Creep-resistant, Al2O3-forming austenitic stainless steels

Y. Yamamoto; M. P. Brady; Z. P. Lu; P. J. Maziasz; C. T. Liu; B. A. Pint; K. L. More; H. M. Meyer; E. A. Payzant

doi:10.1126/science.1137711

Creep-resistant, Al₂O₃-forming austenitic stainless steels

Y. Yamamoto, M. P. Brady, Z. P. Lu, P. J. Maziasz, C. T. Liu, B. A. Pint, K. L. More, H. M. Meyer, E. A. Payzant

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

396 Scopus citations

Abstract

A family of inexpensive, Al₂O₃-forming, high-creep strength austenitic stainless steels has been developed. The alloys are based on Fe-20Ni-14Cr-2.5Al weight percent, with strengthening achieved through nanodispersions of NbC. These alloys offer the potential to substantially increase the operating temperatures of structural components and can be used under the aggressive oxidizing conditions encountered in energy-conversion systems. Protective Al₂O₃ scale formation was achieved with smaller amounts of aluminum in austenitic alloys than previously used, provided that the titanium and vanadium alloying additions frequently used for strengthening were eliminated. The smaller amounts of aluminum permitted stabilization of the austenitic matrix structure and made it possible to obtain excellent creep resistance. Creep-rupture lifetime exceeding 2000 hours at 750°C and 100 megapascals in air, and resistance to oxidation in air with 10% water vapor at 650° and 800°C, were demonstrated.

Original language	English
Pages (from-to)	433-436
Number of pages	4
Journal	Science
Volume	316
Issue number	5823
DOIs	https://doi.org/10.1126/science.1137711
State	Published - Apr 20 2007

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title = "Creep-resistant, Al2O3-forming austenitic stainless steels",

abstract = "A family of inexpensive, Al2O3-forming, high-creep strength austenitic stainless steels has been developed. The alloys are based on Fe-20Ni-14Cr-2.5Al weight percent, with strengthening achieved through nanodispersions of NbC. These alloys offer the potential to substantially increase the operating temperatures of structural components and can be used under the aggressive oxidizing conditions encountered in energy-conversion systems. Protective Al2O3 scale formation was achieved with smaller amounts of aluminum in austenitic alloys than previously used, provided that the titanium and vanadium alloying additions frequently used for strengthening were eliminated. The smaller amounts of aluminum permitted stabilization of the austenitic matrix structure and made it possible to obtain excellent creep resistance. Creep-rupture lifetime exceeding 2000 hours at 750°C and 100 megapascals in air, and resistance to oxidation in air with 10% water vapor at 650° and 800°C, were demonstrated.",

author = "Y. Yamamoto and Brady, {M. P.} and Lu, {Z. P.} and Maziasz, {P. J.} and Liu, {C. T.} and Pint, {B. A.} and More, {K. L.} and Meyer, {H. M.} and Payzant, {E. A.}",

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AU - Yamamoto, Y.

AU - Brady, M. P.

AU - Lu, Z. P.

AU - Maziasz, P. J.

AU - Liu, C. T.

AU - Pint, B. A.

AU - More, K. L.

AU - Meyer, H. M.

AU - Payzant, E. A.

PY - 2007/4/20

Y1 - 2007/4/20

N2 - A family of inexpensive, Al2O3-forming, high-creep strength austenitic stainless steels has been developed. The alloys are based on Fe-20Ni-14Cr-2.5Al weight percent, with strengthening achieved through nanodispersions of NbC. These alloys offer the potential to substantially increase the operating temperatures of structural components and can be used under the aggressive oxidizing conditions encountered in energy-conversion systems. Protective Al2O3 scale formation was achieved with smaller amounts of aluminum in austenitic alloys than previously used, provided that the titanium and vanadium alloying additions frequently used for strengthening were eliminated. The smaller amounts of aluminum permitted stabilization of the austenitic matrix structure and made it possible to obtain excellent creep resistance. Creep-rupture lifetime exceeding 2000 hours at 750°C and 100 megapascals in air, and resistance to oxidation in air with 10% water vapor at 650° and 800°C, were demonstrated.

AB - A family of inexpensive, Al2O3-forming, high-creep strength austenitic stainless steels has been developed. The alloys are based on Fe-20Ni-14Cr-2.5Al weight percent, with strengthening achieved through nanodispersions of NbC. These alloys offer the potential to substantially increase the operating temperatures of structural components and can be used under the aggressive oxidizing conditions encountered in energy-conversion systems. Protective Al2O3 scale formation was achieved with smaller amounts of aluminum in austenitic alloys than previously used, provided that the titanium and vanadium alloying additions frequently used for strengthening were eliminated. The smaller amounts of aluminum permitted stabilization of the austenitic matrix structure and made it possible to obtain excellent creep resistance. Creep-rupture lifetime exceeding 2000 hours at 750°C and 100 megapascals in air, and resistance to oxidation in air with 10% water vapor at 650° and 800°C, were demonstrated.

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JO - Science

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ER -

Creep-resistant, Al₂O₃-forming austenitic stainless steels

Abstract

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