Thermal cycling creep properties of a directionally solidified superalloy DZ125

2022 ◽  
Vol 104 ◽  
pp. 269-284
Author(s):  
Wenrui An ◽  
Satoshi Utada ◽  
Xiaotong Guo ◽  
Stoichko Antonov ◽  
Weiwei Zheng ◽  
...  
Keyword(s):  
Thermal Cycling ◽  
Directionally Solidified ◽  
Creep Properties

Microstostructural Developments in Chill-Cast and Directionally Solidified Ti-44Al-11Nb Alloys

1999 ◽  
Vol 5 (S2) ◽  
pp. 866-867
Author(s):  
E.S.K. Menon ◽  
T.R. Halladay ◽  
A.G. Fox ◽  
R. Mahapatra
Keyword(s):  
Titanium Aluminides ◽  
Processing Parameters ◽  
Intermetallic Alloys ◽  
Directionally Solidified ◽  
Creep Properties ◽  
Good Oxidation Resistance ◽  
Recent Approach ◽  
Chill Cast ◽  
Processing Techniques ◽  
Fully Lamellar

Studies aimed at improvements in the properties of titanium aluminides continue and efforts on optimizing the microstuctural parameters and a variety of processing techniques have attracted significant attention. In particular alloy compositions containing Ti-44to48at%Al and Nb as the major ternary addition (often with other minor alloying element additions) have been found quite promising. A fine fully lamellar structure in these TiAl-based intermetallic alloys has been reported to possess a combination of improved room temperature ductility, excellent fracture toughness, good oxidation resistance and creep properties. One of the serious problems associated with the TiAl-based alloys is the large grain size that develops in these alloys especially upon casting. A recent approach is to use directional solidification techniques in producing the TiAlbased alloys and it has been shown that desired orientations can indeed be produced by choice of suitable processing parameters.In this study, we have examined the microstructural features associated with chill-cast as well as directionally solidified Ti-44at%Al-l lat%Nb alloy.

Microstructural Stability of Directionally Solidified Eutectic NiAl-Mo Under Static and Thermal Cycling Conditions

1996 ◽  
Vol 460 ◽  
Author(s):  
M. T. Kush ◽  
J. W. Holmes ◽  
R. Gibala
Keyword(s):  
Thermal Cycling ◽  
Microstructural Stability ◽  
Directionally Solidified ◽  
Argon Gas ◽  
Heating And Cooling ◽  
Annealing Conditions ◽  
Gas Atmosphere ◽  
Binary Eutectic ◽  
Temperature Heating ◽  
Large Shape

ABSTRACTThe quasi-binary eutectic NiAl-9% Mo with faceted molybdenum fibers was subjected to both thermal annealing conditions and to annealing under thermal cycling conditions to determine the microstructural stability of this alloy. The static temperature tests were run at 0.85TM - 0.97TM in an argon gas atmosphere. The thermal cycling tests were performed between temperatures of 700°C and 1200°C by induction heating disk-shaped specimens in an argon gas atmosphere using time-temperature heating and cooling profiles to approximate potential engine applications. To quantify microstructural changes, the fiber size and size distribution and number of fibers per unit area were measured as a function of time at temperature. The overall results demonstrate that the directionally solidified eutectic NiAl-9Mo subjected to thermal fatigue conditions exhibits cell boundary coarsening and large shape changes, whereas the microstructure under static stress-free annealing is stable.

Thermal cycling-induced distortion of a directionally solidified Al-Al3Ni eutectic composite

1977 ◽  
Vol 8 (12) ◽  
pp. 2028-2030 ◽  
Author(s):  
S. Yoda ◽  
Nóbuya Kurihara ◽  
K. Wakashima ◽  
S. Umekawa
Keyword(s):  
Thermal Cycling ◽  
Eutectic Composite ◽  
Directionally Solidified

Microstructure and creep properties of a near-eutectic directionally solidified multiphase Mo–Si–B alloy

2014 ◽  
Vol 48 ◽  
pp. 28-33 ◽  
Author(s):  
G. Hasemann ◽  
I. Bogomol ◽  
D. Schliephake ◽  
P.I. Loboda ◽  
M. Krüger
Keyword(s):  
Directionally Solidified ◽  
Creep Properties

High temperature creep properties of directionally solidified CM-247LC Ni-based superalloy

2016 ◽  
Vol 655 ◽  
pp. 237-243 ◽  
Author(s):  
Mau-Sheng Chiou ◽  
Sheng-Rui Jian ◽  
An-Chou Yeh ◽  
Chen-Ming Kuo ◽  
Jenh-Yih Juang
Keyword(s):  
High Temperature ◽  
High Temperature Creep ◽  
Directionally Solidified ◽  
Creep Properties ◽  
Temperature Creep

Effects of carbides and its evolution on creep properties of a directionally solidified nickel-based superalloy

2015 ◽  
Vol 633 ◽  
pp. 20-27 ◽  
Author(s):  
Qiuyang Li ◽  
Sugui Tian ◽  
Huichen Yu ◽  
Ning Tian ◽  
Yong Su ◽  
...  
Keyword(s):  
Directionally Solidified ◽  
Creep Properties ◽  
Nickel Based Superalloy

Microstructural Stability Of a NiAI-Mo Eutectic Alloy

1998 ◽  
Vol 552 ◽  
Author(s):  
M. T. Kush ◽  
J. W. Holmes ◽  
R. Gibala
Keyword(s):  
Thermal Cycling ◽  
Thermal Stresses ◽  
Boundary Region ◽  
Microstructural Stability ◽  
Directionally Solidified ◽  
Columnar Microstructure ◽  
Heating And Cooling ◽  
Cellular Microstructure ◽  
Temperature Heating ◽  
Specimen Shape

ABSTRACTThe microstructural stability of a directionally-solidified NiA1–9 at.% Mo quasi-binary alloy was investigated under conditions of thermal cycling between the temperatures 973 K and 1473 K utilizing time-temperature heating and cooling profiles which approximate potential engine applications. Two different microstructures were examined: a cellular microstructure in which the faceted secondphase Mo rods in the NiAl matrix formed misaligned cell boundaries which separated aligned cells approximately 0.4 mm in width and 5–25 mm in length, and a nearly fault-free fully columnar microstructure well aligned along the [001] direction. Both microstructures resisted coarsening under thermal cycling, but plastic deformation induced by thermal stresses introduced significant specimen shape changes. Surprisingly, the cellular microstructure, for which the cell boundary region apparently acts as a deformation buffer, exhibited better resistance to thermal fatigue than the more fault-free and better aligned columnar microstructure.

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