Pub Date : 2013-12-31DOI: 10.7777/JKFS.2013.33.6.248
Bok-Hyun Kang, Ki-young Kim
To add alloying elements into a pure copper melt, the wire-feeding efficiency of cored (alloy containing) wire was evaluated using a commercial, computational fluid-dynamics program. The model design was based on an industrial-scale production line. The variables calculated included wire feed rate, melt temperature, wire diameter, melt flow rate and wire temperature. Efficiency was evaluated after a series of calculations based on the penetration depth of the alloy-wire into the molten copper bath. Of the five variables investigated, the wire feed rate and wire diameter were the most influential factors affecting the feeding efficiency of the cored-wire.
{"title":"Evaluation on the Efficiency of Cored Wire Feeding in Addition of Alloying Elements into Cu Melt","authors":"Bok-Hyun Kang, Ki-young Kim","doi":"10.7777/JKFS.2013.33.6.248","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.6.248","url":null,"abstract":"To add alloying elements into a pure copper melt, the wire-feeding efficiency of cored (alloy containing) wire was evaluated using a commercial, computational fluid-dynamics program. The model design was based on an industrial-scale production line. The variables calculated included wire feed rate, melt temperature, wire diameter, melt flow rate and wire temperature. Efficiency was evaluated after a series of calculations based on the penetration depth of the alloy-wire into the molten copper bath. Of the five variables investigated, the wire feed rate and wire diameter were the most influential factors affecting the feeding efficiency of the cored-wire.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"346 1","pages":"248-253"},"PeriodicalIF":0.0,"publicationDate":"2013-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88064174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-31DOI: 10.7777/JKFS.2013.33.5.193
S. Seo, H. Jeong, D. Yun, Y. Ahn, Je-hyun Lee, Y. Yoo
The Ni-base superalloy CM247LC was directionally solidified (DS) using the Bridgman-type furnace to understand the effect of the chill plate on the microstructural evolution, such as dendrite arm spacing, microporosity, and MC-type carbide. The DS process was also modeled by the PROCAST to predict the solidification rate, thermal gradient, and resultant cooling rate in the entire length of the DS specimen. Due to the quenching effects of chill plate, four distinct areas were found to form in the specimen, in which the solidification rate was changed, during DS at a given withdrawal rate of 0.083 mm/s. Among the microstructural features investigated, the dendrite arm spacings and average size of the MC-type carbide near the chill plate were found to be influenced by the quenching effect of the chill plate. However, no significant influence was found on the size and volume fraction of microporosity, and the volume fraction of the MC-type carbide. The relationship between the microstructural features and the solidification variables was also analyzed and discussed on the basis of a combination of experimental and modeling results.
{"title":"Analysis of Microstructural Evolution During Directional Solidification of Ni-Base Superalloy CM247LC","authors":"S. Seo, H. Jeong, D. Yun, Y. Ahn, Je-hyun Lee, Y. Yoo","doi":"10.7777/JKFS.2013.33.5.193","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.5.193","url":null,"abstract":"The Ni-base superalloy CM247LC was directionally solidified (DS) using the Bridgman-type furnace to understand the effect of the chill plate on the microstructural evolution, such as dendrite arm spacing, microporosity, and MC-type carbide. The DS process was also modeled by the PROCAST to predict the solidification rate, thermal gradient, and resultant cooling rate in the entire length of the DS specimen. Due to the quenching effects of chill plate, four distinct areas were found to form in the specimen, in which the solidification rate was changed, during DS at a given withdrawal rate of 0.083 mm/s. Among the microstructural features investigated, the dendrite arm spacings and average size of the MC-type carbide near the chill plate were found to be influenced by the quenching effect of the chill plate. However, no significant influence was found on the size and volume fraction of microporosity, and the volume fraction of the MC-type carbide. The relationship between the microstructural features and the solidification variables was also analyzed and discussed on the basis of a combination of experimental and modeling results.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"9 1","pages":"193-203"},"PeriodicalIF":0.0,"publicationDate":"2013-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75256230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-31DOI: 10.7777/JKFS.2013.33.5.215
J. Youn, B. Kang, Bong-Jae Choi, Young-Jig Kim
The alloys required for fossil power plants are altered from stainless steel that has been used below 600oC to Ni-based alloys that can operate at 700oC for Hyper Super Critical (HSC) steam turbine. The IN740 alloy (Special Metals Co. USA) is proposed for improved rupture strength and corrosion resistance at high temperature. However, previous studies with experiments and simulations on stable phases at about 700oC indicated the formation of the eta phase with the wasting of a gamma prime phase, which is the most important reinforced phase in precipitation hardened Ni alloys, and this resulted in the formation of precipitation free zones to decrease the strength. On the basis of thermodynamic calculation, the new Ni-based superalloy named LESS 1 (Low Eta Sigma Superalloy) was designed in this study to improve the strengthening effect and structure stability by depressing the formation of topologically close packed phases, especially sigma and eta phases at high temperature. A thermal exposure test was carried out to determine the microstructure stability of LESS 1 in comparison with IN740 at 800oC for 300 hrs. The experimental results show that a needle-shaped eta phase was formed in the grin boundary and it grew to intragrain, and a precipitation free zone was also observed in IN740, but these defects were entirely controlled in LESS 1.
{"title":"Alloy Design and Properties of Ni based Superalloy LESS 1: I. Alloy Design and Phase Stability at High Temperature","authors":"J. Youn, B. Kang, Bong-Jae Choi, Young-Jig Kim","doi":"10.7777/JKFS.2013.33.5.215","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.5.215","url":null,"abstract":"The alloys required for fossil power plants are altered from stainless steel that has been used below 600oC to Ni-based alloys that can operate at 700oC for Hyper Super Critical (HSC) steam turbine. The IN740 alloy (Special Metals Co. USA) is proposed for improved rupture strength and corrosion resistance at high temperature. However, previous studies with experiments and simulations on stable phases at about 700oC indicated the formation of the eta phase with the wasting of a gamma prime phase, which is the most important reinforced phase in precipitation hardened Ni alloys, and this resulted in the formation of precipitation free zones to decrease the strength. On the basis of thermodynamic calculation, the new Ni-based superalloy named LESS 1 (Low Eta Sigma Superalloy) was designed in this study to improve the strengthening effect and structure stability by depressing the formation of topologically close packed phases, especially sigma and eta phases at high temperature. A thermal exposure test was carried out to determine the microstructure stability of LESS 1 in comparison with IN740 at 800oC for 300 hrs. The experimental results show that a needle-shaped eta phase was formed in the grin boundary and it grew to intragrain, and a precipitation free zone was also observed in IN740, but these defects were entirely controlled in LESS 1.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"33 1","pages":"215-225"},"PeriodicalIF":0.0,"publicationDate":"2013-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87199286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-31DOI: 10.7777/JKFS.2013.33.5.204
J. M. Jung, C. W. Kim, V. Nguyen, K. Lee, J. Kuk, H. G. Jin, Sungkil Hong
Abstract The family mold casting have advantages which are able to make products with different shapes and dimensions simultaneouslyin a single mold. In this study, the design of the 4 cavity rotor family mold was used by “Anycasting” software, the defectsoccurred during die casting were predicted and suggested the best optimization conditions for sound products. The result of theexperiment were that the optimum overflow design was needed for gas emission and control of residual oxides. It was clear that thedefects positions formed by diecasting were agreed with nearly them predicted by simulation.Key words: Family mold, Die casting, Filling aspect, Solidification aspect, Oxide distribution 1. 서 론 패밀리 금형은 하나의 금형에서 다양한 형상과 치수를 가진제품을 생산할 수 있는 금형으로 다품종 소량 생산 방식에 적합하다. 현재 가전 및 산업분야에서 사용되는 모터 회전자(Rotor)는 대부분 다이캐스팅 공정으로 생산되며[1], 크기가 작은 회전자 생산의 경우 다품종 소량 생산을 위한 패밀리 금형의 다이캐스팅 기술이 요구되고 있다. 그러나 다이캐스팅 공정에서 용탕에 의해 슬리브(Sleeve)가 완전히 충전되지 않은 상태로 가스와 함께 캐비티(Cavity)에 주입되기 때문에 주물 내에 기공과 산화물이 형성되어 불량의 원인이 되고 있다[2]. 이러한 현상은 가스와 산화물 배출을 원활하게 할 수 있는 오버플로우(Overflow) 및 가스 벤트의 설계 등을 통해 제어하여야한다[3].이러한 문제들을 개선하기 위해 CAE (Computer AidedEngineering)기술을 다이캐스팅 금형 설계 분야에 적용함으로써금형 내에 용탕이 충전, 응고되는 과정에서 발생하는 유동 및응고 현상을 시뮬레이션을 통해 예측하여 금형 설계에 이용하기 위한 연구가 활발히 진행되고 있다[4-9].따라서 본 연구에서는 4 캐비티 회전자 패밀리 금형의 오버플로우 설계를 위해 2가지 오버플로우 타입을 적용하였고, 다이캐스팅 시 유동 및 응고 양상, 산화물 분포 등의 시뮬레이션분석을 통해 결함을 예측하고 해석 결과를 바탕으로 오버플로우 설계 방안을 도출하였다. 또한 충전율 계산과 X-Ray CT촬영을 통해 시뮬레이션에서 예측한 결과와 비교 분석하였다.
Abstract The family mold casting have advantages which are able to make products with different shapes and dimensions simultaneouslyin a single mold。In this study, the design of the 4 cavity rotor family mold was used by " Anycasting " softwarethe defectsoccurred during die casting were predicted and suggested the best optimization conditions for sound products。The result of theexperiment were that The optimum overflow design was needed for gas emission and control of residual oxides。It was clear that thedefects positions formed by diecasting were agreed with nearly them predicted by simulation。Key words: Family mold, Die casting, Filling aspect, Solidification aspect, Oxide distribution 1。瑞伦家庭铸造模型是一种可以在一个铸造模型中生产出多种形状和尺寸的产品的铸造模型，适合多品种少量生产方式。目前家电及产业领域使用的马达转子大多采用压铸工程生产[1]，生产体积小的转子需要家庭铸造模型的压铸技术，以便多品种少量生产。但在浇铸工程中，由于溶洞在未完全充电的情况下与气体一起注入到Cavity中，铸件内形成气孔和氧化物，成为不良原因[2]。这种现象应通过灵活排放气体和氧化物的Overflow及气体阀的设计等进行控制[3]。为了改善这些问题,法国(computer aidedengineering)技术运用于压铸模具设计领域,使模具内用汤充电、凝固的过程中产生的流动性及凝固现象,通过模拟预测,为了利用在模具设计的研究也在活跃地进行着[4 - 9]。因此,本研究中对4转子包含卡维生素家族为模具的溢流设计采用了两种溢出类型,、压铸时流动性以及凝固现象,氧化物分布等的模拟分析结果为基础,通过缺陷预测和解释溢流引出了设计方案。通过充填率计算和X光CT扫描，与模拟预测结果进行比较分析。
{"title":"Overflow Design Methods of Family Mold for Rotor Using the Flow and Solidification Simulation","authors":"J. M. Jung, C. W. Kim, V. Nguyen, K. Lee, J. Kuk, H. G. Jin, Sungkil Hong","doi":"10.7777/JKFS.2013.33.5.204","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.5.204","url":null,"abstract":"Abstract The family mold casting have advantages which are able to make products with different shapes and dimensions simultaneouslyin a single mold. In this study, the design of the 4 cavity rotor family mold was used by “Anycasting” software, the defectsoccurred during die casting were predicted and suggested the best optimization conditions for sound products. The result of theexperiment were that the optimum overflow design was needed for gas emission and control of residual oxides. It was clear that thedefects positions formed by diecasting were agreed with nearly them predicted by simulation.Key words: Family mold, Die casting, Filling aspect, Solidification aspect, Oxide distribution 1. 서 론 패밀리 금형은 하나의 금형에서 다양한 형상과 치수를 가진제품을 생산할 수 있는 금형으로 다품종 소량 생산 방식에 적합하다. 현재 가전 및 산업분야에서 사용되는 모터 회전자(Rotor)는 대부분 다이캐스팅 공정으로 생산되며[1], 크기가 작은 회전자 생산의 경우 다품종 소량 생산을 위한 패밀리 금형의 다이캐스팅 기술이 요구되고 있다. 그러나 다이캐스팅 공정에서 용탕에 의해 슬리브(Sleeve)가 완전히 충전되지 않은 상태로 가스와 함께 캐비티(Cavity)에 주입되기 때문에 주물 내에 기공과 산화물이 형성되어 불량의 원인이 되고 있다[2]. 이러한 현상은 가스와 산화물 배출을 원활하게 할 수 있는 오버플로우(Overflow) 및 가스 벤트의 설계 등을 통해 제어하여야한다[3].이러한 문제들을 개선하기 위해 CAE (Computer AidedEngineering)기술을 다이캐스팅 금형 설계 분야에 적용함으로써금형 내에 용탕이 충전, 응고되는 과정에서 발생하는 유동 및응고 현상을 시뮬레이션을 통해 예측하여 금형 설계에 이용하기 위한 연구가 활발히 진행되고 있다[4-9].따라서 본 연구에서는 4 캐비티 회전자 패밀리 금형의 오버플로우 설계를 위해 2가지 오버플로우 타입을 적용하였고, 다이캐스팅 시 유동 및 응고 양상, 산화물 분포 등의 시뮬레이션분석을 통해 결함을 예측하고 해석 결과를 바탕으로 오버플로우 설계 방안을 도출하였다. 또한 충전율 계산과 X-Ray CT촬영을 통해 시뮬레이션에서 예측한 결과와 비교 분석하였다.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"166 1","pages":"204-209"},"PeriodicalIF":0.0,"publicationDate":"2013-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74384668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-31DOI: 10.7777/JKFS.2013.33.5.210
Junyi Lee, Jae-Yong Lim, Seung-Yong Lee, Seoug-Won Moon, C. Hong
Recently, the automotive industry has replaced cast iron to lightweight materials like aluminum for engine efficiency of automobiles and an emission control by government. In this paper we studied two auto parts manufacturing methods using an alloy of A356. That is gravity casting and H-NCM Rheo-diecasting forging. We analyzed the microstructure and mechanical properties for this method. In Microstructure analysis results, H-NCM Rheo-diecasting forging has more finer microstrucre and better forging effect. Resulting in better mechanical properties than gravity forging.
{"title":"Comparison of the Microstructure and Mechanical Property between Gravity Casting Forging and Rheo-diecasting Forging using A356 Alloy","authors":"Junyi Lee, Jae-Yong Lim, Seung-Yong Lee, Seoug-Won Moon, C. Hong","doi":"10.7777/JKFS.2013.33.5.210","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.5.210","url":null,"abstract":"Recently, the automotive industry has replaced cast iron to lightweight materials like aluminum for engine efficiency of automobiles and an emission control by government. In this paper we studied two auto parts manufacturing methods using an alloy of A356. That is gravity casting and H-NCM Rheo-diecasting forging. We analyzed the microstructure and mechanical properties for this method. In Microstructure analysis results, H-NCM Rheo-diecasting forging has more finer microstrucre and better forging effect. Resulting in better mechanical properties than gravity forging.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"29 1","pages":"210-214"},"PeriodicalIF":0.0,"publicationDate":"2013-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84297422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-08-31DOI: 10.7777/JKFS.2013.33.4.162
Sang-Hwan Lee, Hyun-Woo Lee, Sang-Mokk Lee
The effects of Mn content and cooling rate on the eutectic reaction of flake graphite cast irons were studied by a combined analysis of macro/micro-structure and cooling curve data. The correlation between the eutectic reaction parameter and macro/microstructure was systematically investigated. Two sets of chemical compositions with different Mn contents were designed to cast. Three types of molds for cylindrical specimens with different diameters were prepared to analyze the cooling rate effect. The difference between undercooling temperature and cementite eutectic temperature (${Delta}T_1
{"title":"Analysis of Eutectic Reaction as a Function of Cooling Rate in High Manganese Flake Graphite Cast Irons","authors":"Sang-Hwan Lee, Hyun-Woo Lee, Sang-Mokk Lee","doi":"10.7777/JKFS.2013.33.4.162","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.4.162","url":null,"abstract":"The effects of Mn content and cooling rate on the eutectic reaction of flake graphite cast irons were studied by a combined analysis of macro/micro-structure and cooling curve data. The correlation between the eutectic reaction parameter and macro/microstructure was systematically investigated. Two sets of chemical compositions with different Mn contents were designed to cast. Three types of molds for cylindrical specimens with different diameters were prepared to analyze the cooling rate effect. The difference between undercooling temperature and cementite eutectic temperature (${Delta}T_1","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"259 1","pages":"162-170"},"PeriodicalIF":0.0,"publicationDate":"2013-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76299170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-08-31DOI: 10.7777/JKFS.2013.33.4.171
K. Kim, Young-Suk Lim, Jesik Shin, Se-Hyun Ko, Jeong-Min Kim
The effects of alloying elements on the solidification characteristics, microstructure, thermal conductivity, and tensile strength of Al-Zn-Mg-Fe alloys were investigated for the development of high strength and high thermal conductivity aluminium alloy for die casting. The amounts of Zn and Mg in Al-Zn-Mg-Fe alloys had little effect on the liquidus / solidus temperature, the latent heat for solidification, the energy release for solidification and the fluidity of Al-Zn-Mg-Fe alloys. Thermo-physical modelling of Al-Zn-Mg- Fe alloys by the JMatPro program showed MgZn2, AlCuMgZn and Al3Fe phases in the microstructure of the alloys. Increased amounts of Mg in Al-Zn-Mg-Fe alloys resulted in phase transformation, such as MgZn2 ⇒ MgZn2 + AlCuMgZn ⇒ AlCuMgZn in the microstructure of the alloys. Increased amounts of Zn and Mg in Al-Zn-Mg-Fe alloys resulted in a gradual reduction of the ther- mal conductivity of the alloys. Increased amounts of Zn and Mg in Al-Zn-Mg-Fe alloys had little effect on the tensile strength of the alloys.
{"title":"Effects of Alloying Elements on the Properties of High Strength and High Thermal Conductivity Al-Zn-Mg-Fe Alloy for Die Casting","authors":"K. Kim, Young-Suk Lim, Jesik Shin, Se-Hyun Ko, Jeong-Min Kim","doi":"10.7777/JKFS.2013.33.4.171","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.4.171","url":null,"abstract":"The effects of alloying elements on the solidification characteristics, microstructure, thermal conductivity, and tensile strength of Al-Zn-Mg-Fe alloys were investigated for the development of high strength and high thermal conductivity aluminium alloy for die casting. The amounts of Zn and Mg in Al-Zn-Mg-Fe alloys had little effect on the liquidus / solidus temperature, the latent heat for solidification, the energy release for solidification and the fluidity of Al-Zn-Mg-Fe alloys. Thermo-physical modelling of Al-Zn-Mg- Fe alloys by the JMatPro program showed MgZn2, AlCuMgZn and Al3Fe phases in the microstructure of the alloys. Increased amounts of Mg in Al-Zn-Mg-Fe alloys resulted in phase transformation, such as MgZn2 ⇒ MgZn2 + AlCuMgZn ⇒ AlCuMgZn in the microstructure of the alloys. Increased amounts of Zn and Mg in Al-Zn-Mg-Fe alloys resulted in a gradual reduction of the ther- mal conductivity of the alloys. Increased amounts of Zn and Mg in Al-Zn-Mg-Fe alloys had little effect on the tensile strength of the alloys.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"16 1","pages":"171-180"},"PeriodicalIF":0.0,"publicationDate":"2013-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86863621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-08-31DOI: 10.7777/JKFS.2013.33.4.147
Sang-Soo Shin, W. Kim, Eok-Soo Kim, Kyoungmook Lim, J. Park
The effects of core materials on the microstructure and mechanical properties of Al casting products have been investigated. The Al casting samples and cylinder head were fabricated by using organic and inorganic binder core respectively, and their microstructure and mechanical properties were evaluated. The Al casting samples fabricated by using inorganic core showed the better mechanical properties such as tensile strength and elongation than those of the Al casting samples fabricated by using organic core. That`s because the Al casting samples contained small amount of pore defects and had fine microstructure compared with the Al casting samples fabricated by using organic core. Also, the use of inorganic core effectively reduced harmful gas emission and pollution.
{"title":"Effects of Organic and Inorganic Binder Core on Microstructure and Mechanical Properties of Al Casting Products","authors":"Sang-Soo Shin, W. Kim, Eok-Soo Kim, Kyoungmook Lim, J. Park","doi":"10.7777/JKFS.2013.33.4.147","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.4.147","url":null,"abstract":"The effects of core materials on the microstructure and mechanical properties of Al casting products have been investigated. The Al casting samples and cylinder head were fabricated by using organic and inorganic binder core respectively, and their microstructure and mechanical properties were evaluated. The Al casting samples fabricated by using inorganic core showed the better mechanical properties such as tensile strength and elongation than those of the Al casting samples fabricated by using organic core. That`s because the Al casting samples contained small amount of pore defects and had fine microstructure compared with the Al casting samples fabricated by using organic core. Also, the use of inorganic core effectively reduced harmful gas emission and pollution.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"62 1","pages":"147-156"},"PeriodicalIF":0.0,"publicationDate":"2013-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91028648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-08-31DOI: 10.7777/JKFS.2013.33.4.157
Sungjin Wi, Jinseok Lee, B. Jang, Joon-soo Kim, Y. Ahn, W. Yoon
A ribbon-type polycrystalline silicon wafer was directly fabricated from liquid silicon via a novel technique for both a fast growth rate and large grain size by exploiting gas pressure. Effects of processing parameters such as moving speed of a dummy bar and the length of the solidification zone on continuous casting of the silicon wafer were investigated. Silicon melt extruded from the growth region in the case of a solidification zone with a length of 1cm due to incomplete solidification. In case of a solidification zone wieh a length of 2 cm, on the other hand, continuous casting of the wafer was impossible due to the volume expansion of silicon derived from the liquid-solid transformation in solidification zone. Consequently, the optimal length of the solidification zone was 1.5 cm for maintaining the position of the solid-liquid interface in the solidification zone. The silicon wafer could be continuously casted when the moving speed of the dummy bar was 6 cm/min, but liquid silicon extruded from the growth region without solidification when the moving speed of the dummy bar was 9 cm/min. This was due to a shift of the position of the solid-liquid interface from the solidification zone to the moving area. The present study reports experimental findings on a new direct growth system for obtaining silicon wafers with both high quality and productivity, as a candidate for an alternate route for the fabrication of ribbon-type silicon wafers.
{"title":"Effect of Processing Parameters on Direct Fabrication of Polycrystalline Silicon Wafer","authors":"Sungjin Wi, Jinseok Lee, B. Jang, Joon-soo Kim, Y. Ahn, W. Yoon","doi":"10.7777/JKFS.2013.33.4.157","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.4.157","url":null,"abstract":"A ribbon-type polycrystalline silicon wafer was directly fabricated from liquid silicon via a novel technique for both a fast growth rate and large grain size by exploiting gas pressure. Effects of processing parameters such as moving speed of a dummy bar and the length of the solidification zone on continuous casting of the silicon wafer were investigated. Silicon melt extruded from the growth region in the case of a solidification zone with a length of 1cm due to incomplete solidification. In case of a solidification zone wieh a length of 2 cm, on the other hand, continuous casting of the wafer was impossible due to the volume expansion of silicon derived from the liquid-solid transformation in solidification zone. Consequently, the optimal length of the solidification zone was 1.5 cm for maintaining the position of the solid-liquid interface in the solidification zone. The silicon wafer could be continuously casted when the moving speed of the dummy bar was 6 cm/min, but liquid silicon extruded from the growth region without solidification when the moving speed of the dummy bar was 9 cm/min. This was due to a shift of the position of the solid-liquid interface from the solidification zone to the moving area. The present study reports experimental findings on a new direct growth system for obtaining silicon wafers with both high quality and productivity, as a candidate for an alternate route for the fabrication of ribbon-type silicon wafers.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"7 1","pages":"157-161"},"PeriodicalIF":0.0,"publicationDate":"2013-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84964339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-06-30DOI: 10.7777/JKFS.2013.33.3.113
K. Kim, Young-Suk Lim, Jesik Shin, Se-Hyun Ko, Jeong-Min Kim
The effects of Zn and Mg amounts on the solidification characteristics, microstructure, thermal conductivity and tensile strength of Al-Zn-Mg-Fe alloys were investigated for the development of high thermal conductivity aluminium alloys for die casting. Zn and Mg amounts in Al-Zn-Mg-Fe alloys had a little effect on the liquidus / solidus temperature, the latent heat for solidification and the fluidity of Al-Zn-Mg-Fe alloys. Thermo-physical modelling of Al-Zn-Mg-Fe alloys by JMatPro program showed , AlCuMgZn and Al3Fe phases on microstructure of their alloys. Increase of Zn and Mg amounts in Al-Zn-Mg-Fe alloys resulted in gradual reduction of the thermal conductivity of their alloys. Increase of Mg amounts in Al-2%Zn-Mg-Fe alloys had little effect on the tensile strength of their alloys, but increase of Mg amounts in Al-4%Zn-Mg-Fe alloys resulted in steep increase of the tensile strength of their alloys.
{"title":"Effects of Zn and Mg Amounts on the Properties of High Thermal Conductivity Al-Zn-Mg-Fe Alloys for Die Casting","authors":"K. Kim, Young-Suk Lim, Jesik Shin, Se-Hyun Ko, Jeong-Min Kim","doi":"10.7777/JKFS.2013.33.3.113","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.3.113","url":null,"abstract":"The effects of Zn and Mg amounts on the solidification characteristics, microstructure, thermal conductivity and tensile strength of Al-Zn-Mg-Fe alloys were investigated for the development of high thermal conductivity aluminium alloys for die casting. Zn and Mg amounts in Al-Zn-Mg-Fe alloys had a little effect on the liquidus / solidus temperature, the latent heat for solidification and the fluidity of Al-Zn-Mg-Fe alloys. Thermo-physical modelling of Al-Zn-Mg-Fe alloys by JMatPro program showed , AlCuMgZn and Al3Fe phases on microstructure of their alloys. Increase of Zn and Mg amounts in Al-Zn-Mg-Fe alloys resulted in gradual reduction of the thermal conductivity of their alloys. Increase of Mg amounts in Al-2%Zn-Mg-Fe alloys had little effect on the tensile strength of their alloys, but increase of Mg amounts in Al-4%Zn-Mg-Fe alloys resulted in steep increase of the tensile strength of their alloys.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"12 1","pages":"113-121"},"PeriodicalIF":0.0,"publicationDate":"2013-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91225408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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