Study on the effect of micro-shrinkage porosity on the ultra-low temperature toughness of ferritic ductile iron

Chen, Shuying; Li, Qingchun; Sun, Min; Song, Jiajian; Chang, Guowei

doi:10.1515/htmp-2022-0238

Cited by 2 publications

(2 citation statements)

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“…Closed shrinkage defects appear to be influenced by the gas content dissolved in the melt as well as the degree of impurities because they associate with the formation and growth of porosity in the mushy region. The defects, such as shrinkage porosity, have a negative impact on the tensile strength, ductility and fatigue life of cast components (Chen et al, 2022). It makes sense that figuring out how shrinkage porosity forms and developing subsequent procedures that might eliminate it in casting are not only potential ways to increase quality but also ways to cut costs.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on effect of carbon equivalent and inoculation on the solidification and shrinkage tendency of ductile cast iron using thermal analysis

Sangame,

Reddy

2023

MMMS

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PurposeThe foundry industry incurs additional costs as a result of defective castings. Shrinkage defects are a frequent problem in ductile iron castings. It is still essential to understand how shrinkage porosity varies in size when the ductile iron composition changes. This information can be used to produce high-quality cast parts and determine the best processing conditions. The objective of this research paper is to examine the effect of carbon equivalent and inoculation on the morphology of the shrinkage defect using thermal analysis.Design/methodology/approachThis study focuses on certain thermal analysis parameters, such as the angle of the first derivative curve at the solidus temperature, recalescence and its relationships to graphite nucleation and shrinkage tendency. The results of thermal analysis in terms of the cooling curve and its derivative parameters, and thorough characterizations of the shrinkage observed in cup castings produced with various melt compositions and inoculation are presented in the current study.FindingsThe proportion of caved surfaces and macro shrinkage porosity defects has been reduced as the carbon equivalent of melt increases from hypoeutectic to a hypereutectic composition. The composition that is slightly hypereutectic has the lowest shrinkage propensity. Although inoculation reduces shrinkage, the importance of this parameter differs depending on the carbon equivalent.Originality/valueThe percentage of macro shrinkage porosity and the angle that the cooling rate curve forms are strongly correlated. It is found that the macro shrinkage size decreases as the angle of the first derivative curve at the solidus temperature is reduced. Further, lower macroporosity is produced by a metal that has a higher nodule count in association with a greater cooling rate toward the end of the solidification process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on effect of carbon equivalent and inoculation on the solidification and shrinkage tendency of ductile cast iron using thermal analysis

Sangame,

Reddy

2023

MMMS

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Simulating Study on the Shrinkage Cavity and Porosity of a Microalloyed Steel Ingot

Wang,

Zhang

2024

steel research int.

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A 3D solidification model coupling heat transfer, solidification, and shrinkage porosity are established. The effect of melting temperature and cooling modes on the solidification time, shrinkage cavity, and porosity is investigated by the simulation. When the melting temperatures are 1510, 1530, and 1550 °C, the depth of the shrinkage cavity changes little, and they are about 44.8 mm. Maximal shrinkage porosity below the shrinkage cavity are 79.0%, 80.5%, and 82.0%, respectively. When the melting temperature is 1570 °C, the depth of the shrinkage cavity increases to 52.7 mm, and the maximal shrinkage porosity below the shrinkage cavity decreases to 75.5%. For three cooling modes, water cooling, air cooling, and furnace cooling, the cooling intensity gradually decreases, the solidification time increases, and the time of complete solidification is 72.0, 218.5, and 1382.2 s, respectively. With the decrease of cooling intensity, the shrinkage cavity shape and depth of the ingot vary obviously, and the depth of the V‐shaped shrinkage cavity is 39.9, 44.6, and 0 mm. The maximal shrinkage porosity is 76.0%, 82.0%, and 90.9%, respectively. Considering solidification time, shrinkage cavity, and porosity, water cooling mode should be used to obtain the dense internal quality of the steel ingot.

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Study on the effect of micro-shrinkage porosity on the ultra-low temperature toughness of ferritic ductile iron

Cited by 2 publications

References 18 publications

Investigation on effect of carbon equivalent and inoculation on the solidification and shrinkage tendency of ductile cast iron using thermal analysis

Investigation on effect of carbon equivalent and inoculation on the solidification and shrinkage tendency of ductile cast iron using thermal analysis

Simulating Study on the Shrinkage Cavity and Porosity of a Microalloyed Steel Ingot

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