Effect of Calcium and Magnesium Addition on the Inclusions Distribution in the Cast Microstructure of HSLA Steel

2014 ◽  
Vol 685 ◽  
pp. 27-30
Author(s):  
Yan Liu ◽  
Kai Wang ◽  
Yang Liu ◽  
Jian Ming Wang
Keyword(s):  
Hsla Steel ◽  
New Technology ◽  
High Heat ◽  
Second Phase ◽  
Second Phase Particles ◽  
High Heat Input ◽  
Calcium And Magnesium ◽  
Cast Microstructure ◽  
Zr Alloy ◽  
Magnesium Addition

A new technology to obtain a fine-structured and high-toughness HAZ of HSLA steel for high heat input welding is developed using metallurgical thermodynamics, physical chemistry of metallurgy and material processing methods synthetically in this study. A kind of HSLA steel is designed in this experiment. The thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium and magnesium into the steel in the form of Si-Ca alloy and Mg-Zr alloy, respectively. The effect of calcium and magnesium addition on the morphology and distribution of the inclusions in the cast microstructure of HSLA steel was analysed. The results show that the distribution of the inclusions is more dense and uniform with respect to the raw steel, and the size of the inclusions is smaller than the ones in the raw steel after adding Ca and Mg elements. Ca and Mg elements can accelerate the nucleation of the inclusions. The nucleation rate of the Mg element is relatively higher. The number of the inclusions in the adding Mg steel decrease more slowly relative to the adding Ca steel with the extension of the steelmaking time.

Effect of Magnesium Addition on the Cast Microstructure of a Kind of HSLA Steel

2013 ◽  
Vol 395-396 ◽  
pp. 293-296
Author(s):  
Yan Liu ◽  
Jian Ming Wang ◽  
Yang Liu ◽  
Chun Lin He
Keyword(s):  
Acicular Ferrite ◽  
Positive Impact ◽  
Hsla Steel ◽  
New Technology ◽  
High Heat ◽  
Second Phase ◽  
Second Phase Particles ◽  
High Heat Input ◽  
Cast Microstructure ◽  
Magnesium Addition

A new technology to obtain a fine-structured and high-toughness HAZ of HSLA steel for high heat input welding is developed using metallurgical thermodynamics, physical chemistry of metallurgy and material processing methods synthetically in this study. A kind of HSLA steel is designed in this experiment. The thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding magnesium into the steel in the form of Mg-Zr alloy. The effect of magnesium addition on the cast microstructure of HSLA steel was analysed. The results show that The cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 3 wt% Mg and 5 wt% Mg, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.

Effect of Calcium and Magnesium Addition on the Cast Microstructure Grain Size of HSLA Steel

2014 ◽  
Vol 685 ◽  
pp. 22-26
Author(s):  
Yan Liu ◽  
Kai Wang ◽  
Yang Liu ◽  
Jian Ming Wang
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Hsla Steel ◽  
Second Phase ◽  
Mean Grain Size ◽  
The Mean ◽  
Calcium And Magnesium ◽  
Observation Method ◽  
Cast Microstructure ◽  
Magnesium Addition

A kind of HSLA steel is designed in this experiment. The thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium and magnesium into the steel in the form of Si-Ca alloy and Mg-Zr alloy, respectively. The effect of calcium and magnesium addition on the cast microstructure grain size of HSLA steel was analysed. The grain size of the cast microstructure in each sample was measured by the metalloscope observation method. The results show that a large amount of oxides generated from the adding Ca and Mg elements into the steel can accelerate the nucleation and refrain the grain growth, so the grains are refined. In the process of improving temperature, the oxides of Ca and Mg elements located in the interior of austenite can accelerate the nucleation and impede the grain growth. Almost every grain becomes finer after adding Ca and Mg elements. When adding 5wt% Mg, the mean grain size is the smallest, 0.712 mm, while the biggest grain size is 1.115mm in raw steel. The grain size in Mg 5wt% steel is refined by 36.1% in contrast with the raw steel. According to the adding amounts of Ca and Mg elements in experimental steel, the range of the mean grain size is from 0.712 mm to 0.975 mm.

Effect of Calcium Addition on the Cast Microstructure of a Kind of HSLA Steel

2014 ◽  
Vol 685 ◽  
pp. 18-21
Author(s):  
Yan Liu ◽  
Yang Liu ◽  
Jian Ming Wang ◽  
Kai Wang
Keyword(s):  
Acicular Ferrite ◽  
High Stability ◽  
Positive Impact ◽  
Hsla Steel ◽  
Second Phase ◽  
Rolled Steel ◽  
High Melting Point ◽  
Calcium Addition ◽  
Second Phase Particles ◽  
Cast Microstructure

Using the oxide of high melting-point and high stability to pin the grain boundaries is an effective method to improve the welding performance of the HSLA steel in this study. A kind of HSLA steel is designed in this experiment. The thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium into the steel in the form of Si-Ca alloy. The effect of calcium addition on the cast microstructure of HSLA steel was analysed. The results show that the cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 5 wt% Ca, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.

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.

Effect of Calcium Addition on the Cast Microstructure of a Kind of HSLA Steel

2013 ◽  
Vol 401-403 ◽  
pp. 594-597
Author(s):  
Yan Liu ◽  
Jian Ming Wang ◽  
Chun Lin He ◽  
Li Quan Chen
Keyword(s):  
Acicular Ferrite ◽  
Positive Impact ◽  
Hsla Steel ◽  
Rapid Development ◽  
Steel Structure ◽  
High Energy ◽  
Second Phase ◽  
Great Opportunity ◽  
Calcium Addition ◽  
Cast Microstructure

The rapid development of the large steel structure brings a great opportunity for steelmaking industry. The steel plates not only have the strength and toughness but also can withstand the high energy input welding. Using the calcium oxide of high melting-point and high stability to pin the grain boundaries is an effective method to improve the welding performance of the structure steel. This experiment takes the HSLA steel as the research object, the second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium into the steel in the form of Ca-Si alloy. The effect of calcium addition on the cast microstructure of HSLA steel was analysed. The results show that the cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 5 wt% Ca, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.

scholarly journals Dissolution of the second phase particles in the course of the equal channel angular pressing of diluted Cu‑Cr‑Zr alloy

2018 ◽  
Vol 8 (1) ◽  
pp. 110-114 ◽  
Author(s):  
I. A. Faizov ◽  
R. R. Mulyukov ◽  
D. A. Aksenov ◽  
S. N. Faizova ◽  
N. V. Zemlyakova ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Second Phase ◽  
Angular Pressing ◽  
Second Phase Particles ◽  
Zr Alloy
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