Microstructure of second-phase particles in high-temperature Ti-55 alloy after creep

1996 ◽  
Vol 37 (4) ◽  
pp. 183-186 ◽  
Author(s):  
G.P. Li ◽  
D. Li ◽  
Y.Y. Liu ◽  
S.X. Guan ◽  
Q.J. Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Second Phase ◽  
Second Phase Particles

scholarly journals Dissolution of Intermetallic Second-Phase Particles in Zircaloy-2 in High-Temperature Steam

2019 ◽  
Vol 50 (4) ◽  
pp. 1851-1861
Author(s):  
Weicheng Zhong ◽  
Xiang Liu ◽  
Peter A. Mouche ◽  
Jun-Li Lin ◽  
Donghee Park ◽  
...  
Keyword(s):  
High Temperature ◽  
Second Phase ◽  
Second Phase Particles ◽  
High Temperature Steam

Corrosion Product Films Formed on Aluminum In High Temperature Wester

CORROSION ◽  
1961 ◽  
Vol 17 (4) ◽  
pp. 181t-184t ◽  
Author(s):  
D. F. MacLENNAN
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Aluminum Alloys ◽  
Corrosion Product ◽  
High Purity ◽  
Second Phase ◽  
Corrosion Product Film ◽  
Second Phase Particles ◽  
Product Film

Abstract A study was made of the behavior of aluminum alloys exposed to 300 G high purity water for short periods of time. The corrosion products formed were examined by means of optical and electron microscopy. Results show that corrosion resistance is associated with the distribution of second phase particles in the alloys. The alloy, which had the best corrosion resistance, contained the most uniform distribution of cathodic second phase particles; the corrosion product film of this alloy contained a corresponding distribution of irregularities. It is suggested that the second phase particles modify the film in such a way as to increase its protective qualities. 6.4.2, 4.6.5, 3.2.3

The Effect of Grain-Boundary and Matrix Precipitates on High Temperature Strength in Fe3Al Based Alloys

2011 ◽  
Vol 1295 ◽  
Author(s):  
Ryo Makihara ◽  
Satoru Kobayashi ◽  
Takayuki Takasugi
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Tensile Tests ◽  
High Temperature Strength ◽  
Second Phase ◽  
Proof Stress ◽  
Second Phase Particles ◽  
The Matrix

ABSTRACTThe effect of grain boundary (GB) and matrix precipitates on high temperature strength was investigated in Fe3Al base alloys containing Cr, Mo and C. Tensile tests were conducted at 600°C for three types of microstructures consisting of: (I) film-like κ phase precipitates covering GBs and fine M2C particles in the matrix, (II) only fine M2C particles in the matrix and (III) no second-phase particles in the matrix. It was found that κ films on GBs are more than twice as effective as finely dispersed M2C particles for improving the proof stress.

Effect of Nanocalcium Oxide Addition on the Cast Microstructure of Pipeline Steel

2013 ◽  
Vol 380-384 ◽  
pp. 4241-4244
Author(s):  
Jian Ming Wang ◽  
Yan Liu ◽  
Long Xian Ding ◽  
Chun Lin He
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Grain Boundary ◽  
Pipeline Steel ◽  
Granular Bainite ◽  
Second Phase ◽  
X80 Pipeline Steel ◽  
Oxide Addition ◽  
Second Phase Particles ◽  
Cast Microstructure

This experiment takes the X80 pipeline steel as the research object, the thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding nanocalcium oxide into the steel with the method of carrier dispersion addition. The effect of nanocalcium oxide addition on the cast microstructure of X80 pipeline steel was analysed. The results show that the cast microstructure is consist of the ferrite and a small amount bainite. And the bainite is distributed at the boundary of the ferrite grains. When adding 0.02 wt% nanocalcium oxides, there is more bainite in the microstructure by contrast. The number of the acicular ferrite significantly increases in the cast microstructure, and the grains become more fine and uniform. Simultaneously, the granular bainite is uniformly distributed at the grain boundary and edge of the ferrite.

Effects of Trace ZrC on the Microstructure and Properties of Molybdenum Alloy

2013 ◽  
Vol 785-786 ◽  
pp. 76-80
Author(s):  
Hui Chao Cheng ◽  
Jing Lian Fan ◽  
Zhao Qian ◽  
Jia Min Tian
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Room Temperature ◽  
Tensile Fracture ◽  
Second Phase ◽  
Powder Metallurgy Method ◽  
Microstructure And Properties ◽  
Dimple Fracture ◽  
Second Phase Particles ◽  
Zr Alloy

The present study describes the effect of trace ZrC additive on the microstructure and properties of Mo-Ti-Zr alloy fabricated by powder metallurgy method. The results indicate that, ZrC addition effectively enhanced the tensile strength of the alloy both at room-temperature and high-temperature, the alloy with 0.4wt% ZrC has the highest tensile strength, which is 611MPa and 513MPa at 25°C and 800°C, respectively. The tensile fracture mainly consists of intergranular rupture at room temperature, while dimple fracture occurred at high temperature, which indicating higher elongation. Through observation from the micrograph and EDS analysis, ZrxOyCz second-phase particles were observed,which is derived from part of ZrC particles reacted with the oxygen and can suppress the oxygen segregation on grain boundary.

Effect of the Service Temperature on the Strength Plasticity and Fracture Mechanism of Cr-Mo Casing Steel

2021 ◽  
Vol 1035 ◽  
pp. 350-357
Author(s):  
Wen Lan Wei ◽  
Yin Ping Cao ◽  
Lu Cui ◽  
Jia Rui Cheng ◽  
Ze Bing Wei ◽  
...  
Keyword(s):  
High Temperature ◽  
Fracture Mechanism ◽  
Oil And Gas ◽  
Steel Grade ◽  
Second Phase ◽  
Strain Design ◽  
Second Phase Particles ◽  
Service Load ◽  
Steel Grades ◽  
Strength And Plasticity

In recent years, the oil and gas well casing is confronted with more complex service environment, and the casing is subjected to higher service load and temperature. In this study, the strength and plasticity of Cr - Mo low alloy casing steel of 80, 90 and 110 steel grades commonly used under high temperature service conditions was studied. The results show that with the increase of temperature, the yield strength and tensile strength of casing steel decreased. The sensitivity of high steel grade to temperature change was higher than that of lower steel grade; with the increase of steel grade, the fracture mechanism of casing steel changed from microporous polymerization fracture induced by large size second phase particles to shear propagation fracture induced by sub grain boundary microporous polymerization. This study has important guiding significance for the service safety and strain design of high grade steel under high temperature conditions.

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