2417 Study on Long-Term High Temperature Strength of High Cr Steel Welds : Part 6: Improvement of Type-IV Cracking Resistance of Materials

2007 ◽  
Vol 2007.1 (0) ◽  
pp. 409-410
Author(s):  
Masaaki TABUCHI ◽  
Hiromichi HONGO ◽  
Yukio TAKAHSHI
Keyword(s):  
High Temperature ◽  
High Temperature Strength ◽  
Cracking Resistance ◽  
Type Iv ◽  
Type Iv Cracking ◽  
Steel Welds

scholarly journals The Effect of Simultaneous Si and Ti/Mo Alloying on High-Temperature Strength of Fe3Al-Based Iron Aluminides

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4268
Author(s):  
Věra Vodičková ◽  
Martin Švec ◽  
Pavel Hanus ◽  
Pavel Novák ◽  
Antonín Záděra ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Yield Stress ◽  
Electron Backscatter Diffraction ◽  
Xrd Analysis ◽  
Iron Aluminides ◽  
High Temperature Strength ◽  
X Ray Diffraction ◽  
Backscatter Diffraction

The effect of phase composition and morphology on high-temperature strength in the compression of Fe-Al-Si-based iron aluminides manufactured by casting was investigated. The structure and high-temperature strength in the compression of three alloys—Fe28Al5Si, Fe28Al5Si2Mo, and Fe28Al5Si2Ti—were studied. Long-term (at 800 °C for 100 h) annealing was performed for the achievement of structural stability. The phase composition and grain size of alloys were primarily described by means of scanning electron microscopy equipped with energy dispersive analysis and Electron Backscatter Diffraction (EBSD). The phase composition was verified by X-ray diffraction (XRD) analysis. The effect of Mo and Ti addition as well as the effect of long-term annealing on high-temperature yield stress in compression were investigated. Both additives—Mo and Ti—affected the yield stress values positively. Long-term annealing of Fe28Al5Si-X iron aluminide alloyed with Mo and Ti deteriorates yield stress values slightly due to grain coarsening.

Application of MgO Concrete in China Dongfeng Arch Dam Foundation

2010 ◽  
Vol 168-170 ◽  
pp. 1953-1956 ◽  
Author(s):  
Chang Li Chen ◽  
Cheng Shu Tang ◽  
Zhen Hua Zhao
Keyword(s):  
High Temperature ◽  
Deformation Behavior ◽  
Arch Dam ◽  
Observation Data ◽  
Concrete Technology ◽  
Cracking Resistance ◽  
Dam Foundation ◽  
Stable Level ◽  
Mgo Concrete

In order to find out the long-term deformation behavior of MgO concrete,the nearly 10 years prototype observation data of Dongfeng arch dam foundation is analyzed. The results show that the MgO concrete has excellent delayed micro-expansion character, and its long-term expansive deformation always tends to stable level without any trend to contraction or infinite expansion, and by adding appropriate MgO expanding agent which was calcined at some high temperature into concrete, the cracking resistance of the concrete is improved. It is an effective way to construct dams excellently, efficiently and economically by using MgO concrete technology.

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