scholarly journals Study on Characterization of Compressive and Tensile Creep Behavior for Early Aged Concrete.

1998 ◽  
pp. 105-117
Author(s):  
Keishiro Iriya ◽  
Tatsuya Hattori ◽  
Hidetaka Umehara
Keyword(s):  
Creep Behavior ◽  
Tensile Creep

Characterization of the Microstructure, Tensile and Creep Behavior of Powder Metallurgy Processed and Rolled Ti-6Al-4V-1B Alloy

2010 ◽  
Vol 436 ◽  
pp. 195-203 ◽  
Author(s):  
Wei Chen ◽  
Carl J. Boehlert
Keyword(s):  
Elevated Temperature ◽  
Powder Metallurgy ◽  
Creep Behavior ◽  
Creep Deformation ◽  
Deformation Behavior ◽  
Creep Resistance ◽  
Tensile Creep ◽  
Duplex Microstructure ◽  
Α Phase

This work investigated the microstructure and elevated-temperature (400-475oC) tensile and tensile-creep deformation behavior of a powder metallurgy (PM) rolled Ti-6Al-4V-1B(wt.%) alloy. The PM rolled Ti-6Al-4V-1B alloy exhibited a duplex microstructure, and it did not exhibit a strong α-phase texture compared with the PM extruded Ti-6Al-4V-1B alloy. The PM rolled Ti-6Al-4V-1B alloy exhibited greater creep resistance than the PM extruded Ti-6Al-4V-1B alloy as well as the as-cast Ti-6Al-4V-1B alloy.

Microstructure and tensile creep behavior of Mg–4Al based magnesium alloys with alkaline-earth elements Sr and Ca additions

2006 ◽  
Vol 419 (1-2) ◽  
pp. 181-188 ◽  
Author(s):  
Bai Jing ◽  
Sun Yangshan ◽  
Xun Shan ◽  
Xue Feng ◽  
Zhu Tianbai
Keyword(s):  
Magnesium Alloys ◽  
Creep Behavior ◽  
Alkaline Earth ◽  
Tensile Creep ◽  
Alkaline Earth Elements

scholarly journals Study on Tensile Creep Behavior of 12Cr1MoV Alloy Steel under High-Temperature Alkali Metal Salt Environment for Solar Thermal Power Generation

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Jianjun He ◽  
Kaijun Yang ◽  
Gang Wang ◽  
Wei Li ◽  
Jiangyong Bao ◽  
...  
Keyword(s):  
High Temperature ◽  
Alkali Metal ◽  
Creep Behavior ◽  
Metal Salt ◽  
Thermal Power ◽  
Alkali Metal Salt ◽  
Tensile Creep ◽  
Mixed Salt ◽  
Solar Thermal Power ◽  
Solar Thermal Power Generation

The heat exchange tubes of solar thermal power generation work in molten salt environment with periodic temperature change. In order to reveal the tensile creep behavior of 12Cr1MoV pipeline steel under high-temperature alkali metal salt environment, the tensile creep behavior of 12Cr1MoV alloy under different applied load and reaction temperature in high-temperature alkali metal chloride salt environment was studied. The results show that the deformation of 12Cr1MoV alloy in 600°C, NaCl-35%KCl mixed salt environment is mainly controlled by diffusion creep; with the increase of stress, the creep life of 12Cr1MoV alloy decreases. The creep fracture mechanism of 12Cr1MoV alloy in 600°C, NaCl-35%KCl mixed salt environment is intergranular ductile fracture; the increase of temperature will enhance the activation and oxidation of the chlorine atoms, thereby accelerating the corrosion of the base metal and increasing the spheroidization speed of the pearlite matrix, and the creep deformation rate of the alloy increases with increasing temperature.

The Microstructure and Creep Behavior of Cold Rolled Udimet 188 Sheet

2010 ◽  
Vol 17 (3) ◽  
pp. 350-361
Author(s):  
C.J. Boehlert ◽  
S.C. Longanbach
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Creep Behavior ◽  
Volume Fraction ◽  
Solution Treatment ◽  
Tensile Creep ◽  
Dislocation Creep ◽  
Grain Boundary Character Distribution ◽  
Air Cooling ◽  
Cold Rolled

AbstractUdimet 188 was subjected to thermomechanical processing (TMP) in an attempt to understand the effects of cold-rolling deformation on the microstructure and tensile-creep behavior. Commercially available sheet was cold rolled to varying amounts of deformation (between 5–35% reduction in sheet thickness) followed by a solution treatment at 1,464 K (1,191°C) for 1 h and subsequent air cooling. This sequence was repeated four times to induce a high-volume fraction of low-energy grain boundaries. The resultant microstructure was characterized using electron backscattered diffraction. The effect of the TMP treatment on the high-temperature [1,033–1,088 K (760–815°C)] creep behavior was evaluated. The measured creep stress exponents (6.0–6.8) suggested that dislocation creep was dominant at 1,033 K (760°C) for stresses ranging between 100–220 MPa. For stresses ranging between 25–100 MPa at 1,033 K (760°C), the stress exponents (2.3–2.8) suggested grain boundary sliding was dominant. A significant amount of grain boundary cracking was observed both on the surface and subsurface of deformed samples. To assess the mechanisms of crack nucleation, in situ scanning electron microscopy was performed during the elevated-temperature tensile-creep deformation. Cracking occurred preferentially along general high-angle grain boundaries (GHAB) and less than 25% of the cracks were found on low-angle grain boundaries (LAB) and coincident site lattice boundaries (CSLB). Creep rupture experiments were performed at T = 1,088 K (815°C) and σ = 165 MPa and the greatest average time-to-rupture was exhibited by the TMP sheet with the greatest fraction of LAB+CSLB. However, a clear correlation was not exhibited between the grain boundary character distribution and the minimum creep rates. The findings of this work suggest that although grain boundary engineering may be possible for this alloy, simply relating the fraction of grain boundary types to the creep resistance is not sufficient.

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