scholarly journals Characteristics of MgAl2O4-TiN Complex Inclusion Precipitation and Growth during Solidification of GCr15SiMn in ESR Process

2015 ◽  
Vol 55 (8) ◽  
pp. 1693-1698 ◽  
Author(s):  
Liang Yang ◽  
Guo-guang Cheng ◽  
Shi-jian Li ◽  
Min Zhao ◽  
Gui-ping Feng
Keyword(s):  
2021 ◽  
Vol 118 (2) ◽  
pp. 220
Author(s):  
Jian Kang ◽  
Yan-Chong Yu ◽  
Jin-Ling Zhang ◽  
Chao Chen ◽  
She-Bin Wang

The effect of rare earth (RE) on inclusion in HRB500E steel was studied based on plant trials. The results showed that S decreased by 47.6% after 0.0059% RE treatment. In samples without RE treatment, the inclusions change from Al2O3-MnO to ellipsoidal Al2O3-MnO-CaO complex inclusion, and the size of such inclusions is ≤ 2 µm and isolated strip MnS inclusion with the size of ≥ 2 µm. With RE treatment, Al2O3-MnO-CaO inclusions are transformed into spherical or ellipsoidal REAlO3 and REAlO3-MnS. The size of such inclusions is ≈ 1.5 µm and single MnS inclusions were not found. The number density and size of inclusions changed significantly after RE treatment. Thermodynamic calculations show that the Gibbs free energy of RE inclusions is more negative and more stable. The transformation model of inclusions is established to illustrate the modification of inclusions during the smelting process.


2021 ◽  
Vol 14 (4) ◽  
pp. 1-6
Author(s):  
Tatiana V. Portnova

The purpose of the article is to examine modern projects in the field of choreography, interconnected with art museums that open doors for choreographers and together embody creative ideas. It is this creative, largely subjective, controversial dialogue between the museum and dance, accompanied by comments of art historians, choreographers, and artists, that gets its meaning in the presented material. The novelty of the study lies in assessing the main directions of choreographic activity, which can be mutually transformed so that the museum and dance function successfully in modern conditions and build a new communicative space with the audience. Through a creative analysis of the modern experience of dance practices, it is possible to discover the principles and trends that are destined to breathe new life into the museum space. The considered examples of organising a museum space with theatrical and plastic direction interacting with it clearly demonstrate that modern visual strategies, associated primarily with its interactive substance, affect the communicative and exhibition space of the museum in different ways. A choreographic performance was analysed as part of a diverse event taking place on the territory of the cultural and historical museum complex; inclusion of dance in the dynamics of the halls of the interior spaces of the museum; entry of a choreographic performance, theatrical actions into the exhibition space of expositions; the museum itself inviting artists, choreographic schools and studios to conduct regular classes and masterclasses within the walls of the museum to popularise its collections, and other examples of forms of interaction between the art of dance and the art museum.


2019 ◽  
Vol 64 (4) ◽  
pp. 1049-1071 ◽  
Author(s):  
Karim Ehab Moustafa Kamel ◽  
Bernard Sonon ◽  
Thierry Jacques Massart

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 197 ◽  
Author(s):  
Ping Shen ◽  
Jianxun Fu

In resulfurized special steel, MnS and Al2O3 are two main inclusions that deteriorate fatigue life and machinability. It is important that these two inclusions should be well controlled to increase steel quality and usage performance. In the present study, a Mg–Ca treatment was employed to modify the MnS and Al2O3 inclusions in resulfurized steels to reduce detrimental effects on fatigue life and machinability. In the laboratory study, Ni–Mg alloy was added to 16MnCrS5 and 49MnVS3 steels. Both Al2O3 and CaO–Al2O3 were gradually modified to MgO·Al2O3 and MgO, being surrounded by MnS, that is, a complex inclusion with an oxide core and sulfide outer layer was formed. The amount of the complex inclusion increased with Mg content. In the hot forging experiment, non-Mg treated inclusions were in the morphology of long strip, while those with Mg treatment were seen to be less deformed with spherical morphology of low aspect ratio in which case inclusions had less effect on steel mechanical properties. The Mg–Ca treatment was also applied to the manufacture of resulfurized special steel in steel plants. The scanning electron microscope–energy dispersive spectrometer and statistical results agreed well with those in the laboratory studies.


2013 ◽  
Vol 746 ◽  
pp. 501-504
Author(s):  
Tang Yu

In order to improve fatigue life of wheel steel, secondary-refining process is done with Al-deoxidation and slag of high basicity, high Al2O3 content and low oxidizing property. [M, [C content in molten steel would be influenced by slag composition. It is found that high basicity, high Al2O3 content and low oxidizing property is positive factor for proper [M, [C content in molten steel which is the key of inclusion transformation from Al2O3 to CaO-MgO-Al2O3 complex inclusion, contributing to the enhancement of fatigue performance for wheel steel.


2012 ◽  
Vol 535-537 ◽  
pp. 620-627 ◽  
Author(s):  
Chengwei Yang ◽  
Min Jiang ◽  
Xinhua Wang ◽  
Tie Ou

High temperature confocal laser microscope, FE-SEM-EDS and EPMA were utilized to study the Ti-Mn-Al-Si-O-S complex inclusion inducing IAF in Ti deoxidized steel. FactStage was also used to calculate the thermodynamics of inclusion formation. It was demonstrated that when the cooling rate is fixed to 5°C/s, IAF can be induced by complex inclusions which act as the core of IAF at 609°C. Microstructure of the complex inclusions is complicated. These inclusions are consisted of the TiOx-MnO core which is surrounded by MnO-Al2O3-SiO2 complex inclusions and small amount of MnS. The reason that Ti-Mn-Al-Si-O-S complex inclusions can induce IAF is that a Mn-depleted zone is formed by the core TiOx-MnO and the MnS around it. Meanwhile, the difference between MnO-Al2O3-SiO2 and austenite thermal expansion coefficients is tremendous is another principle element for the IAF formation.


2013 ◽  
Vol 634-638 ◽  
pp. 1864-1868
Author(s):  
Shuo Ming Wang ◽  
Cheng Liang Du ◽  
Ju Gao

According to the production process of 20g steel(120t BOF→ LF→ CC), some system analysis are introduced to research on the content of T[O] and [N] and the type, source, composition and quantity of micro inclusions in refining process, pouring process and casting billet. The results of the study show: the content of T[O] is 93.2ppm in the normal billet which is 37.8ppm more than that at steady state in the export of tundish. The content of T[O] is 140.5ppm in the compound casting billet which is 70.133ppm more than that at non-steady state in the export of tundish. The secondary oxidation of mould is serious at casting progress. In billet, the quality of CaS-SiO2-Al2O3 complex inclusion is the most, the quality of MnS inclusion is the second, and the quality of Al2O3 inclusion is the least. The sulphur content in micro-inclusion of billet is higher. The sulphur content in CaS-SiO2-Al2O3 complex inclusion is 3~15%, the sulphur content in MnS inclusion is 25%. The particle size of less than 10μm in micro-inclusions is the largest. The particle size of 0~5μm is about 60%, the particle size of 5~10μm is about 35%, the particle size of 10~15μm is about 5%. The average total volume rate of micro-inclusion is 0.149% in normal billet. The average total volume rate of micro-inclusion is 0.184% in compound casting billet which is 1.23 times than normal billet. The number of micro-inclusion is 36.5/ mm2 in normal billet. The number of micro-inclusion is 58.5/ mm2 in compound casting billet which is 60.27% higher than normal billet. The non-steady state casting has serious influence on billet cleanliness.


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