Deformation and long-term damage of fibrous materials with the stress-rupture microstrength of the matrix described by a fractional-power function

2009 ◽  
Vol 45 (11) ◽  
pp. 1196-1205 ◽  
Author(s):  
L. P. Khoroshun ◽  
E. N. Shikula
Keyword(s):  
Power Function ◽  
Fractional Power ◽  
Stress Rupture ◽  
Fibrous Materials ◽  
The Matrix

Effects of Long-Term Aging Treatment on Stress Rupture Properties of FGH95 Ni-Base Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 684-689
Author(s):  
Su Gui Tian ◽  
Guang Liang Xie ◽  
Jun Xie ◽  
Xiao Ming Zhou
Keyword(s):  
Stress Rupture ◽  
Aging Treatment ◽  
Stress Rupture Property ◽  
Microstructure Observation ◽  
Partial Dislocations ◽  
Stress Rupture Properties ◽  
The Matrix ◽  
Deformation Features ◽  
Rupture Properties

The effect of long-term aging on stress rupture properties was investigated by means of microstructure observation and properties measurement. The results showed that, after long-term aging for 500 h at 723 K, the coarser particle-like γ phase was precipitated along the grain boundaries of alloy, significant amount of γ particles were regularly distributed within the grain. Moreover, some carbide particles precipitated depressively along the boundaries and within the grain. As the aged time and temperature increased, the size of fine γ particles in the alloy increased slightly, and the stress rupture property of the alloy decreased under the condition of 923K and 1034MPa. The deformation features of the alloy during creep were that the dislocations slip in the matrix or shear into the γ phase, the dislocations shearing into the γ phase may be decomposed to form the configuration of the two partial-dislocations plus stacking fault. As the creep went on, the slipping traces with different orientations appeared in the surface of the specimen, and some slipping steps were formed in the region near the boundaries, which may cause the stress concentration to promote the initiation and propagation of the cracks along the boundaries up to creep fracture.

Effects of Long-Term Aging Treatment on Stress Rupture Properties of FGH95 Ni-Base Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 678-683
Author(s):  
Su Gui Tian ◽  
Guang Liang Xie ◽  
Jun Xie ◽  
Xiao Ming Zhou
Keyword(s):  
Stress Rupture ◽  
Aging Treatment ◽  
Stress Rupture Property ◽  
Microstructure Observation ◽  
Partial Dislocations ◽  
Stress Rupture Properties ◽  
The Matrix ◽  
Deformation Features ◽  
Rupture Properties

The effect of long-term aging on stress rupture properties was investigated by means of microstructure observation and properties measurement. The results show that, after long-term aging for 500 h at 723 K, the coarser particle-like γ phase is precipitated along the grain boundaries of alloy, significant amount of γ particles are regularly distributed within the grain. Moreover, some carbide particles precipitated depressively along the boundaries and within the grain. As the aged time and temperature increase, the size of fine γ particles in the alloy increases slightly, and the stress rupture property of the alloy decreases under the condition of 923K and 1034MPa. The deformation features of the alloy during creep are that the dislocations slip in the matrix or shear into the γ phase, the dislocations shearing into the γ phase may be decomposed to form the configuration of the two partial-dislocations plus stacking fault. As the creep goes on, the slipping traces with different orientations appear in the surface of the specimen, and some slipping steps are formed in the region near the boundaries, which may cause the stress concentration to promote the initiation and propagation of the cracks along the boundaries up to creep fracture.

Prediction of Long Term Stress Rupture Data for 2124

2006 ◽  
Vol 519-521 ◽  
pp. 1041-1046 ◽  
Author(s):  
Brian Wilshire ◽  
H. Burt ◽  
N.P. Lavery
Keyword(s):  
Q Methodology ◽  
Fracture Behavior ◽  
Stress Rupture ◽  
Creep Data ◽  
Short Term ◽  
Rupture Data ◽  
Term Creep ◽  
Term Data ◽  
Short Term Creep

The standard power law approaches widely used to describe creep and creep fracture behavior have not led to theories capable of predicting long-term data. Similarly, traditional parametric methods for property rationalization also have limited predictive capabilities. In contrast, quantifying the shapes of short-term creep curves using the q methodology introduces several physically-meaningful procedures for creep data rationalization and prediction, which allow straightforward estimation of the 100,000 hour stress rupture values for the aluminum alloy, 2124.

The Relationship Between Magnetism and Microstructure of Ethylene Pyrolysis Furnace Tubes after a Long-term Service

2018 ◽  
Vol 24 (5) ◽  
pp. 478-487 ◽  
Author(s):  
Jingfeng Guo ◽  
Tieshan Cao ◽  
Congqian Cheng ◽  
Xianming Meng ◽  
Jie Zhao
Keyword(s):  
Saturation Magnetization ◽  
Outer Region ◽  
Cr Content ◽  
Pyrolysis Furnace ◽  
The Matrix ◽  
Furnace Tube ◽  
Primary Carbides ◽  
The Relationship ◽  
Very High

AbstractThe magnetism and microstructure of Cr25Ni35Nb and Cr35Ni45Nb alloy tubes after 5 years of service were investigated in this paper. The saturation magnetization of the Cr25Ni35Nb alloy tube in the thickness direction is more than 20 emu/g, and the tube becomes ferromagnetic. The inner and outer walls of Cr35Ni45Nb alloy tubes also become ferromagnetic. But the saturation magnetization of the Cr35Ni45Nb alloy tubes approaches to zero in the center zone. The primary carbides M7C3 and NbC are changed into M23C6 and G phase at the outer region of the furnace tube. However, the M23C6-type carbides were replaced by carbon-rich carbides M7C3 at the carburization zone. Cr-depleted zones are formed at the inner and outer walls of the furnace tubes owing to oxidation. Carburization and oxidation reduce the Cr content of the matrix. Accordingly, the saturation magnetization is very high at the carburization zone and Cr-depleted zone. The magnetism of Cr25Ni35Nb and Cr35Ni45Nb alloy tubes has a high correlation with the Cr content of the matrix. Carburization and oxidation are the main reasons that make the paramagnetic ethylene pyrolysis furnace tube change to ferromagnetic.

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