Journal of Korea Foundry Society最新文献_第10页

Evaluation on the Efficiency of Cored Wire Feeding in Addition of Alloying Elements into Cu Melt 在铜熔体中添加合金元素的补丝效率评价

Journal of Korea Foundry Society Pub Date : 2013-12-31 DOI: 10.7777/JKFS.2013.33.6.248

Bok-Hyun Kang, Ki-young Kim

引用次数: 0

Analysis of Microstructural Evolution During Directional Solidification of Ni-Base Superalloy CM247LC ni基高温合金CM247LC定向凝固过程中组织演变分析

Journal of Korea Foundry Society Pub Date : 2013-10-31 DOI: 10.7777/JKFS.2013.33.5.193

S. Seo, H. Jeong, D. Yun, Y. Ahn, Je-hyun Lee, Y. Yoo

{"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}

引用次数: 3

Alloy Design and Properties of Ni based Superalloy LESS 1: I. Alloy Design and Phase Stability at High Temperature 镍基高温合金的合金设计与性能LESS 1: 1 .合金设计与高温相稳定性

Journal of Korea Foundry Society Pub Date : 2013-10-31 DOI: 10.7777/JKFS.2013.33.5.215

J. Youn, B. Kang, Bong-Jae Choi, Young-Jig Kim

{"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}

引用次数: 1

Overflow Design Methods of Family Mold for Rotor Using the Flow and Solidification Simulation 基于流动与凝固模拟的转子系列模具溢流设计方法

Journal of Korea Foundry Society Pub Date : 2013-10-31 DOI: 10.7777/JKFS.2013.33.5.204

J. M. Jung, C. W. Kim, V. Nguyen, K. Lee, J. Kuk, H. G. Jin, Sungkil Hong

{"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}

引用次数: 0

Comparison of the Microstructure and Mechanical Property between Gravity Casting Forging and Rheo-diecasting Forging using A356 Alloy A356合金重力铸造锻件与流变压铸锻件组织与力学性能的比较

Journal of Korea Foundry Society Pub Date : 2013-10-31 DOI: 10.7777/JKFS.2013.33.5.210

Junyi Lee, Jae-Yong Lim, Seung-Yong Lee, Seoug-Won Moon, C. Hong

引用次数: 0

Analysis of Eutectic Reaction as a Function of Cooling Rate in High Manganese Flake Graphite Cast Irons 高锰片状石墨铸铁共晶反应随冷却速率的变化规律分析

Journal of Korea Foundry Society Pub Date : 2013-08-31 DOI: 10.7777/JKFS.2013.33.4.162

Sang-Hwan Lee, Hyun-Woo Lee, Sang-Mokk Lee

引用次数: 0

Effects of Alloying Elements on the Properties of High Strength and High Thermal Conductivity Al-Zn-Mg-Fe Alloy for Die Casting 合金元素对高强度高导热铝锌镁铁合金压铸性能的影响

Journal of Korea Foundry Society Pub Date : 2013-08-31 DOI: 10.7777/JKFS.2013.33.4.171

K. Kim, Young-Suk Lim, Jesik Shin, Se-Hyun Ko, Jeong-Min Kim

引用次数: 1

Effects of Organic and Inorganic Binder Core on Microstructure and Mechanical Properties of Al Casting Products 有机和无机粘结剂芯对Al铸件组织和力学性能的影响

Journal of Korea Foundry Society Pub Date : 2013-08-31 DOI: 10.7777/JKFS.2013.33.4.147

Sang-Soo Shin, W. Kim, Eok-Soo Kim, Kyoungmook Lim, J. Park

引用次数: 1

Effect of Processing Parameters on Direct Fabrication of Polycrystalline Silicon Wafer 工艺参数对直接制备多晶硅片的影响

Journal of Korea Foundry Society Pub Date : 2013-08-31 DOI: 10.7777/JKFS.2013.33.4.157

Sungjin Wi, Jinseok Lee, B. Jang, Joon-soo Kim, Y. Ahn, W. Yoon

{"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}

引用次数: 0

Effects of Zn and Mg Amounts on the Properties of High Thermal Conductivity Al-Zn-Mg-Fe Alloys for Die Casting Zn和Mg用量对压铸用高导热Al-Zn-Mg-Fe合金性能的影响

Journal of Korea Foundry Society Pub Date : 2013-06-30 DOI: 10.7777/JKFS.2013.33.3.113

K. Kim, Young-Suk Lim, Jesik Shin, Se-Hyun Ko, Jeong-Min Kim

引用次数: 3