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

Journal Article · Sun Oct 01 04:00:00 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), Journal Name: Oxidation of Metals; (USA) Vol. 32:3-4; ISSN 0030-770X; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

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