uniform, protective, and adherent oxide scales. The latter three alloys obeyed the parabolic rate law at 1000[degree]C and 1200[degree]C, but for lower temperatures a mixed behavior was shown. The oxide layer developed on the alloy 1.4306S was always in the form of stratified nodules/warts. For longer exposures the nodules joined each other to form continuous but discrete layers. Incoloy 800H and Incoloy 825 behaved in an almost identical manner, their reaction kinetics being governed by the parabolic rate law throughout the temperature range. Oxide spalling was observed at all temperatures. In contrast to Incoloy 800H the Incoloy 825 was totally oxidized for longer exposures at 1200[degree]C. 16 refs., 12 figs., 1 tab.

• OSTI ID: 7269939
• Journal Information: Oxidation of Metals; (United States), Vol. 41:3-4; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
36 MATERIALS SCIENCE
HEAT RESISTING ALLOYS
OXIDATION
CHEMICAL REACTION KINETICS
HASTELLOY C
INCOLOY 800H
INCOLOY 825
NUCLEAR ENGINEERING
OXIDES
SCALING
STAINLESS STEEL-304L
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
ALLOY-FE44NI33CR21
ALLOY-NI43FE30CR22MO3
ALLOY-NI54MO17CR16FE6W4
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
AUSTENITIC STEELS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COBALT ALLOYS
COPPER ALLOYS
CORROSION RESISTANT ALLOYS
ENGINEERING
HASTELLOYS
HEAT RESISTANT MATERIALS
HIGH ALLOY STEELS
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
LOW CA
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOY
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXYGEN COMPOUNDS
REACTION KINETICS
STAINLESS STEELS
STEEL-CR19NI10-L
STEELS
TEMPERATURE RANGE
TI
TITANIUM ADDITIONS
TUNGSTEN ALLOYS
VA
VANADIUM ADDITIONS
220200* - Nuclear Reactor Technology- Components & Accessories
360105 - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies