Investigation of Dendrite Coarsening in Complex Shaped Lamellar Graphite Iron Castings

被引:5
|
作者
Svidro, Peter [1 ]
Dioszegi, Attila [1 ]
Pour, Mohsen Saffari [2 ]
Jonsson, Par [2 ]
机构
[1] Jonkoping Univ, Dept Mat & Mfg Foundry Technol, S-55111 Jonkoping, Sweden
[2] KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden
关键词
lamellar cast iron; primary austenite; dendrite morphology; coarsening; shrinkage porosity (SP); metal expansion penetration (MEP); SOLIDIFICATION;
D O I
10.3390/met7070244
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Shrinkage porosity and metal expansion penetration are two casting defects that appear frequently during the production of complex-shaped lamellar graphite iron components. These casting defects are formed during the solidification and usually form in the part of the casting which solidifies last. The position of the area that solidifies last is dependent on the thermal conditions. Test castings with thermal conditions like those existing in a complex-shaped casting were successfully applied to provoke a shrinkage porosity defect and a metal expansion penetration defect. The investigation of the primary dendrite morphology in the defected positions indicates a maximum intradendritic space, where the shrinkage porosity and metal expansion penetration defects appear. Moving away from the defect formation area, the intradendritic space decreases. A comparison of the intradendritic space with the simulated local solidification times indicates a strong relationship, which can be explained by the dynamic coarsening process. More specifically, long local solidification times facilitates the formation of a locally coarsened austenite morphology. This, in turn, enables the formation of a shrinkage porosity or a metal expansion penetration.
引用
收藏
页数:15
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