FAILURE ASSESSMENT OF UHTC PLATE UNDER ELEVATED TEMPERATURE

2009 ◽  
Vol 23 (13) ◽  
pp. 1633-1640 ◽  
Author(s):  
TAO ZENG ◽  
FEI-FEI ZHOU ◽  
DAI-NING FANG ◽  
SHI YAN ◽  
YING GUO
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Oxide Film ◽  
Present Model ◽  
Failure Behavior ◽  
Ultra High Temperature Ceramics ◽  
Oxide Film Thickness ◽  
Failure Assessment ◽  
Griffith’S Theory ◽  
Failure Temperature

In the present study, a theoretical model is presented to assess the failure temperature for ultra-high temperature ceramics (UHTCs). Unlike traditional thermal shock theory, the parameters, such as thermal expansion coefficient and Young's modulus, are considered a function of temperature in the present model. The oxide film of UHTCs is also believed to grow under high temperature. Considering two kinds of conditions, the critical elevated temperature for delamination is calculated using Griffith's theory. By establishing the relation between temperature and the mechanical properties of UHTCs, it is found that the failure behavior of UHTCs is strongly affected by the oxide film thickness, initial temperature and the heating rate.

Effect of Oxide Film Thickness on Stress-Strain Field at the Tip of Stress Corrosion Cracking

2011 ◽  
Vol 474-476 ◽  
pp. 1128-1131
Author(s):  
Wei Tang ◽  
He Xue ◽  
Dan Zhao
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
Film Thickness ◽  
Strain Field ◽  
Water Environment ◽  
Structural Materials ◽  
Stress Strain ◽  
High Temperature Water ◽  
Oxide Film Thickness ◽  
Temperature Water

Environmentally assisted cracking (EAC) or stress corrosion cracking (SCC) of key structural materials in the environments of the light water reactor is one of the main problems for the management of the structural safety and service life of nuclear power plants. To understand the effect of oxide film thickness on SCC growth in structural materials in a high temperature water environment, the stress-strain field at the tip of a SCC in nickel base alloy constituted by base metal and oxide film was analyzed in this paper by finite element method using commercial software. The effects of oxide film thickness on the stress-strain field at the tip of the SCC was obtained, which provides a new insight into the research of the mechanism of SCC growth in structural materials in a high temperature water environment.

Liquid Oxide Flow during Oxidation of Zirconium Diboride-Silicon Carbide Ultra High Temperature Ceramics

2010 ◽  
Vol 434-435 ◽  
pp. 144-148 ◽  
Author(s):  
Sindhura Gangireddy ◽  
Sigrun N. Karlsdottir ◽  
J.W. Halloran
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Oxide Film ◽  
Boron Oxide ◽  
Zirconium Diboride ◽  
Ultra High Temperature Ceramics ◽  
Liquid Oxide ◽  
Film Microstructure ◽  
Ultra High Temperature

Recent ideas on the oxidation of ZrB2-SiC are presented, emphasizing the behavior of the boria-silica-zirconia liquid (BSZ liquid) which forms during oxidation and flows to transport silica and zirconia to the surface of the scale. Oxide film microstructure is strongly influenced by the boron oxide, which acts as a volatile flux.

Mechanical Behaviors of Ultra-High Temperature Ceramics

2010 ◽  
Vol 105-106 ◽  
pp. 210-212
Author(s):  
Fei Fei Zhou ◽  
Tao Zeng ◽  
Dai Ning Fang ◽  
Li Li Jiang
Keyword(s):  
Mechanical Properties ◽  
Thermal Expansion ◽  
High Temperature ◽  
Stress Field ◽  
Initial Temperature ◽  
Stress Fields ◽  
Mechanical Behaviors ◽  
Ultra High Temperature Ceramics ◽  
Oxide Film Thickness ◽  
High Temperature Condition

The parameters, such as thermal expansion coefficient and Young's modulus, are considered as a function of temperature and incorporated into ANSYS code to calculate the stress field of UHTCs under high temperature condition in the present work. The stress fields of two kinds of heating cases are calculated and compared. By establishing the relation between the temperature and the mechanical properties of the UHTCs, it is found that the mechanical behavior of UHTCs is strongly affected by the oxide film thickness, initial temperature and the heating rate.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

UDIMET 41

Alloy Digest ◽  
1964 ◽  
Vol 13 (6) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Precipitation Hardening ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Temperature Performance ◽  
Nickel Base ◽  
Corrosion And Oxidation

Abstract UDIMET 41 is a vacuum induction melted precipitation hardening nickel-base alloy having outstanding room and elevated temperature properties. It possesses excellent corrosion and oxidation resistance. It is designed for highly stressed components operating in the 1400-1700 deg F temperature range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-92. Producer or source: Special Metals Inc..

MO-RE 40MA

Alloy Digest ◽  
1998 ◽  
Vol 47 (12) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant ◽  
Temperature Performance

Abstract MO-RE 40MA is a fully austenitic heat-resistant alloy for elevated temperature applications. The alloy is microalloyed for creep strength and oxidation resistance. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance. Filing Code: Ni-548. Producer or source: Duraloy Technologies Inc.

UDDEHOLM QRO 80 MICRODIZED

Alloy Digest ◽  
1987 ◽  
Vol 36 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Die Casting ◽  
Heat Treating ◽  
Temperature Performance ◽  
Improved Performance

Abstract UHB QRO 80 MICRODIZED is a chromium-molybdenum-vanadium tool steel with improved performance for tooling used at elevated temperature as in forging, extrusion and die casting. It is electro-slag refined. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-486. Producer or source: Uddeholm Aktiebolag.

J&L TYPE 309

Alloy Digest ◽  
2003 ◽  
Vol 52 (12) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Good Combination ◽  
Resistance To Oxidation ◽  
Cold Worked ◽  
Specialty Steel

Abstract Type 309 (UNS S30900) is an austenitic chromium-nickel stainless steel widely used for elevated-temperature services. It has a good combination of oxidation resistance and corrosion-resisting properties. The alloy is essentially nonmagnetic when annealed and become slightly magnetic when cold worked. It is intended primarily for high-temperature applications at 816 deg C (1500 deg F) or higher where resistance to oxidation and/or corrosion is required. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-896. Producer or source: J & L Specialty Steel Inc.

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