Effect of preconditioning on the microstructure and mechanical properties of ductile cast iron

Mojisola, Tajudeen; Seidu, Saliu Ojo; Olubambi, Peter Apata; Adediran, Adeolu Adesoji

doi:10.1016/j.matpr.2022.02.081

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Recent publications [13][14][15] have shown that efficient preconditioning influences the microstructure of SGI by increasing the volumetric nodule density of graphite and nodularity. Preconditioning also produces a more uniform size distribution of the graphite particles and decreases the chill solidification [11,14].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Spheroidal Graphite Irons: A Study of the Effect of Preconditioning Treatment

Pires

Simões

Michels

et al. 2022

Metals

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The effect of preconditioning treatments on the control and improvement of spheroidal graphite iron (SGI) microstructure was evaluated. In the melt, 0.15% of Zr-(Ca, Al) FeSi preconditioner was added into different conditions. Four samples were produced for this investigation: (1) in the first melt, there was no addition of a preconditioner for comparative purposes; (2) in the second melt, the preconditioner was added at the cold charge; (3) in the third melt, the preconditioner was added before the last cold charge; and (4) in the fourth melt, the preconditioner was added at tapping from the furnace. Microstructural characterization was conducted to understand the effect of the treatment on the SGI. Optical microscopy results show that preconditioning treatment increases graphite’s nodule density, ferrite content, and nodularity. Scanning electron microscopy (SEM), energy dispersive energy (EDS), and electron backscatter diffraction (EBSD) analysis were used to identify the types of microparticles present in the graphite nodules. Some complex microparticles were identified as AlMg2.5Si2.5N6, MgS, and CaS. The microstructural characteristics of the matrix, such as grain size, crystallographic orientation, and misorientation, were also evaluated by the EBSD. The addition of the preconditioning at tapping results in a higher ferrite fraction, smaller grain size, misorientation, and hardness values. This work suggests that the different preconditioning practice has a crucial effect on the microstructural characteristics of the SGI. This knowledge is vital, allowing the microstructure tailoring to enhance the mechanical properties of SGI to obtain the best performance of these materials.

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Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Spheroidal Graphite Irons: A Study of the Effect of Preconditioning Treatment

Pires

Simões

Michels

et al. 2022

Metals

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“…These defects are also more likely to cause the formation of pits. However, these defects could be improved by suitable surface mechanical treatment techniques [10,11], thus enhancing the corrosion resistance of ductile iron castings in aqueduct services.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Mechanisms and Kinetics of the Localized Corrosion Aggravation of Ductile Iron in a Harsh Water Quality Environment

Wang

Liu

Tao

et al. 2022

Metals

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Ductile iron is a high-strength cast iron material. The spherical graphite obtained by inoculation treatment effectively improves the mechanical properties of cast iron, resulting in higher strength than carbon steel. However, severe corrosion may occur under specific circumstances, especially in thermal water pipelines. In this paper, the corrosion mechanisms at the main defective points of ductile iron were investigated using microscopic morphological characterization after accelerated tests combined with numerical simulations. The influence law of each environmental factor on the corrosion kinetics of ductile iron in a complex water quality environment was studied using dynamic potential polarization tests. The results showed that the main causative factors leading to the increased corrosion of ductile iron were the presence of tail-like gaps on its surface, and the crescent-shaped shrinkage and loosening organization around the graphite spheres. After mechanical treatment was applied to eliminate the obvious defects, the number of corrosion pits was reduced by 41.6%, and the depth of the pits was slowed down by 40% after five days. By comparison, after ten days, the number of pits was reduced by 51%, and the depth of the pits was slowed down by 50%. The dynamic potential polarization test results show that the dissolved oxygen concentration has the greatest influence on the corrosion of ductile iron in the simulated water environment; meanwhile, the water hardness can slow down the corrosion of ductile iron. The relative influence of each environmental factor is as follows: dissolved oxygen concentration > temperature > immersion time > water hardness > pH > Cl−.

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Wear and corrosion behavior of vanadium-alloyed nodular cast irons fabricated by sand-casting

Turu,

Gecu

2023

Wear

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Effect of preconditioning on the microstructure and mechanical properties of ductile cast iron

Cited by 3 publications

References 10 publications

Microstructural Characterization of Spheroidal Graphite Irons: A Study of the Effect of Preconditioning Treatment

Microstructural Characterization of Spheroidal Graphite Irons: A Study of the Effect of Preconditioning Treatment

A Study of the Mechanisms and Kinetics of the Localized Corrosion Aggravation of Ductile Iron in a Harsh Water Quality Environment

Wear and corrosion behavior of vanadium-alloyed nodular cast irons fabricated by sand-casting

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