Specific characteristics of high-temperature creep of two-phase alloys

1968 ◽  
Vol 11 (11) ◽  
pp. 147-149
Author(s):  
K. K. Ziling ◽  
A. I. Grankin
Keyword(s):  
High Temperature ◽  
High Temperature Creep ◽  
Two Phase ◽  
Temperature Creep

High Temperature Creep Behavior of Single Crystal Gammpraime and Gamm Laloys

1988 ◽  
Vol 133 ◽  
Author(s):  
M. V. Nathal ◽  
J. O. Diaz ◽  
R. V. Miner
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Creep Behavior ◽  
Dislocation Motion ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
High Temperature Creep ◽  
Two Phase ◽  
Temperature Creep

ABSTRACTThe creep behavior of single crystals of γ′ and γ alloys were investigated and compared to the response of two phase superalloys tested previously. High temperature deformation in the γ alloys was characteristic of a climb controlled mechanism, whereas the γ′ based materials exhibited glide controlled creep behavior. The superalloys were much more creep resistant than their constituent phases, which indicates the importance of the γ-γ′ interface as a barrier for dislocation motion during creep.

Microstructural development of SCS-6 SiC fibers during high temperature creep

1998 ◽  
Vol 13 (7) ◽  
pp. 1853-1860 ◽  
Author(s):  
Lucille A. Giannuzzi ◽  
Charles A. Lewinsohn ◽  
Charles E. Bakis ◽  
Richard E. Tressler
Keyword(s):  
High Temperature ◽  
Grain Growth ◽  
Creep Deformation ◽  
Phase Region ◽  
Microstructural Development ◽  
High Temperature Creep ◽  
Two Phase ◽  
Excess Carbon ◽  
Sic Fibers ◽  
Temperature Creep

Microstructural development of SCS-6 SiC fibers induced by creep deformation at 1400 °C is presented. Grain growth occurs in all SiC regions of the fiber during creep. Portions of the SiC4 region transform from βSiC to αSiC growing at the expense of the βSiC. The SiC1 through SiC3 regions of the fiber consist of a distinct (C + βSiC) two-phase region. The grain growth of the βSiC grains in the two-phase region is not as extensive as in the SiC4 region, suggesting that the presence of excess carbon may inhibit the growth of βSiC.

scholarly journals On the Plastic Strain Accumulation in Notched Bars During High-Temperature Creep Dwell

2020 ◽  
Vol 36 (2) ◽  
pp. 167-176 ◽  
Author(s):  
Daniele Barbera ◽  
Haofeng Chen
Keyword(s):  
High Temperature ◽  
Cyclic Loading ◽  
Plastic Strain ◽  
Kinematic Hardening ◽  
High Temperature Creep ◽  
Strain Accumulation ◽  
Material Models ◽  
Cyclic Loading Condition ◽  
Hardening Material ◽  
Temperature Creep

ABSTRACTStructural integrity plays an important role in any industrial activity, due to its capability of assessing complex systems against sudden and unpredicted failures. The work here presented investigates an unexpected new mechanism occurring in structures subjected to monotonic and cyclic loading at high temperature creep condition. An unexpected accumulation of plastic strain is observed to occur, within the high-temperature creep dwell. This phenomenon has been observed during several full inelastic finite element analyses. In order to understand which parameters make possible such behaviour, an extensive numerical study has been undertaken on two different notched bars. The notched bar has been selected due to its capability of representing a multiaxial stress state, which is a practical situation in real components. Two numerical examples consisting of an axisymmetric v-notch bar and a semi-circular notched bar are considered, in order to investigate different notches severity. Two material models have been considered for the plastic response, which is modelled by both Elastic-Perfectly Plastic and Armstrong-Frederick kinematic hardening material models. The high-temperature creep behaviour is introduced using the time hardening law. To study the problem several results are presented, as the effect of the material model on the plastic strain accumulation, the effect of the notch severity and the mesh element type and sensitivity. All the findings further confirm that the phenomenon observed is not an artefact but a real mechanism, which needs to be considered when assessing off-design condition. Moreover, it might be extremely dangerous if the cyclic loading condition occurs at such a high loading level.

Investigation of High-Temperature Creep in Mullite – Zirconium Oxide Polydisperse Ceramic

2014 ◽  
Vol 71 (5-6) ◽  
pp. 175-179
Author(s):  
V. G. Maksimov ◽  
D. V. Grashchenkov ◽  
V. A. Lomovskoi ◽  
V. G. Babashov ◽  
O. V. Basargin ◽  
...  
Keyword(s):  
High Temperature ◽  
Zirconium Oxide ◽  
High Temperature Creep ◽  
Temperature Creep
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