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.

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

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

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.

scholarly journals Mechanism Of Ductile Rupture In The AL/Sapphire System Elucidated Using X-Ray Tomographic Microscopy

1995 ◽  
Vol 409 ◽  
Author(s):  
Wayne E. King ◽  
Geoffrey H. Campbell ◽  
David L. Haupt ◽  
John H. Kinney ◽  
Robert A. Riddle ◽  
...  
Keyword(s):  
Void Growth ◽  
Fracture Mechanism ◽  
Crack Extension ◽  
Initial Crack ◽  
Fracture Mechanisms ◽  
Second Phase ◽  
Metal Foil ◽  
Ductile Rupture ◽  
X Ray ◽  
Second Phase Particles

AbstractThe fracture of a thin metal foil constrained between alumina or sapphire blocks has been studied by a number of investigators. The systems that have been investigated include Al [1,2], Au [3], Nb [4], and Cu [5]. Except for Al/ Al2O3 interfaces, these systems exhibit a common fracture mechanism: pores form at the metal/ceramic interface several foil thicknesses ahead of the crack which, under increasing load, grow and link with the initial crack. This mechanism leaves metal on one side of the fracture surface and clean ceramic on the other. This has not been the observation in Al/ A12O3 bonds where at appropriate thicknesses of Al, the fracture appears to proceed as a ductile rupture through the metal.The failure of sandwich geometry samples has been considered in several published models, e.g., [6,71. The predictions of these models depend on the micromechanic mechanism of crack extension. For example, Varias et al. proposed four possible fracture mechanisms: (i) near-tip void growth at second phase particles or interfacial pores and coalescence with the main crack, (ii) high-triaxiality cavitation, i.e., nucleation and rapid void growth at highly stressed sites at distances of several layer thicknesses from the crack tip, (iii) interfacial debonding at the site of highest normal interfacial traction, and (iv) cleavage fracture of the ceramic. Competition among the operative mechanisms determines which path will be favored.This paper addresses the question of why the fracture of the A1/A12O3 system appears to be different from other systems by probing the fracture mechanism using X-ray tomographic microscopy (XTM). We have experimentally duplicated the simplified geometry of the micromechanics models and subjected the specimens to a well defined stress state in bending. The bend tests were interrupted and XTM was performed to reveal the mechanism of crack extension.

The Mechanical Properties of the Mo-0.5Ti and Mo-0.1Zr Alloys at Room Temperature and High Temperature Annealing

2017 ◽  
Vol 36 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Chaopeng Cui ◽  
Yimin Gao ◽  
Shizhong Wei ◽  
Guoshang Zhang ◽  
Yucheng Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Alloy Element ◽  
Second Phase ◽  
High Temperature Annealing ◽  
Molybdenum Alloys ◽  
Second Phase Particles ◽  
Strength And Plasticity

AbstractMo-0.5Ti and Mo-0.1Zr alloys were prepared by powder metallurgy. In Mo-0.5Ti and Mo-0.1Zr alloys, there appears the second-phase particles of Ti2O3 and ZrO2 respectively, each of which can effectively prevent the dislocation activity in the process of plastic deformation. The addition of Zr can increase the strength of molybdenum alloys. Meanwhile, the ZrO2 formed from the alloy element Zr can refine the grains of molybdenum alloys to improve the recrystallization plasticity. After annealing, the tensile strength decreases while the plasticity greatly increases compared to the annealed Mo-0.5Ti and Mo-0.1Zr alloys. With the increase of annealing temperature, both the tensile strength and plasticity of Mo-0.5Ti and Mo-0.1Zr alloys decrease. Compared with pure Mo, after annealing the properties of the Mo-0.5Ti alloy and the plasticity of the Mo-0.1Zr alloy significantly increases.

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.

Sign in / Sign up

Export Citation Format

Share Document