Macro porosity prediction of SG iron castings considering microstructure formation

Zhao, Haidong; Liu, B.; Ohnaka, Itsuo

doi:10.1080/13640461.2003.11819504

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…In the simulation, when liquid fraction of a mesh was less than a critical fraction (set to 0.3), since liquid in the mesh hardly flows, the mesh was removed from the region of feeding flow calculation. As we reported in the former paper [14], the simulation results of both the former model and commercial softwares indicated that porosities would occur in the two side parts of the brake housing component, and with non-destructive detection, porosities were found in the locations of about 20% practical castings. However, the present prediction results in Fig.…”

Section: Porosity Predictionsupporting

confidence: 52%

Prediction of Microstructure and Porosity Formation of Practical Spheroidal Graphite Iron Castings

Zhao

Liu

2010

KEM

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The mathematical model for microstructure formation and porosity prediction during solidification process of SG iron casting was established and applied to a practical brake housing casting. Quantitative microstructure analysis of specimens machined from the castings was compared with the simulation, and the two results are in acceptable agreement on nodule counts and size, pearlite fractions and hardness. It is indicated that the model can calculate the fraction of ferrite and pearlite more accurately, and specially can reflect the effect of both under-cooling during solidification and the nodules formed in eutectic period on the pearlite content. The present porosity prediction was compared with those of a former method and commercial software, which leads to that the current methods used for porosity prediction should be investigated and improved further.

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Section: Porosity Predictionsupporting

confidence: 52%

Prediction of Microstructure and Porosity Formation of Practical Spheroidal Graphite Iron Castings

Zhao

Liu

2010

KEM

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“…In the authors' former research, a method to predict macro porosity of the casting considering microstructure formation was forwarded, and was applied to two practical castings. 4 Unfortunately, the prediction overestimated the porosity contents in an automotive wheel hub SGI casting.…”

Section: Introductionmentioning

confidence: 96%

Simulation of feeding flow and prediction of macro porosity of SGI casting based on microstructure formation

Zhao¹,

Liu²

2007

International Journal of Cast Metals Research

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Based on the model of microstructure formation of spheroidal graphite iron (SGI) casting which includes continuous nucleation and growth of graphite nodules, carbides and austenite, a method was proposed to calculate the feeding flow during solidification processes by considering mass conservation and using Darcy's laws. The method takes into account liquid shrinkage as well as shrinkage and expansion caused by different phase formation, and can calculate the flow in liquid and mushy regions. According to calculation of the flow, macro porosity formation could be described through treating free surfaces and boundary of the regions. The proposed method has been applied to an automotive wheel hub SGI casting with two different processing cases. The feeding flow during the casting solidification with two cases, especially in isolated regions, was investigated and discussed. With the flow calculation, expansion or shrinkage of liquid or mushy regions might be judged, which could offer important information for evaluating formation of macro porosity. The results of macro porosity prediction were compared with results of practical castings. It is indicated that two results were in quite good agreement, and the method could predict macro porosity formation more accurately.

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Microstructure evolution and microhardness of TiAl based alloy blade by vacuum suction casting

Xiao

Cao

et al. 2019

Vacuum

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Macro porosity prediction of SG iron castings considering microstructure formation

Cited by 3 publications

References 4 publications

Prediction of Microstructure and Porosity Formation of Practical Spheroidal Graphite Iron Castings

Prediction of Microstructure and Porosity Formation of Practical Spheroidal Graphite Iron Castings

Simulation of feeding flow and prediction of macro porosity of SGI casting based on microstructure formation

Microstructure evolution and microhardness of TiAl based alloy blade by vacuum suction casting

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