Effects of Si, W and W–Mo on isothermal oxidation behaviors of Nb/Nb5Si3 in situ composites at high temperature

2009 ◽  
Vol 486 (1-2) ◽  
pp. 330-334 ◽  
Author(s):  
Bowen Xiong ◽  
Changchun Cai ◽  
Hong Wan ◽  
Yuhui Zheng
Keyword(s):  
High Temperature ◽  
Isothermal Oxidation ◽  
In Situ Composites ◽  
Oxidation Behaviors

Processing high-temperature refractory-metal silicide in-situ composites

JOM ◽  
1999 ◽  
Vol 51 (4) ◽  
pp. 32-36 ◽  
Author(s):  
B. P. Bewlay ◽  
M. R. Jackson ◽  
P. R. Subramanian
Keyword(s):  
High Temperature ◽  
Refractory Metal ◽  
Metal Silicide ◽  
In Situ Composites

scholarly journals Nanoscaled eutectic NiAl-(Cr,Mo) composites with exceptional mechanical properties processed by electron beam melting

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Andreas Förner ◽  
S. Giese ◽  
C. Arnold ◽  
P. Felfer ◽  
C. Körner ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Temperature ◽  
Electron Beam Melting ◽  
Lamellar Microstructure ◽  
High Hardness ◽  
Additive Process ◽  
In Situ Composites ◽  
Selective Electron Beam Melting ◽  
Very High

Abstract Eutectic NiAl-(Cr,Mo) composites are promising high temperature materials due to their high melting point, excellent oxidation behavior and low density. To enhance the strength, hardness and fracture toughness, high cooling rates are beneficial to obtain a fine cellular-lamellar microstructure. This can be provided by the additive process of selective electron beam melting. The very high temperature gradient achieved in this process leads to the formation of the finest microstructure that has ever been reported for NiAl-(Cr,Mo) in-situ composites. A very high hardness and fracture toughening mechanisms were observed. This represents a feasibility study towards additive manufacturing of eutectic NiAl-(Cr,Mo) in-situ composites by selective electron beam melting.

Creep Mechanisms in High-Temperature In-Situ Composites

1999 ◽  
Author(s):  
Bernard P. Bewlay ◽  
Melvin R. Jackson ◽  
Clyde L. Briant
Keyword(s):  
High Temperature ◽  
In Situ Composites ◽  
Creep Mechanisms

Experimental study and modeling of high temperature oxidation of Nb-base in situ composites

2009 ◽  
Vol 51 (2) ◽  
pp. 364-370 ◽  
Author(s):  
Dengzun Yao ◽  
Rui Cai ◽  
Chungen Zhou ◽  
Jiangbo Sha ◽  
Huiren Jiang
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
In Situ Composites

Microstructural Response of DS Nb-Silicide In-Situ Composites During High-Temperature Creep Testing

2000 ◽  
Vol 6 (S2) ◽  
pp. 376-377
Author(s):  
B.P. Bewlay ◽  
S.D. Sitzman
Keyword(s):  
High Temperature ◽  
Electron Backscatter Diffraction ◽  
Czochralski Method ◽  
Longitudinal Section ◽  
Creep Testing ◽  
Directionally Solidified ◽  
Creep Tests ◽  
In Situ Composites ◽  
Structural Applications

Directionally solidified (DS) in-situ composites based on (Nb) and Nb silicides, such as Nb5Si3 and Nb3Si, are being investigated for high-temperature structural applications. The use of alloying additions, such as Hf, Ti and Mo, to these silicides is required to enhance their properties. The present paper describes the microstructural response of a DS Nb-silicide based composite to creep testing.The composites investigated were directionally solidified from a molten alloy using the Czochralski method as described previously. Creep tests were conducted at 1200°C to strains of up 50%. Microstructure and microtexture characterizations were performed using scanning electron microscopy, electron microprobe analysis (EMPA), and electron backscatter diffraction pattern analysis (EBSP).Microstructures of the longitudinal section of a DS composite generated from a Nb-12.5Hf-33Ti- 16Si alloy are shown in Figure 1 in the as-DS (left hand side) and the DS+creep tested conditions (right hand side).

scholarly journals Synthesis and high temperature oxidation of Mo-Si-B-O pseudo in situ composites

2002 ◽  
Vol 3 (2) ◽  
pp. 181-192 ◽  
Author(s):  
Kyosuke Yoshimi ◽  
Shinya Nakatani ◽  
Shuji Hanada ◽  
Se-Hyun Ko ◽  
Yong-Ho Park
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
In Situ Composites

The High Temperature Oxidation Behavior of Hot-Dipping Al Coating on 0Cr18Ni10Ti Stainless Steel

2014 ◽  
Vol 905 ◽  
pp. 123-127 ◽  
Author(s):  
Jin Lou ◽  
Jie Ke Wang ◽  
Yu Bin Wang
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Cyclic Oxidation ◽  
Isothermal Oxidation ◽  
Aluminum Coating ◽  
Diffusion Annealing ◽  
Temperature Oxidation ◽  
Aluminized Steel ◽  
Oxidation Behaviors

0Cr18Ni10Ti stainless steel was coated by hot-dipping in a molten aluminum bath, and then diffusing annealing at 950°C for 2h. The high temperature isothermal oxidation behaviors of the hot-dipped aluminized steel and 0Cr18Ni10Ti steel were tested at 900 °C for 24h using Thermo gravimetric analyzer. The high temperature cyclic oxidation behaviors of the hot-dipped aluminized steel and 0Cr18Ni10Ti steel were tested at 900 °C for 24h using resistance furnace. The morphology was studied by SEM, the phase composition was characterized by EDS. The result of high temperature isothermal and cyclic oxidation test showed that the hot-dipped aluminum can dramatically improve the isothermal and cyclic oxidation of the 0Cr18Ni10Ti steel. The hot-dipping aluminum coating is consists of an outer layer of FeAl and an inner Iron solid solution with aluminum, after diffusion annealing at 950°C for 2 h. The Al2O3 oxide layer was formed on the hot-dipped aluminum coating during isothermal and cyclic oxidation process, which provides an additional protection for the steel from high temperature oxidation.

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