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Industrial development of gas induced semi-solid process 被引量:10
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作者 S.THANABUMRUNGKUL S.JANUDOM +2 位作者 R.BURAPA P.DULYAPRAPHANT J.WANNASIN 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期1016-1021,共6页
The gas induced semi-solid(GISS) is a rheocasting process that produces semi-solid slurry by applying fine gas bubble injection through a graphite diffuser.The process is developed to be used in the die casting indust... The gas induced semi-solid(GISS) is a rheocasting process that produces semi-solid slurry by applying fine gas bubble injection through a graphite diffuser.The process is developed to be used in the die casting industry.To 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 modifications.The commercial parts are developed and produced by the GISS die casting process.The GISS die casting shows the feasibility to produce industrial parts with aluminum 7075 and A356 with lower porosity than liquid die casting. 展开更多
关键词 gas induced semi-solid(giss) RHEOCASTING DIE CASTING semi-solid metal INDUSTRIAL applications
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Research and development of gas induced semi-solid process for industrial applications 被引量:9
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作者 J.WANNASIN S.JANUDOM +4 位作者 T.RATTANOCHAIKUL R.CANYOOK R.BURAPA T.CHUCHEEP S.THANABUMRUNGKUL 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期1010-1015,共6页
Several rheocasting processes are developed or applied worldwide in the metal forming industry.One of the new rheocasting processes is the gas induced semi-solid(GISS) process.The GISS process utilizes the principle o... Several rheocasting processes are developed or applied worldwide in the metal forming industry.One of the new rheocasting processes is the gas induced semi-solid(GISS) process.The GISS process utilizes the principle of rapid heat extraction and vigorous local extraction using the injection of fine gas bubbles through a graphite diffuser.Several 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 conducted.The GISS process is capable of processing various alloys including cast aluminum alloys,die casting aluminum alloys,wrought aluminum alloys,and zinc alloys.The 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 parts.The research and development activities of the GISS process were discussed and the status of the industrial developments of this process was reported. 展开更多
关键词 gas induced semi-solid RHEOCASTING DIE CASTING FORMATION mechanism INDUSTRIAL applications
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Semi-solid gravity sand casting using gas induced semi-solid process 被引量:3
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作者 T.CHUCHEEP R.BURAPA +2 位作者 S.JANUDOM S.WISUTMETHANGOON J.WANNASIN 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期981-987,共7页
The semi-solid metal forming using high pressures has been applied for several years.In contrast,low pressure casting,such as gravity sand casting,has not been widely studied even though it may help reduce porosity de... The semi-solid metal forming using high pressures has been applied for several years.In 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 investigated.The results show that the process can produce complete parts with no observable defects.The ultimate tensile strength and elongation data of semi-solid cast samples are higher than those of the liquid cast samples.In addition,the semi-solid sand casting process gives a better casting yield.It can be concluded that the semi-solid sand casting of an aluminum alloy using the GISS process is a feasible process. 展开更多
关键词 GRAVITY SAND CASTING semi-solid SAND CAST Al7Si0.3MgFe gas induced semi-solid
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Evolution of microstructure in semi-solid slurries of rheocast aluminum alloy 被引量:11
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作者 R.CANYOOK S.PETSUT +2 位作者 S.WISUTMETHA NGOON M.C.FLEMINGS J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1649-1655,共7页
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 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. 展开更多
关键词 microstructure evolution RHEOCASTING rapid quenching method 356 aluminum alloy gas induced semi-solid giss formation mechanism
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Feasibility of semi-solid die casting of ADC12 aluminum alloy 被引量:9
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作者 S.JANUDOM T.RATTANOCHAIKUL +2 位作者 R.BURA PA S.WISUTMETHANGOON J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1756-1762,共7页
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 ar... 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. 展开更多
关键词 ADC12 aluminum alloys semi-solid die casting gas induced semi-solid giss RHEOCASTING
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Effects of primary phase morphology on mechanical properties of Al-Si-Mg-Fe alloy in semi-solid slurry casting process 被引量:3
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作者 R.BURAPA S.JANUDOM +2 位作者 T.CHUCHEEP R.CANYOOK J.WANNASIN 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期857-861,共5页
The gas induced semi-solid(GISS) process was developed to create semi-solid slurry with fine and uniform globular structure.The combination of local rapid heat extraction and vigorous agitation by the injection of fin... The gas induced semi-solid(GISS) process was developed to create semi-solid slurry with fine and uniform globular structure.The 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 globular.The GISS process produced semi-solid slurry at low solid fractions and then formed the slurry by a squeeze casting process to produce casting parts.The effects of primary phase morphology on the mechanical properties of Al-Si-Mg-Fe alloy were investigated.The results show that the ultimate tensile strength and elongation are affected by the shape factor and particle size of the primary α(Al). 展开更多
关键词 gas induced semi-solid(giss) microstructure MECHANICAL properties semi-solid SLURRY casting RHEOCASTING
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Development of aluminum rheo-extrusion process using semi-solid slurry at low solid fraction 被引量:2
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作者 T.RATTANOCHAIKUL S.JANUDOM +1 位作者 N.MEMONGKOL J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1763-1768,共6页
An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. However, this process has a high production cost due to the need for investment of high-pressure machinery... An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. However, this process has a high production cost due to the need for investment of high-pressure machinery. The objective of this work is to develop a new semi-solid extrusion process using semi-solid slurry at low solid fractions. A laboratory extrusion system was used to fabricate aluminum rods with the diameter of 12 ram. The semi-solid metal process used in this study was the gas induced semi-solid (GISS) technique. To study the feasibility of the GISS extrusion process, the effects of extrusion parameters such as plunger speed and solid fi-action on the extrudability, microstructure, and mechanical properties of extruded samples were investigated. The results show that the plunger speed and solid fraction of the semi-solid metal need to be carefully controlled to produce complete extruded parts. 展开更多
关键词 aluminum alloys EXTRUSION semi-solid metal rheo-extrusion gas induced semi-solid giss
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