Frontiers of Mechanical Engineering >
Determining casting defects in near-net shape casting aluminum parts by computed tomography
Received date: 27 Mar 2017
Accepted date: 27 Sep 2017
Published date: 23 Jan 2018
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Three types of near-net shape casting aluminum parts were investigated by computed tomography to determine casting defects and evaluate quality. The first, second, and third parts were produced by low-pressure die casting (Al-12Si-0.8Cu-0.5Fe-0.9Mg-0.7Ni-0.2Zn alloy), die casting (A356, Al-7Si-0.3Mg), and semi-solid casting (A356, Al-7Si-0.3Mg), respectively. Unlike die casting (second part), low-pressure die casting (first part) significantly reduced the formation of casting defects (i.e., porosity) due to its smooth filling and solidification under pressure. No significant casting defect was observed in the third part, and this absence of defects indicates that semi-solid casting could produce high-quality near-net shape casting aluminum parts. Moreover, casting defects were mostly distributed along the eutectic grain boundaries. This finding reveals that refinement of eutectic grains is necessary to optimize the distribution of casting defects and reduce their size. This investigation demonstrated that computed tomography is an efficient method to determine casting defects in near-net shape casting aluminum parts.
Jiehua LI , Bernd OBERDORFER , Daniel HABE , Peter SCHUMACHER . Determining casting defects in near-net shape casting aluminum parts by computed tomography[J]. Frontiers of Mechanical Engineering, 2018 , 13(1) : 48 -52 . DOI: 10.1007/s11465-018-0493-y
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