CREEP FAILURE OF A GAMMA PRIME-STRENGTHENED ALUMINA-FORMING AUSTENITIC STAINLESS STEEL

被引：0

作者：

Hu, B. ^{[1
]}

Baker, I. ^{[2
]}

Kernion, S. J. ^{[3
]}

Yamamoto, Y. ^{[4
]}

Brady, M. P. ^{[4
]}

机构：

[1] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA

[2] Dartmouth Coll, Thayer Sch Engn, 14 Engn Dr, Hanover, NH 03755 USA

[3] Carpenter Technol, 2 Meridian Blvd, Wyomissing, PA 19610 USA

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

来源：

ADVANCES IN MATERIALS TECHNOLOGY FOR FOSSIL POWER PLANTS: PROCEEDINGS FROM THE EIGHTH INTERNATIONAL CONFERENCE, 2016 | 2016年

关键词：

COAL POWER-PLANTS; MICROSTRUCTURE; SUPERALLOY; RESISTANCE; BEHAVIOR; ALLOYS;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Alumina-forming austenitic stainless steels (AFAs) are potential materials for boiler/steam turbine applications in next generation fossil fuel power plants. They display a combination of good high temperature creep strength, excellent oxidation resistance and low cost. A recently-developed AFA alloy based on Fe-14Cr-32Ni-3Nb-3AI-2Ti (wt.%) shows better creep performance than a commercially-available Fe-based superalloy. In this paper we used scanning electron microscopy and transmission electron microscopy to study the fracture surfaces and cracking behavior in relation to the precipitates present in creep failure samples of this alloy tested at either 750 degrees C/100 MPa or 700 degrees C/170 MPa. It was found that most cracks are formed along the grain boundaries with precipitate-free zones beside the grain boundaries potentially providing the path for propagation of cracks.

引用

页码：295 / 303

页数：9

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