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Determining casting defects in near-net shape casting aluminum parts by computed tomography

Frontiers of Mechanical Engineering 2018年第1期13卷 48-52页

作者： Jiehua LI bernd oberdorfer Daniel HABE Peter SCHUMACHER Institute of Casting Research Montanuniversitat Leoben LeobenA-8700 Austria Austrian Foundry Research Institute Leoben A-8700 Austria

Three types of near-net shape casting alumi- num 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, A1-7Si-0.3Mg）, and semi-solid casting （A356, A1-TSi-0.3Mg）, respectively. Unlike die casting （second part）, low-pressure die casting （first part） sig- nificantly 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.

关键词： near-net shape casting aluminum parts cast-ing defects low pressure die casting die casting semi-solidcasting computed tomography

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ORGANIC CARBON STOCKS IN A SILTY TEXTURED SOIL FOLLOWING REINTEGRATION OF A 20 YEARS OLD MISCANTHUS×GIGANTEUS SITE INTO A CROP ROTATION

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Frontiers of Agricultural Science and Engineering 2023年第2期10卷 183-197页

作者： Lisa ESSICH Reiner RUSER Jens HARTUNG Anne HANEMANN Meike GASSNER Liam oberdorfer Jörn BREUER Jürgen RECKNAGEL Helmut NUßBAUMER Torsten MÜLLER Institute of Crop Science Department Fertilization and Soil Matter DynamicsUniversity of Hohenheim70599 StuttgartGermany Institute of Crop Science Biostatistics UnitUniversity of Hohenheim70599 StuttgartGermany Center for Agricultural Technology Augustenberg(LTZ) 76227 KarlsruheGermany

Miscanthus×giganteus may play an important role in replacing fossil energy resources by bio-based *** further advantage of miscanthus production is the generally high soil organic carbon(C_(org))enrichment in *** to declining yields,miscanthus stocks are commonly reintegrated into crop rotation after approximately 20 *** there is only few information,whether these high amounts of(C_(org))can be conserved while intensifying soil tillage and crop management after ***,we monitored(C_(org))stocks in a control with more than 20 years of continuous miscanthus and in a treatment with reintegration of a 20-years old miscanthus stock into an organic crop *** onδ^(13)C soil values,we calculated an annual(C_(org))enrichment of 0.98 Mg·ha^(-1)·yr^(-1)C under *** than 95%of the miscanthus-C was determined in the upper 0.25 m of *** miscanthus cultivation did not affect yields during the first five extension years and(C_(org))stocks increased *** reintegration,(C_(org))stocks remained constant during five years,which was mainly attributed to the humification and/or stabilization of high amounts of destroyed roots and rhizomes.A significant decrease in(C_(org))(-5.7 Mg·ha^(-1)C)compared to the continuing miscanthus cultivation was at first measured six years after reintegration into crop rotation,underlining the need of long-term *** data also show,that miscanthus production cycles can be extended in our region,and that sowing of the alfalfa grass mixture after rhizome/root destruction was efficient in preserving(C_(org))stocks for at least first five years after reintegration.

关键词： biobased energy crops C balance humus accumulation

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