scholarly journals The investigation of primary creep regeneration for 10%Cr martensitic steel: Unified constitutive modelling

2021 ◽  
Vol 190 ◽  
pp. 106044
Author(s):  
X. Li ◽  
S.R. Holdsworth ◽  
E. Mazza ◽  
E. Hosseini
Keyword(s):  
Martensitic Steel ◽  
Primary Creep ◽  
Constitutive Modelling

Investigation of Tensile and Compressive Creep Behaviour of AA2050-T34 during Creep Age Forming Process

2016 ◽  
Vol 716 ◽  
pp. 323-330 ◽  
Author(s):  
Yong Li ◽  
Zhusheng Shi ◽  
Yo Lun Yang ◽  
Jian Guo Lin
Keyword(s):  
Power Law ◽  
Creep Behaviour ◽  
Primary Creep ◽  
Constitutive Modelling ◽  
Ageing Process ◽  
Forming Process ◽  
Creep Equation ◽  
Compressive Creep ◽  
Creep Stress ◽  
Creep Age Forming

The tensile and compressive creep behaviour of aluminium alloy 2050 with T34 initial temper (AA2050-T34) during creep-ageing process has been experimentally investigated and analysed in detail. Both tensile and compressive creep-ageing tests under various stress levels (ranging from 100 MPa to 187.5 MPa) have been carried out at a temperature of 155 °C for 18 hours. The results show that creep strains under tensile stresses are much larger than those under the same levels of compressive stresses and a new “double primary creep feature” with five-stage creep behaviour has been observed in the alloy during the creep-ageing tests. The conventional power-law creep equation was applied to analyse the new creep behaviour of the alloy at the steady-state creep stage. Furthermore, the power-law relationship between the applied stress and the corresponding creep strain rate was found to be effective in all creep-ageing stages of the alloy and was used for further analysis. These analyses indicate that the dislocation and diffusion mechanisms may both contribute to this new creep behaviour and may play different roles in different creep-ageing stages. Moreover, the evolution of the creep resistance or threshold creep stress of the alloy during the creep-ageing process was quantitatively investigated by the proposed relationship. These results help to not only understand the new creep behaviour of AA2050-T34 during the creep-ageing process, but also facilitate further constitutive modelling of this new creep behaviour for its creep age forming applications.

scholarly journals Primary creep regeneration in 10%Cr martensitic steel: In-situ and ex-situ microstructure studies

2021 ◽  
Vol 199 ◽  
pp. 109405
Author(s):  
X. Li ◽  
S.R. Holdsworth ◽  
S. Kalácska ◽  
L. Balogh ◽  
J.-S. Park ◽  
...  
Keyword(s):  
Martensitic Steel ◽  
Primary Creep ◽  
Ex Situ

TEM of grain growth and phase transformations during creep of SCS-6 silicon carbide fibers

1995 ◽  
Vol 53 ◽  
pp. 350-351
Author(s):  
L. A. Giannuzzi ◽  
C. A. Lewinsohn ◽  
C. E. Bakis ◽  
R. E. Tressler
Keyword(s):  
Silicon Carbide ◽  
Creep Rate ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Primary Creep ◽  
Excess Carbon ◽  
Silicon Carbide Fibers ◽  
Sic Fiber ◽  
Carbon Core ◽  
Grain Width

The SCS-6 SiC fiber is a 142 μm diameter fiber consisting of four distinct regions of βSiC. These SiC regions vary in excess carbon content ranging from 10 a/o down to 5 a/o in the SiC1 through SiC3 region. The SiC4 region is stoichiometric. The SiC sub-grains in all regions grow radially outward from the carbon core of the fiber during the chemical vapor deposition processing of these fibers. In general, the sub-grain width changes from 50nm to 250nm while maintaining an aspect ratio of ~10:1 from the SiC1 through the SiC4 regions. In addition, the SiC shows a <110> texture, i.e., the {111} planes lie ±15° along the fiber axes. Previous has shown that the SCS-6 fiber (as well as the SCS-9 and the developmental SCS-50 μm fiber) undergoes primary creep (i.e., the creep rate constantly decreases as a function of time) throughout the lifetime of the creep test.

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