Creep-strengthening of steel at high temperatures using nano-sized carbonitride dispersions

Masaki Taneike, Fujio Abe () and Kota Sawada
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Masaki Taneike: National Institute for Materials Science
Fujio Abe: National Institute for Materials Science
Kota Sawada: National Institute for Materials Science

Nature, 2003, vol. 424, issue 6946, 294-296

Abstract: Abstract Creep is a time-dependent mechanism of plastic deformation, which takes place in a range of materials under low stress—that is, under stresses lower than the yield stress1. Metals and alloys can be designed to withstand creep at high temperatures, usually by a process called dispersion strengthening2, in which fine particles are evenly distributed throughout the matrix. For example, high-temperature creep-resistant ferritic steels achieve optimal creep strength (at 923 K) through the dispersion of yttrium oxide nanoparticles3. However, the oxide particles are introduced by complicated mechanical alloying techniques and, as a result, the production of large-scale industrial components is economically unfeasible. Here we report the production of a 9 per cent Cr martensitic steel dispersed with nanometre-scale carbonitride particles using conventional processing techniques. At 923 K, our dispersion-strengthened material exhibits a time-to-rupture that is increased by two orders of magnitude relative to the current strongest creep-resistant steels4. This improvement in creep resistance is attributed to a mechanism of boundary pinning by the thermally stable carbonitride precipitates. The material also demonstrates enough fracture toughness. Our results should lead to improved grades of creep-resistant steels and to the economical manufacture of large-scale steel components for high-temperature applications.

Date: 2003
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DOI: 10.1038/nature01740

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