Creep-resistant, Al2O3-forming austenitic stainless steels

被引：383

作者：

Yamamoto, Y. ^{[1
]}

Brady, M. P. ^{[1
]}

Lu, Z. P. ^{[1
]}

Maziasz, P. J. ^{[1
]}

Liu, C. T. ^{[1
]}

Pint, B. A. ^{[1
]}

More, K. L. ^{[1
]}

Meyer, H. M. ^{[1
]}

Payzant, E. A. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

来源：

SCIENCE | 2007年 / 316卷 / 5823期

关键词：

D O I：

10.1126/science.1137711

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 degrees C and 100 megapascals in air, and resistance to oxidation in air with 10% water vapor at 650 degrees and 800 degrees C, were demonstrated.

引用

页码：433 / 436

页数：4

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