Structural and phase transformations in a carbide-strengthened alloy based on Ni3Al at high temperatures

1987 ◽  
Vol 30 (3) ◽  
pp. 228-231
Author(s):  
M. K. Kasymov ◽  
Yu. R. Kolobov ◽  
A. D. Korotaev ◽  
N. I. Afanas'ev ◽  
V. P. Buntushkin ◽  
...  
Keyword(s):  
Phase Transformations ◽  
High Temperatures ◽  
Structural And Phase Transformations

Causes of residual stresses during machining of workpiece surfaces

2020 ◽  
pp. 33-38
Author(s):  
L.V. Savelieva ◽  
A. A. Chudina
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Phase Transformations ◽  
High Temperatures ◽  
Plastic Deformations ◽  
Structural And Phase Transformations ◽  
Factors Influencing ◽  
Cutting Zone ◽  
The Moment

The basic data about residual stresses are considered, and the classification of residual stresses that occur in the surface layer of parts is provided. At the moment, it is customary to divide residual stresses by the volume of balancing into macro-stresses, micro-stresses and submicron stresses, and by the sign — compressive and tensile. The main causes of residual stresses are analyzed, and the factors influencing their occurrence are identified. There are three main causes of residual stresses: uneven plastic deformations in the cutting zone, as a result of the force of the tool on the workpiece, high temperatures accompanying the cutting process, and structural and phase transformations occurring on the surface of the workpiece.

The Complex Oxidation Behavior of Pd Combustion Catalysts

2001 ◽  
Vol 7 (S2) ◽  
pp. 1064-1065
Author(s):  
K. Lester ◽  
A.K. Datye
Keyword(s):  
Phase Transformations ◽  
High Temperatures ◽  
Catalytic Combustion ◽  
Catalyst Activity ◽  
Combustion Process ◽  
Reaction Rates ◽  
Stable Operation ◽  
Temperature Combustion ◽  
High Temperature Combustion ◽  
Complex Oxidation

Combustion of natural gas for power generation leads to NOx formation due to the high temperatures encountered. Catalytic combustion allows the entire combustion process to be completed at temperatures where NOx formation can be avoided. The catalyst of choice is supported PdO. As temperature is increased, PdO decomposes to Pd metal with profound effects on catalyst reactivity. Persistent hysteresis in reaction rates have been related to the decomposition of PdO into Pd and its reformation.Understanding and controlling the phase transformations, and the resulting activity variations, is of enormous importance for high temperature combustion catalysts where predictable catalyst activity is necessary for stable operation. Farrauto et al. studied the phase transformations of PdO to Pd using thermogravimetric analysis (TGA). They concluded that while PdO decomposes to Pd at high temperatures during the heating cycle, upon cooling the Pd does not transform to PdO till the temperature drops by several hundred degrees.

Structural and phase transformations occurring in sintered titanium materials during friction

1982 ◽  
Vol 21 (5) ◽  
pp. 401-404
Author(s):  
I. D. Radomysel'skii ◽  
V. N. Klimenko ◽  
A. M. Petrova ◽  
A. A. Mamonova ◽  
V. T. Varchenko
Keyword(s):  
Phase Transformations ◽  
Sintered Titanium ◽  
Structural And Phase Transformations

Structural and phase transformations in titanium alloyed with chromium and molybdenum atoms under the action of compression plasma flows

2010 ◽  
Vol 1 (4) ◽  
pp. 279-286 ◽  
Author(s):  
V. V. Uglov ◽  
N. N. Cherenda ◽  
V. I. Shimanski ◽  
N. V. Shostak ◽  
V. M. Astashinskii ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Plasma Flows ◽  
Structural And Phase Transformations ◽  
Compression Plasma Flows
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