Effect of Nano CaO and MgO Addition on the Inclusions Composition in the Cast Microstructure of X80 Pipeline Steel

2013 ◽  
Vol 395-396 ◽  
pp. 289-292
Author(s):  
Yan Liu ◽  
Chun Lin He ◽  
Qian He Ma ◽  
Yang Liu
Keyword(s):  
Electron Microscope ◽  
Molten Steel ◽  
Pipeline Steel ◽  
Energy Dispersive Spectrometer ◽  
X80 Pipeline Steel ◽  
Composite Oxides ◽  
Segregation Phenomenon ◽  
Calcium And Magnesium ◽  
Scanning Electron ◽  
Cast Microstructure

Nanometer calcium and magnesium oxides were added into molten steel by the carrier method in the experiment. The experiment takes the X80 pipeline steel as the research object and analyses the effect of nanometer calcium and magnesium oxides addition on the inclusions in the cast microstructure of the X80 pipeline steel. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to analyze the composition of the inclusions in the cast microstructure of the X80 pipeline steel. The result reveals that when no addition of nanooxides, the inclusions in the cast microstructure are the C-Fe-Si-Al-Mn-based inclusions. When adding nanoMgO, the inclusions are mainly the composite oxides of Fe-Mg-Si-O, Fe-Mg-Si-Mn-O and Mg-Si-Mn-Al-O. When adding nanoCaO, the inclusions are mainly the composite oxides of Fe-Ca-Al-O, Fe-Ca-Si-O, Fe-Ca-Si-Mn-O and the composite oxides or sulfides of Fe-Ca-Si-Mn-O-S. There is more Fe in some inclusions and Fe is not uniformly dispersed in the molten steel. As the result, some certain segregation phenomenon takes place.

Effect of Nanometer Calcium and Magnesium Oxides Addition on the Inclusions in the Cast Microstructure of X80 Pipeline Steel

2013 ◽  
Vol 401-403 ◽  
pp. 606-609
Author(s):  
Jian Ming Wang ◽  
Yan Liu ◽  
Chun Lin He ◽  
Yang Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Molten Steel ◽  
Pipeline Steel ◽  
X80 Pipeline Steel ◽  
Oxide Addition ◽  
Calcium And Magnesium ◽  
Aggregation Phenomenon ◽  
Scanning Electron ◽  
Cast Microstructure

Nanometer calcium and magnesium oxides were added into molten steel by the carrier method in the experiment. The experiment takes the X80 pipeline steel as the research object and analyses the effect of nanometer calcium and magnesium oxides addition on the inclusions in the cast microstructure of the X80 pipeline steel. The scanning electron microscope (SEM) was used to analyse the morphology and distribution of the inclusions in the cast microstructure of the X80 pipeline steel. The results reveal that there are a small amount of inclusions in the sample of no nanometer oxides addition. With the amount of the nanoMgO oxide addition rising, the number of the inclusions in the sample firstly increases and then decreases gradually. When adding 0.05 wt% nanoMgO or CaO oxides, the size of the inclusions is big and the aggregation phenomenon appears. When adding 0.02 wt% nanoMgO or CaO oxides, the number of the inclusions in the cast microstructure is the most, whose size is smaller, about 2~4 μm and the inclusions are the most uniformly distributed.

Effect of Nanometer Calcium and Magnesium Oxides Addition on the Cast Microstructure Grain Size of Pipeline Steel

2013 ◽  
Vol 380-384 ◽  
pp. 4245-4248
Author(s):  
Jian Ming Wang ◽  
Yan Liu ◽  
Long Xian Ding ◽  
Qian He Ma
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Molten Steel ◽  
Pipeline Steel ◽  
Great Influence ◽  
X80 Pipeline Steel ◽  
Line Method ◽  
Calcium And Magnesium ◽  
Cast Microstructure

Nanometer calcium and magnesium oxides were added into molten steel by the carrier method in the experiment. The experiment takes the X80 pipeline steel as the research object and analyses the effect of nanometer calcium and magnesium oxides addition on the cast microstructure grain size. The grain size of the cast microstructure in each sample was measured by the cutting line method. The results show that the nanometer oxides addition has a great influence on the cast microstructure grain size. When adding 0.01 wt% nanoCaO or MgO oxides, the grain size decreases from 0.664 mm to 0.632 mm and 0.457 mm, respectively. When adding 0.02 wt% nanoCaO or MgO oxides, the grain size becomes finer, and the cast microstructure is remarkably refined. In contrast with the grain size of no nanometer oxides addition, the grain size decreases from 0.644 mm to 0.438 mm and 0.389 mm and is refined by 1.47 and 1.66 times, respectively. When adding 0.05 wt% nanoMgO oxides, the grain size does not decrease, but increases to 0.778 mm. The reason is that as the amount of adding oxides increases, the dispersity of the nanometer oxides becomes worse, and the agglomeration of the grains occurs. Therefore, the nanometer oxides can not achieve the role of grain refinement.

scholarly journals The effect of MgTiO3Adding on Inclusion Characteristics

2019 ◽  
Vol 38 (2019) ◽  
pp. 576-581
Author(s):  
Xu Chen ◽  
Zhang Mingya ◽  
Li Jianli ◽  
Ran Songlin ◽  
Shan Mengwei ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Molten Steel ◽  
Thermodynamic Calculation ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Treated Sample ◽  
Scanning Electron

AbstractMgTiO3 powder was directly added into molten steel at 1873K, and its effect on inclusion characteristics was studied by a scanning electron microscope and an energy dispersive spectrometer. Thermodynamic calculation indicates that MgTiO3 is unstable in molten steel and may decompose into [Ti], [O] and MgO. However, only Ti-bearing inclusions were observed in the treated sample, and Mg-bearing inclusions were absent. This can be explained by the features of wettability and stability for MgO. Compared with a Non-treated sample, both oxide and coarse MnS in treated sample were refined. For the oxide, this originates from the formation of Ti-bearing inclusion. For coarse MnS, this may be due to the fact that Ti can aggravate S segregation. Besides, this aggravation makes coarse MnS less globular. After etching, it was found that in the treated sample, Ti-bearing inclusion can induce the nucleation of intragranular acicular ferrites. This appearance was totally different from that of Non-treated sample, and indicates the effectiveness of external adding method in oxide metallurgy.

Microstructure and microanalysis of sintered Fe-Nd-B permanent magnets

1990 ◽  
Vol 48 (4) ◽  
pp. 990-991
Author(s):  
Mahesh Chandramouli
Keyword(s):  
Electron Microscope ◽  
Liquid Phase ◽  
Permanent Magnets ◽  
Phase Distribution ◽  
Energy Dispersive Spectrometer ◽  
Nucleation And Growth ◽  
Liquid Phase Sintering ◽  
Domain Wall Energy ◽  
Oxide Phases ◽  
Scanning Electron

Magnetization reversal in sintered Fe-Nd-B, a complex, multiphase material, occurs by nucleation and growth of reverse domains making the isolation of the ferromagnetic Fe14Nd2B grains by other nonmagnetic phases crucial. The magnets used in this study were slightly rich in Nd (in comparison to Fe14Nd2B) to promote the formation of Nd-oxides at multigrain junctions and incorporated Dy80Al20 as a liquid phase sintering addition. Dy has been shown to increase the domain wall energy thus making nucleation more difficult while Al is thought to improve the wettability of the Nd-oxide phases.Bulk polished samples were examined in a JEOL 35CF scanning electron microscope (SEM) operated at 30keV equipped with a Be window energy dispersive spectrometer (EDS) detector in order to determine the phase distribution.

Study on the Formation of Nanometer Silver Sol by Micro Arc Discharge

2014 ◽  
Vol 490-491 ◽  
pp. 8-13
Author(s):  
Jing Yang ◽  
Zhi Yu Yan ◽  
Bing Sun ◽  
Qiao Min Wang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electrolyte Solution ◽  
Sodium Citrate ◽  
Preparation Method ◽  
Arc Discharge ◽  
Energy Dispersive Spectrometer ◽  
Original Size ◽  
Stabilizer Type ◽  
Scanning Electron

A preparation of nanometer silver sol by micro arc discharge has been study here through the reduction of Ag3PO4. Sodium citrate and polyvinylpyrrolidone were added respectively into the electrolyte as stabilizer. The results show that, the Ag3PO4 concentration, stabilizer type and concentration have great impacts on the formation of the nanometer silver sol. By means of UV-VIS extinction spectrophotometer, scanning electron microscope and energy dispersive spectrometer, it is found that the solid powder extracted from the electrolyte solution after discharge is the aggregation of the silver formed in the solution and their original size maybe less than 20nm. Nanometer silver with smaller size and narrower size distribution can be obtained with sodium citrate as stabilizer than with polyvinylpyrrolidone. But the latter has higher conversion rate. From this experiment, we found that micro arc discharge can be a rapid, stable preparation method of nanometer silver sol.

scholarly journals Calorimetric study on Bi-Cu-Sn alloys

2019 ◽  
Vol 38 (2019) ◽  
pp. 541-546
Author(s):  
Jolanta Romanowska
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Temperature Interval ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Calorimetric Study ◽  
Calorimetric Investigation ◽  
Scanning Calorimetry ◽  
Scanning Electron

AbstractThe paper presents results of calorimetric investigation of the Bi-Cu-Sn system by means of differential scanning calorimetry (DSC) at the temperature interval 25-1250∘C, Values of liquidus, solidus and invariant reactions temperatures, as well as melting enthalpies of the selected alloys were determined. Microstructure investigation of the alloys were performed by the use of a scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS).

scholarly journals Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5262
Author(s):  
Liping Wu ◽  
Jianguo Zhi ◽  
Jiangshan Zhang ◽  
Bo Zhao ◽  
Qing Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Heterogeneous Nucleation ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Vessel Steel ◽  
Cryogenic Vessel ◽  
Central Segregation ◽  
Scanning Electron

The effects of Cerium (Ce) were studied on the casting slab quality, microstructure, and inclusion evolution of cryogenic vessel steel. An optical metallographic microscope, scanning electron microscope, energy dispersive spectrometer, and Thermo-calc thermodynamic software were used for characterization and analysis. The results indicated that the central segregation was significantly improved after adding Ce and reached the lowest level when the content of Ce was 0.0009 wt.%. Meanwhile, the presence of Ce reduces the size of ferrite and improves pearlite morphology. Ce also enables the modification of Al2O3 and MnS + Ti4C2S2 inclusions into ellipsoid CeAlO3 and spherical Ce2O2S + Ti4C2S2 composite inclusions, respectively, which are easier to remove. The formed Ce2O2S inclusions are fine and can work as heterogeneous nucleation points to refine the microstructure of 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.

scholarly journals Enhancing the Mechanical Properties of Hot Roll Bonded Al/Ti Laminated Metal Composites (LMCs) by Pre-Rolling Diffusion Process

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 795 ◽  
Author(s):  
Cheng Zhang ◽  
Shouxin Wang ◽  
Hanxue Qiao ◽  
Zejun Chen ◽  
Taiqian Mo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Diffusion Process ◽  
Energy Dispersive Spectrometer ◽  
Tensile Tests ◽  
Optical Microscope ◽  
Interfacial Structure ◽  
Metal Composites ◽  
Diffusion Temperature ◽  
Scanning Electron

In this study, the traditional hot rolling to fabricate Al/Ti laminated metal composites (LMCs) was improved by using a pre-rolling diffusion process. The effect of the pre-rolling diffusion on microstructure and mechanical properties of Al/Ti LMCs were investigated by various methods, such as optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and tensile tests. The results show that, with increasing diffusion temperature, the thickness in diffusion layer was increased and the mechanical properties of LMCs were improved obviously, which was attributed to the optimized interfacial structure after diffusion process. In addition, the formation of TiAl3 intermetallic compounds (IMCs) was detected in the bonding interface, which played an important role in improving the mechanical properties for Al/Ti LMCs. The predicted results of stress-strain curves from rule of mixture (ROM) indicated that, there existed an extra interfacial strengthening in Al/Ti LMCs beside the mechanical properties provided by the contribution of constituent layers. The pre-rolling diffusion process is effective for the optimization of interfacial structure and improvement of mechanical properties in Al/Ti LMCs.

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