Browsing Engineering by Author "Rocha, Vinicius Cardoso da"
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Analysis and verification of process variables as causes for macroinclusions and scrapping in a special steel melt shop
Ferreira, Felipe Buboltz; Rocha, Vinicius Cardoso da; Bielefeldt, Wagner Viana; Vilela, Antonio Cezar Faria (2020) [Journal article]The technology used in manufacturing steel for mechanical constructions has made great progress in recent years, resulting in a remarkable reduction of the impurities in special steel. One of these impurities is known as ... -
Analysis of secondary refining slag parameters with focus on inclusion cleanliness
Pereira, Julio Anibal Morales; Rocha, Vinicius Cardoso da; Yoshioka, Ayumi; Bielefeldt, Wagner Viana; Vilela, Antonio Cezar Faria (2018) [Journal article]Secondary refining slag samples with different chemical compositions (45-54 % CaO, 7-13 % Al2O3, 20-29 % SiO2, 9-16 % MgO, 0-5 % CaF2) were investigated to verify the influence of their effective viscosity on inclusion ... -
Analysis of spinel based inclusions during the last stage of the steelmaking process of SAE 52100
Pereira, Julio Anibal Morales; Rocha, Vinicius Cardoso da; Alves, Pedro Cunha; Bielefeldt, Wagner Viana; Vilela, Antonio Cezar Faria (2020) [Journal article]Al2 O3 (alumina) and MgO·Al2 O3 (spinel) inclusions cause valve obstruction (clogging) in continuous casting and can deteriorate the quality of the final product. In this context, industrial heats of the bearing steel SAE ... -
Assessment of viscosity calculation for calcium-silicate based slags using computational thermodynamics
Rocha, Vinicius Cardoso da; Silva, Miguel Lahr da; Bielefeldt, Wagner Viana; Vilela, Antonio Cezar Faria (2018) [Journal article]This study focuses on the viscosity calculation of molten slags using computational thermodynamics. Different slag systems and their measured viscosities from different references were used and compared with those obtained ... -
Effective viscosity of slag and kinetic stirring parameter applied in steel cleanliness during vacuum degassing
Rocha, Vinicius Cardoso da; Pereira, Julio Anibal Morales; Yoshioka, Ayumi; Bielefeldt, Wagner Viana; Vilela, Antonio Cezar Faria (2017) [Journal article]The process of vacuum degassing occurs during the secondary refining of special steels. Its main function is to remove undesirable gases. However, during this process, flotation phenomenon and inclusions absorption are ... -
Evaluation of thermodynamic driving force and effective viscosity of secondary steelmaking slags on the dissolution of Al2O3-based inclusions from liquid steel
Alves, Pedro Cunha; Rocha, Vinicius Cardoso da; Pereira, Julio Anibal Morales; Bielefeldt, Wagner Viana; Vilela, Antonio Cezar Faria (2021) [Journal article]Dissolution of Al2O3-based inclusions are paramount during production of special steel and slag engineering is key to enhance this phenomenon. This work evaluates the influence of thermodynamic driving force (ΔC) and ...