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Semi-solid gravity sand casting using gas induced semi-solid process

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中国有色金属学会会刊：英文版 2010年第S3期20卷 981-987页

作者： T.CHUCHEEP R.BURAPA S.jANUDOM S.WISUTMETHANGOON j.wannasin Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla90112Thailand Department of Industrial Engineering Faculty of EngineeringRajamangala University of Technology SrivijayaSongkhla9000 0Thailand Department of Mechanical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla90112Thailand

The semi-solid metal forming using high pressures has been applied for several *** contrast,low pressure casting,such as gravity sand casting,has not been widely studied even though it may help reduce porosity defects and offer a better casting yield.A semi-solid gravity sand casting process using the Gas Induced Semi-Solid process was *** results show that the process can produce complete parts with no observable *** ultimate tensile strength and elongation data of semi-solid cast samples are higher than those of the liquid cast *** addition,the semi-solid sand casting process gives a better casting *** can be concluded that the semi-solid sand casting of an aluminum alloy using the GISS process is a feasible process.

关键词： gravity sand casting semi-solid sand cast Al7Si0.3MgFe gas induced semi-solid

Industrial development of gas induced semi-solid process

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中国有色金属学会会刊：英文版 2010年第S3期20卷 1016-1021页

作者： S.THANABUMRUNGKUL S.jANUDOM R.BURAPA P.DULYAPRAPHANT j.wannasin Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University Department of Industrial Engineering Faculty of EngineeringRajamangala University of Technology Srivijaya National Metal and Materials Technology Center Thailand Science ParkKlong LuangPathumthani 12120Thailand

The gas induced semi-solid(GISS) is a rheocasting process that produces semi-solid slurry by applying fine gas bubble injection through a graphite *** process is developed to be used in the die casting *** apply the GISS process with a die casting process,a GISS maker unit is designed and attached to a conventional die casting machine with little *** commercial parts are developed and produced by the GISS die casting *** GISS die casting shows the feasibility to produce industrial parts with aluminum 7075 and A356 with lower porosity than liquid die casting.

关键词： gas induced semi-solid(GISS) rheocasting die casting semi-solid metal industrial applications

Effects of primary phase morphology on mechanical properties of Al-Si-Mg-Fe alloy in semi-solid slurry casting process

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中国有色金属学会会刊：英文版 2010年第S3期20卷 857-861页

作者： R.BURAPA S.jANUDOM T.CHUCHEEP R.CANYOOK j.wannasin Department of Industrial Engineering Faculty of EngineeringRajamangala University of Technology Srivijaya Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University

The gas induced semi-solid(GISS) process was developed to create semi-solid slurry with fine and uniform globular *** combination of local rapid heat extraction and vigorous agitation by the injection of fine inert gas bubbles through a graphite diffuser in molten metal held at a temperature above its liquidus temperature changes the morphology of primary α(Al) from coarse dendritic to rosette-like and finally to fine *** GISS process produced semi-solid slurry at low solid fractions and then formed the slurry by a squeeze casting process to produce casting *** effects of primary phase morphology on the mechanical properties of Al-Si-Mg-Fe alloy were *** results show that the ultimate tensile strength and elongation are affected by the shape factor and particle size of the primary α(Al).

关键词： gas induced semi-solid(GISS) microstructure mechanical properties semi-solid slurry casting rheocasting

Feasibility of semi-solid die casting of ADC12 aluminum alloy

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1756-1762页

作者： S.jANUDOM T.RATTANOCHAIKUL R.BURA PA S.WISUTMETHANGOON j.wannasin Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University Department of Industrial Engineering Faculty of Engineering Rajamangala University of Technology Srivijaya Department of Mechanical Engineering Faculty of EngineeringPrince of Songkla University

The feasibility of semi-solid die casting of ADC12 aluminum alloy was studied. The effects of plunger speed, gate thickness, and solid fraction of the slurry on the defects were determined. The defects investigated are gas and shrinkage porosity. In the experiments, semi-solid slurry was prepared by the gas-induced semi-solid （GISS） technique. Then, the slurry was transferred to the shot sleeve and injected into the die. The die and shot sleeve temperatures were kept at 180 ℃ and 250 ℃, respectively. The results show that the samples produced by the GISS die casting give little porosity, no blister and uniform microstructure. From all the results, it can be concluded that the GISS process is feasible to apply in the ADC12 aluminum die casting process. In addition, the GISS process can give improved properties such as decreased porosity and increased microstructure uniformity.

关键词： ADC12 aluminum alloys semi-solid die casting gas induced semi-solid (GISS) rheocasting

Evolution of microstructure in semi-solid slurries of rheocast aluminum alloy

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1649-1655页

作者： R.CANYOOK S.PETSUT S.WISUTMETHA NGOON M.C.FLEMINGS j.wannasin Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University Department of Mechanical Engineering Faculty of EngineeringPrince of Songkla University Department of Materials Science and Engineering Massachusetts Institute of Technology

Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in semi-solid slurries for the control of the theological behavior in semi-solid state. An experimental apparatus was developed which can capture the grain structure at different times at early stages to understand how the semi-solid structure evolves. In this technique, semi-solid slurry was produced by injecting fine gas bubbles into the melt through a graphite diffuser during solidification. Then, a copper quenching mold was used to draw some semi-solid slurry into a thin channel. The semi-solid slurry was then rapidly frozen in the channel giving the microstructure of the slurry at the desired time. Samples of semi-solid 356 aluminum alloy were taken at different gas injection times of 1, 5, 10, 15, 20, 30, 35, 40, and 45 s. Analysis of the microstructure suggests that the fragmentation by remelting mechanism should be responsible for the formation of globular structure in this rheocasting process.

关键词： microstructure evolution rheocasting rapid quenching method 356 aluminum alloy gas induced semi-solid (GISS) formation mechanism

Research and development of gas induced semi-solid process for industrial applications

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中国有色金属学会会刊：英文版 2010年第S3期20卷 1010-1015页

作者： j.wannasin S.jANUDOM T.RATTANOCHAIKUL R.CANYOOK R.BURAPA T.CHUCHEEP S.THANABUMRUNGKUL Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University Department of Industrial Engineering Faculty of EngineeringRajamangala University of Technology Srivijaya

Several rheocasting processes are developed or applied worldwide in the metal forming *** of the new rheocasting processes is the gas induced semi-solid(GISS) *** GISS process utilizes the principle of rapid heat extraction and vigorous local extraction using the injection of fine gas bubbles through a graphite *** forming processes such as die casting,squeeze casting,gravity casting,and rheo-extrusion of the semi-solid slurries prepared by the GISS process have also been *** GISS process is capable of processing various alloys including cast aluminum alloys,die casting aluminum alloys,wrought aluminum alloys,and zinc *** GISS process is currently developed to be used commercially in the industry with the focus on forming semi-solid slurries containing low fractions solid(< 0.25) into *** research and development activities of the GISS process were discussed and the status of the industrial developments of this process was reported.

关键词： gas induced semi-solid rheocasting die casting formation mechanism industrial applications