The Influence of Using Different Types of Risers or Chills on Shrinkage Production for Different Wall Thickness for Material EN-GJS-400-18LT

Vasková, Iveta; Conev, M.; Hrubovčáková, Martina

doi:10.1515/afe-2017-0064

Cited by 7 publications

(9 citation statements)

References 3 publications

(1 reference statement)

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“…The effect of material composition and proportions on heating and insulation properties was studied [1], and the heat exchange coefficient between the riser surface and surroundings was evaluated [2]. Shrinkage defects could be influenced by different riser types in ductile iron castings [3]. Modeling and simulation was used to improve riser efficacy for reducing defects [4].…”

Section: Introductionmentioning

confidence: 99%

Exploration and Improvement of Room Temperature Properties for Organosilicon Slag Riser

Lu,

Zhong,

Yongluan

et al. 2024

Archives of Foundry Engineering

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Organosilicon slag, generated as a waste product from organosilicon monomer production, had limited options for resource utilization. Previous experiments utilized recovered organosilicon slag to partially replace heating materials in preparing exothermic insulating risers. However, the incorporation of organosilicon slag led to specific issues in the risers including low compressive strength, high resin addition requirement and easy ignition during drying. In order to address these problems, this study analyzed the effects of resol resin parameters and organosilicon slag on the ambient temperature properties of heating insulating risers through single-factor experiments. In addition, adjustment was made to the drying process and an optimal preparation scheme was determined via orthogonal experiments. The purpose of the study was to prepare risers with reduced resin content, increased organosilicon slag addition and adequate compressive strength. Results showed that selecting a resin viscosity of about 170 mPa.s and resin addition of about 13% allowed for relatively good compressive strength and air permeability with less resin required. Additionally, an organosilicon slag addition of 18-21% and particle size under 30 mesh(550 μ m) was beneficial for improving compressive strength. Adjusting the drying process to a two-step heat preservation approach (180°C for 25 min, then 130°C for 35 min) slightly decreased compressive strength compared to the original process; nevertheless, it improved air permeability and prevented the risers from igniting spontaneously during subsequent drying. The optimized preparation scheme determined through orthogonal experiments involved 150 mPa.s resin viscosity, 14% resin addition, 21% organosilicon slag addition and slag particle size less than 30 mesh (550 μm). This yielded a compressive strength of 4.21MPa and air permeability of 75.6, exceeding the standard of the exothermic insulating riser: GB/T13040-2017.

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Section: Introductionmentioning

confidence: 99%

Exploration and Improvement of Room Temperature Properties for Organosilicon Slag Riser

Lu,

Zhong,

Yongluan

et al. 2024

Archives of Foundry Engineering

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“…In foundry practice, the exothermic insulating riser could increase the temperature of the metal liquid through its heat combustion and delay the solidification of the metal liquid, so that the efficiency of feeding could be increased during casting. Some existing studies had improved the performance or defects of the riser by modeling and computer simulation [1][2][3]. The change in the composition and ratio of the different materials of the riser also affected the casting effect most directly [4].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Optimization of Organosilicon Slag Exothermic Insulating Riser

Lu,

Qian,

Yang

et al. 2022

Archives of Foundry Engineering

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The exothermic insulating riser played an important role in the solidification process of metal liquid for the improvement of casting quality. This paper focused on the use of organosilicon slag to replace part of the aluminum powder as an exothermic agent for the riser, to reduce production costs and turn waste into treasure. The experiments firstly studied the effect of organosilicon slag content on the combustion temperature and holding time and determined the components of the riser exothermic agent and organosilicon slag. On this basis, the effects of the content of Na3AlF6 flux and alkali phenolic resin binder on the combustion heating time and strength properties of the riser were studied. And the ratio of mixed oxidants was determined by single-factor orthogonal experiments to optimize the addition of three oxidants, Fe3O4, MnO2, and KNO3. Finally, the performance of the riser prepared after optimization was compared with that of the riser prepared with general aluminum powder. The results showed that with the mixture of 21% organosilicon slag and 14% aluminum powder as the exothermic agent, the highest combustion temperature of the prepared exothermic insulating riser was 1451℃ and the holding time was 193 s; the optimal content of Na3AlF6 flux was 4%, and the best addition alkali phenolic resin binder was 12%; the optimized mixing ratio of three oxidants was 12% for Fe3O4, 6% for MnO2, and 6% for KNO3. Under the optimized ratio, the maximum combustion temperature of the homemade riser was 52℃ and the heat preservation time was 14% longer compared with the conventional exothermic insulating riser with 25-35% aluminum powder.

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“…Cast iron is a material with good mechanical and physical properties. Its relatively low production costs increase an interest in its application in various industries [1,2,3]. Cast iron with spheroidal graphite is a modern material with excellent mechanical properties whose tensile strength is even comparable to that of steel.…”

Section: Introductionmentioning

confidence: 99%

study of ductile iron production for castings designated for extreme conditions

Socha

Gryc

Sviželová

et al. 2021

METAL 2021 Conference Proeedings

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This paper studies the possibility of producing ductile iron castings intended for extreme conditions on an industrial scale. The preparation of charge and its melting conditions, modification, primary inoculation and main inoculation were studied within extensive series of experimental melts. In the scope of charge evaluation, especially the ratio of sorel type raw iron to steel charge was studied in order to reduce the raw iron portion while maintaining the castings qualitative requirements. The modifiers FeSiMg621 and FeSiMg731 were evaluated during modification. During primary inoculation the inoculants Inocast100 and SB10 were compared. The inoculation blocks Germalloy were used during main inoculation. The implementation of experimental melts was followed by chemical composition analysis, metallographic evaluation and a study of microstructure and mechanical testing performance of samples. The chemical composition was determined based on optical emission spectrometry and combustion analysis. The metallographic analysis and the microstructure evaluation were made using an optical microscope and image analysis. Testing of mechanical properties was focused on the tensile test, impact test and hardness test. It was proved that the foundry was able to produce the required quality ductile iron made of different combinations of charge materials, modifiers and inoculants. All contemplated combinations of the production technology meet the standard-defined requirements for this type of material.

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The Influence of Using Different Types of Risers or Chills on Shrinkage Production for Different Wall Thickness for Material EN-GJS-400-18LT

Cited by 7 publications

References 3 publications

Exploration and Improvement of Room Temperature Properties for Organosilicon Slag Riser

Exploration and Improvement of Room Temperature Properties for Organosilicon Slag Riser

Preparation and Performance Optimization of Organosilicon Slag Exothermic Insulating Riser

study of ductile iron production for castings designated for extreme conditions

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