EFFECT OF HUMIDITY LEVEL ON THE CREEP PROPERTIES OF ALLOY 903 AT 650°C

被引：0

作者：

Dryepondt, Sebastien ^{[1
]}

Mitchell, Ryan D.

Pint, Bruce A. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Knoxville, TN 37831 USA

来源：

PROCEEDINGS OF THE ASME TURBO EXPO 2012, VOL 5 | 2012年

关键词：

EMBRITTLEMENT; OXYGEN;

D O I：

暂无

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Alloy 903 (FeNiCo+Nb) is currently used for certain components in industrial gas turbines for low coefficient of thermal expansion applications. A variance in creep behavior for material quality control evaluations suggested a possible effect of moisture level on stress rupture properties. To investigate the role of water vapor on the creep properties of alloy 903, controlled laboratory experiments were conducted at 650 degrees C with 0 to 100% relative humidity. The water content was controlled by flowing thy air through a water bath at a constant temperature. A significant decrease of lifetime was observed in the presence of water vapor which is likely related to grain boundary embrittlement by the inward diffusion of hydrogen. The increase of the microstructure grain aspect ratio by different forging processes generally improved the rupture lifetime and elongation in air. However, all specimens had reduced lifetime in the presence of water vapor despite the microstructure grain aspect ratios.

引用

页码：119 / 127

页数：9

共 15 条

[1]

ANDRIEU E, 1994, SUPERALLOYS 718, 625, 706 AND VARIOUS DERIVATIVES, P619

[2]

[Anonymous], CRC HDB CHEM PHYS

[3]

ASTM International, 2010, E11210 ASTM INT

[4] GRAIN-BOUNDARY EMBRITTLEMENT OF THE IRON-BASE SUPERALLOY-IN903A [J].

BRICKNELL, RH ;

WOODFORD, DA .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1981, 12 (09) :1673-1680

[5]

Coffin L.F., 1972, P INT C FAT CHEM MEC, P590

[6]

Floreen S., 1983, FLOW FRACTURE ELEVAT, P383

[7] Oxygen embrittlement and time-dependent grain-boundary cracking of ALLVAC 718PLUS [J].

Hayes, R. W. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2008, 39A (11) :2596-2606

[8] EFFECT OF ENVIRONMENT ON THE RUPTURE BEHAVIOR OF ALLOYS 909 AND 718 [J].

HAYES, RW ;

SMITH, DF ;

WANNER, EA ;

EARTHMAN, JC .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, 177 (1-2) :43-53

[9]

ISO International Standard, 2003, ISO643

[10]

Smith D. F., 1980, P 4 INT C SUP SUP 19, P521

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