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This article concerns investigations on the deformation/corrosion interactions of the three advanced high temperature alloys MA 956, Nicrofer 45 TM and HR3C. The technical background is related to conditions to be expected for heat exchanger tubes in coal gasification plants. The results have shown a very acceptable corrosion resistance for all the alloys. Differences for stress-free and stressed samples centered on enhanced local attack. Approximately 2% strain was needed for the corrosion in stressed samples to exceed clearly that of stress-free samples. The mechanism of corrosion enhancement was characterized by the formation of thin cracks which extended into the alloy under simultaneous corrosion/creep interaction at the crack tip. Concerning the technical deliverables, it was discovered that low creep strain can degrade the corrosion resistance of advanced high temperature materials. Deformation-corrosion interaction experiments are needed for a reliable judgement of the material potentials.

Additional information

Authors: GUTTMANN U, JRC Petten (NL);STEIN K, Forschungszentrum Karlsruhe GmbH (DE);BAKKER W T, EPRI, Palo Alto (US)
Bibliographic Reference: Article: Materials at High Temperatures (1997)
Record Number: 199711535 / Last updated on: 1997-12-09
Original language: en
Available languages: en
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