The influence of a titanium nitride dispersion on the oxidation behavior of 20%Cr-25%Ni stainless steel

Journal Article · Fri Dec 01 00:00:00 EST 1978 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00603805· OSTI ID:6877374

Evans, H E ^[1]; Hilton, D A ^[2]

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1. Central Electricity Generating Board, Berkeley Nuclear Laboratories, Berkeley, Glos., England
2. U.K. Atomic Energy Authority, Springfields Nuclear Power Development Laboratories, Preston, Lancs., England

The oxidation behavior of 20%Cr-25%Ni stainless steels and a similar but stronger alloy containing a dispersion of titanium nitride particles has been studied over the temperature range 1023 to 1173 deg K. The dispersion-strengthened steel oxidized slightly more slowly than its dispersion-free counterpart at 1023 K, but above this temperature it was inferior in terms of gross weight gain. The parabolic growth kinetics of the chromic oxide layer in each alloy were similar, however, with an activation energy compatible with the rate-controlling step being chromium ion diffusion across the oxide. The evidence suggests that the role of the dispersed phase is to produce an oxide of finer grain size than that of the standard steel, which increases the rate of oxygen transport inward. The consequent formation of internal oxide increases the tendency for oxide rupture and spalling with subsequent enhanced local attack. This leads to the observed higher overall weight gains compared with the dispersion-free alloy.

• OSTI ID: 6877374
• Journal Information: Oxid. Met.; (United States), Vol. 12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL-CHROMIUM STEELS
CORROSION RESISTANCE
STAINLESS STEELS
ACTIVATION ENERGY
CHROMIUM OXIDES
OXYGEN
PRECIPITATION HARDENING
REACTION KINETICS
TEMPERATURE DISTRIBUTION
TITANIUM NITRIDES
VERY HIGH TEMPERATURE
ALLOYS
CHALCOGENIDES
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CORROSION RESISTANT ALLOYS
ELEMENTS
ENERGY
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
NICKEL ALLOYS
NICKEL STEELS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
STEELS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360105* - Metals & Alloys- Corrosion & Erosion