Scale formation on the Ni-base superalloys IN 939 and IN 738 LC

Journal Article · Sun Oct 01 00:00:00 EDT 1989 · Oxidation of Metals; (USA)

DOI:https://doi.org/10.1007/BF00664797· OSTI ID:6086029

Litz, J; Rahmel, A; Schorr, M ^[1]; Weiss, J ^[2]

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1. Dechema-Institut, Frankfurt am Main (West Germany)
2. ABB Asea Brown Boveri AG, Mannheim (West Germany)

The scales formed on the superalloys IN 939 and IN 738 LC at 700, 900, and 1,100{degree}C in air have been investigated by optical, microprobe analysis and x-ray diffraction measurements. Both alloys form very similar scales. The main components are an outer TiO{sub 2} layer, an intermediate Cr{sub 2}O{sub 3} layer with dissolved Ti, and an inner layer of (Ti, Nb, Ta)O{sub 2} with rutile structure. Beneath the scale an internal corrosion zone is formed that contained Al{sub 2}O{sub 3} directly beneath the external scale and TiN further into the substrate.

• OSTI ID: 6086029
• Journal Information: Oxidation of Metals; (USA), Vol. 32:3-4; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
CORROSION
SCALE CONTROL
DATA ANALYSIS
EXPERIMENTAL DATA
HIGH TEMPERATURE
MEASURING INSTRUMENTS
MEASURING METHODS
RUTILE
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DATA
INFORMATION
MATERIALS
MINERALS
NICKEL ALLOYS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
360105* - Metals & Alloys- Corrosion & Erosion