Influence of Tempering Temperature on the Second Phase Precipitation and Properties of X60 Pipeline Steel

2015 ◽  
pp. 737-742
Author(s):  
Zailong Liu ◽  
Yuxiu Bian ◽  
Yanfeng Zhao
Keyword(s):  
Pipeline Steel ◽  
Second Phase ◽  
Phase Precipitation ◽  
Tempering Temperature

Effect of Nanometer Magnesium Oxide Addition on the Cast Microstructure of X80 Pipeline Steel

2013 ◽  
Vol 401-403 ◽  
pp. 610-613
Author(s):  
Jian Ming Wang ◽  
Yang Liu ◽  
Yan Liu ◽  
Qian He Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Magnesium Oxide ◽  
Pipeline Steel ◽  
Harsh Environment ◽  
Second Phase ◽  
X80 Pipeline Steel ◽  
Oxide Addition ◽  
Second Phase Particles ◽  
Cast Microstructure

The pipeline steel as an application in pipeline construction must have good comprehensive mechanical properties due to the harsh environment of the pipeline engineering. So 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 nanomagnesium oxide into the steel with the method of carrier dispersion addition. The effect of nanometer magnesium 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% nanometer magnesium oxides, the number of bainite increases significantly in the cast microstructure, which is mostly distributed at the boundary of the ferrite grains.

scholarly journals Effect of Tempering Temperature after Thermo-Mechanical Control Process on Microstructure Characteristics and Hydrogen-Induced Ductility Loss in High-Vanadium X80 Pipeline Steel

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2839
Author(s):  
Longfei Li ◽  
Bo Song ◽  
Biwen Yang ◽  
Lei Wang ◽  
Wensen Cheng
Keyword(s):  
Hydrogen Diffusion ◽  
Pipeline Steel ◽  
Control Process ◽  
Granular Bainite ◽  
X80 Pipeline Steel ◽  
Tempering Temperature ◽  
Mechanical Control ◽  
Ductility Loss ◽  
Vanadium Carbides ◽  
20 Nm

In this study, an optimum tempering temperature after a thermo-mechanical control process (TMCP) was proposed to improve the hydrogen-induced ductility loss of high-vanadium X80 pipeline steel. The results showed that with increasing tempering temperature from 450 to 650 °C, the size and quantity of granular bainite decreased but the spacing of deformed lath ferrite and the fraction of massive ferrite increased. The number of fine vanadium carbides increased as well. However, as the tempering temperature increased to 700 °C, the microstructure of T700 steel completely converted to massive ferrite and the grain size became larger. Additionally, the amount of nanoscale precipitates decreased again, and the mean size of precipitates evidently increased in T700 steel. The steel tempering at 650 °C, containing the most vanadium precipitates with a size less than 20 nm, had the lowest hydrogen diffusion coefficient and the best resistance to hydrogen-induced ductility loss.

Inhomogeneous Deformation in Thin Films

1995 ◽  
Vol 39 ◽  
pp. 627-635
Author(s):  
I. C. Noyan ◽  
C. C. Goldsmith
Keyword(s):  
Thin Films ◽  
Residual Stresses ◽  
Second Phase ◽  
Thermal Coefficient ◽  
Stress Distributions ◽  
Stress Determination ◽  
Phase Precipitation ◽  
Reliable Operation ◽  
X Ray ◽  
Layer Thin Film

Residual stresses are a major factor in the reliable operation of multi-layer thin film structures. These stresses may form due to defect incorporation during deposition, recrystallization, second-phase precipitation, thermal coefficient of expansion (TCE) mismatch, etc., as well as local plastic flow, delamination or cracking. In the literature, residual stresses are usually assumed to be constant in the plane of the film. This assumption is sometimes implicitly made, as in the cases where only two psi-tilts are used in the stress determination with the sin2Ψ analysis.In this paper, we will review the possible causes of heterogeneous stress distributions in thin films and discuss their impact on x-ray stress determination techniques using some new data from W films.

The Study on the Precipitation and Mechanical Properties of Steel with Copper

2010 ◽  
Vol 654-656 ◽  
pp. 66-69 ◽  
Author(s):  
Chuang Li ◽  
Xue Min Wang ◽  
Xin Lai He ◽  
Cheng Jia Shang ◽  
Yu He
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Volume Fraction ◽  
Optical Microscope ◽  
Second Phase ◽  
Phase Precipitation ◽  
Precipitation Behavior ◽  
Quenching Temperature ◽  
Bearing Steels ◽  
Transition Electron

The properties and precipitation behavior of Cu-bearing steels have been investigated. The optical microscope and transition electron microscope were employed to study the influence of interrupted cooling and quenching temperature on the precipitation behavior. Also, the properties of samples with different quench processes were tested. The results show that when the steel is interruptedly cooled and quenched from 650-700°C, with the quenching temperature increasing the volume fraction of martensite becomes larger and the hardness becomes higher. When the microstructure is ferrite the second-phase precipitates occurs and they are proved copper-rich particles. However there are no obvious precipitates in martensite. The copper-rich second phase forms by the way of inter-phase precipitation.

scholarly journals Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation

2017 ◽  
Vol 130 ◽  
pp. 94-110 ◽  
Author(s):  
Mahmood Mamivand ◽  
Ying Yang ◽  
Jeremy Busby ◽  
Dane Morgan
Keyword(s):  
Stainless Steels ◽  
Integrated Modeling ◽  
Second Phase ◽  
Phase Precipitation ◽  
Cold Worked

Microstructure and Mechanical Properties of X70 Pipeline Steel with High H2S Resistance

2015 ◽  
Vol 816 ◽  
pp. 755-760 ◽  
Author(s):  
Jing Li ◽  
Xiu Hua Gao ◽  
Yong Lu ◽  
Lin Xiu Du
Keyword(s):  
Mechanical Properties ◽  
Pipeline Steel ◽  
High Strength ◽  
Granular Bainite ◽  
Second Phase ◽  
Precipitation Behavior ◽  
Experimental Steel ◽  
X70 Pipeline Steel ◽  
The Matrix ◽  
Sour Service

Anti-H2S X70 pipeline steel was developed. The microstructure of X70 pipeline steel was studied by the analysis of OM, SEM and TEM. The precipitation behavior was discussed. The comprehensive mechanical properties, HIC and SCC performance were systematically studied. The results indicated that the microstructure of the experimental steel was mainly acicular ferrite and granular bainite. The second phase precipitates dispersedly distributed in the matrix. The experimental steel possessed excellent strength, plasticity, low temperature toughness and low yield ratio. And therefore, the X70 pipeline steel in the study is suitable for sour service with the high strength, excellent toughness and low HIC&SSC susceptibility.

scholarly journals The Effect of Neutron Irradiation on Second Phase Precipitation Processes

1971 ◽  
Vol 11 (5) ◽  
pp. 289-293 ◽  
Author(s):  
Z. E. OSTROVSKY ◽  
G. A. SERNYAEV ◽  
P. P. GRINTCHUK ◽  
S. N. VOTINOV ◽  
V. I. PROKHOROV
Keyword(s):  
Neutron Irradiation ◽  
Second Phase ◽  
Phase Precipitation ◽  
Precipitation Processes

Microstructures and Mechanical Properties of As-Cast and Extruded Mg-2wt.%Zn Alloy Containing Dilute Content of Misch Metal

2011 ◽  
Vol 686 ◽  
pp. 260-264
Author(s):  
Qi Chi Le ◽  
Zhi Qiang Zhang ◽  
Jian Zhong Cui ◽  
Zheng Jia
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Second Phase ◽  
Test Results ◽  
Phase Precipitation ◽  
Misch Metal ◽  
Second Phases ◽  
Microstructures And Mechanical Properties ◽  
Zn Alloy ◽  
Zn Alloys

Microstructures and Mechanical Properties of as-cast and extruded Mg–2wt.%Zn alloys containing dilute misch metal were investigated. RE additions were added in the form of relatively inexpensive cerium-rich misch metal (MM). The results indicate that the dilute MM addition has evidently effect the microstructure and mechanical properties of Mg-2wt.% Zn alloy. The grain refinement was improved and the amount of second phase precipitation was increased as increasing MM content in Mg-2wt.%Zn alloy from 0.2% to 1.5%, and the hardness determination and tensile test results show that the hardness of its ingot and the tensile strength of its extrusion rod were also enhanced, however, excessive MM addition would promote second phases forming network precipitating in grain boundary, which would result in the marked reduction of the plasticity of the alloy. Therefore, it is recommended that the MM content not exceed 0.6% in order to obtain high strength companying with relative higher elongation. The tensile properties of as-extruded Mg-2Zn-0.6wt.%MM alloy rod were UTS=266.7MPa, YS=213MPa, EL=14.5% which is similar to the corresponding properties of AZ31.

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