Progress of Research on Welding for Molybdenum Alloys

2014 ◽  
Vol 33 (3) ◽  
pp. 193-200 ◽  
Author(s):  
Jiteng Wang ◽  
Juan Wang ◽  
Yajiang Li ◽  
Deshuang Zheng
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Low Temperature ◽  
Welded Joint ◽  
Structural Materials ◽  
Practical Applications ◽  
Traditional Technology ◽  
Molybdenum Alloys ◽  
Resistance To Oxidation ◽  
Temperature Applications

AbstractMolybdenum and molybdenum alloys are considered to be attractive structural materials for high-temperature applications. However, molybdenum alloys are sensitive to gas impurities and have the characteristics of low temperature embrittlement and less resistance to oxidation at elevated temperature. The toughness and strength of welded joint is not easy to be ensured by traditional technology. Recently, many efforts have been made to join molybdenum and its alloys. In this paper, we present the result of investigations on welding methods of molybdenum and its alloys and overview the practical applications in engineering. The key of joining molybdenum alloys is to improve the toughness of welded joint and prevent the generation of pores and cracks.

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.

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.

Profiling Different Kinds of Generated Defects at Elevated Temperature in Both SiO2 and High-k Dielectrics

2010 ◽  
Vol 1252 ◽  
Author(s):  
Sahar Sahhaf ◽  
Robin Degraeve ◽  
Mohammed Zahid ◽  
Guido Groeseneken
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Low Temperature ◽  
Leakage Current ◽  
Charge Injection ◽  
Constant Voltage ◽  
High K ◽  
Voltage Stress ◽  
Stress Induced Leakage Current ◽  
High K Dielectric

AbstractIn this work, the effect of elevated temperature on the generated defects with constant voltage stress (CVS) in SiO2 and SiO2/HfSiO stacks is investigated. Applying Trap Spectroscopy by Charge Injection and Sensing (TSCIS) to 6.5 nm SiO2 layers, different kinds of generated traps are profiled at low and high temperature. Also the Stress-Induced Leakage Current (SILC) spectrum of high-k dielectric stack is different at elevated temperature indicating that degradation and breakdown at high temperature is not equivalent to that at low temperature and therefore, extrapolation of data from high to low T or vice versa is challenging.

Molybdenum alloys for high temperature applications in air

2008 ◽  
Vol 51 (2) ◽  
pp. 99-102 ◽  
Author(s):  
P. Jéhanno ◽  
M. Böning ◽  
H. Kestler ◽  
M. Heilmaier ◽  
H. Saage ◽  
...  
Keyword(s):  
High Temperature ◽  
Molybdenum Alloys ◽  
Temperature Applications

Low temperature joining of GH3039 for high temperature applications with Au-Si isothermal solidification

2020 ◽  
Vol 281 ◽  
pp. 128668
Author(s):  
Wanqi Zhao ◽  
Panpan Lin ◽  
Tiesong Lin ◽  
Peng He ◽  
Weimin Long ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Isothermal Solidification ◽  
Temperature Applications

C-103

Alloy Digest ◽  
2000 ◽  
Vol 49 (11) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Density Ratio ◽  
High Strength ◽  
Niobium Alloy ◽  
Temperature Performance ◽  
Temperature Applications

Abstract Alloy C-103 is a niobium alloy with a high strength/density ratio for elevated temperature applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, machining, and joining. Filing Code: CB-25. Producer or source: ATI Wah Chang, Allegheny Technologies.

A Perspective on MoSi2 Based Composites

1992 ◽  
Vol 273 ◽  
Author(s):  
J. J. Petrovic ◽  
A. K. Vasudevan
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Elevated Temperature ◽  
Low Temperature ◽  
Oxidation Behavior ◽  
Developmental History ◽  
New Class ◽  
Structural Applications ◽  
History Of ◽  
Temperature Fracture

ABSTRACTMoSi2 based composites represent an important new class of “high temperature structural silicides”, with significant potential for elevated temperature structural applications in the range of 1200–1600 °C in oxidizing and aggressive environments. The properties of MoSi2 which make it an attractive matrix for high temperature composites are described and the developmental history of these materials traced. Latest results on elevated temperature creep resistance, low temperature fracture toughness, and composite oxidation behavior are summarized. Important avenues for future MoSi2 based composite development are suggested.

The Possibility of Cr-Base Alloys for High-Temperature Applications

2005 ◽  
Vol 475-479 ◽  
pp. 627-630 ◽  
Author(s):  
Yue Feng Gu ◽  
Y. Ro ◽  
Hiroshi Harada
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Ambient Temperature ◽  
Base Alloy ◽  
Structural Materials ◽  
Scattered Data ◽  
Temperature Analysis ◽  
Materials Used ◽  
High Possibility ◽  
Temperature Applications

The mechanical properties of chromium (Cr) and Cr-base alloys are reviewed, with particular emphasis on the ductility at ambient temperature and the strengths at high temperature. Analysis of rather scattered data and our recent results suggest that Cr-base alloy can be ductilized greatly at ambient temperature and is quite capable of being strengthened to high levels at high temperature. New designs on composition would give high possibility to Cr-base alloys as structural materials used in high-temperature applications.

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