Journal of Korea Foundry Society最新文献_第3页

A Study on the Compressive Properties of Thixo-Extruded 7075 Aluminum Alloy 7075铝合金触敏挤压压缩性能的研究

Journal of Korea Foundry Society Pub Date : 2017-04-30 DOI: 10.7777/jkfs.2017.37.2.38

Dae-hwan Kim, Hyun-Ju Jung, Su-gun Lim

引用次数: 0

Fabrication Technology of Turbo Charger Housing for Riser Minimizing by Fusion S/W Application and its Experimental Investigation 融合S/W减立管涡轮增压器外壳制造技术及实验研究

Journal of Korea Foundry Society Pub Date : 2017-02-28 DOI: 10.7777/JKFS.2017.37.1.1

Hak-Chul Lee, P. Seo, C. Jin, Hyung-Yoon Seo, C. Kang

{"title":"Fabrication Technology of Turbo Charger Housing for Riser Minimizing by Fusion S/W Application and its Experimental Investigation","authors":"Hak-Chul Lee, P. Seo, C. Jin, Hyung-Yoon Seo, C. Kang","doi":"10.7777/JKFS.2017.37.1.1","DOIUrl":"https://doi.org/10.7777/JKFS.2017.37.1.1","url":null,"abstract":"The purpose of this study is to increase the part recovery rate (to more than 70%) during the casting of a ductile cast iron turbo charger housing using a heater around the riser. Before creating a casting mold, various runner and riser systems were designed and analyzed with a casting simulation analysis tool. The design variables were the heater temperature, top insulation, riser location, riser diameter and the riser shape. During the feeding from the riser to the part, the reverse model was better than the forward model. When heating the riser (above 600 o C), solidification of the riser was delayed and the feeding effect was suitable compared to that without heating. At a higher heating temperature, less solidification shrinkage and porosity were noted inside the part. On the basis of a casting simulation, eight molds were fabricated and casting experiments were conducted. According to the experimental conditions, external and internal defects were analyzed and mechanical properties were tested. The ultimate tensile strength and elongation outcome were correspondingly more than 540MPa and 5% after a heat treatment. In addition, a maximum part recovery rate of 86% was achieved in this study.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"54 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79240367","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: 2

Heat Treatment of AZ91-5wt.%Sn Magnesium Alloy AZ91-5wt的热处理。%Sn镁合金

Journal of Korea Foundry Society Pub Date : 2017-02-28 DOI: 10.7777/JKFS.2017.37.1.14

Dae-hwan Kim, Su-gun Lim

引用次数: 0

Effect of Tungsten Contents and Heat Treatment on the Microstructures and Mechanical Properties of Hastelloy C-276 Alloy Investment Castings 钨含量及热处理对哈氏C-276合金熔模铸件组织和力学性能的影响

Journal of Korea Foundry Society Pub Date : 2017-02-28 DOI: 10.7777/jkfs.2017.37.1.21

Byung-Ki Yoo, Heung-Il Park, Cha-Hurn Bae, Sung-Gyoo Kim, Hae-Yong Jeong

{"title":"Effect of Tungsten Contents and Heat Treatment on the Microstructures and Mechanical Properties of Hastelloy C-276 Alloy Investment Castings","authors":"Byung-Ki Yoo, Heung-Il Park, Cha-Hurn Bae, Sung-Gyoo Kim, Hae-Yong Jeong","doi":"10.7777/jkfs.2017.37.1.21","DOIUrl":"https://doi.org/10.7777/jkfs.2017.37.1.21","url":null,"abstract":"The effects of W content and heat treatment on the microstructure and mechanical properties of Hastelloy C-276 alloy investment castings were discussed. As the W content was increased, dendritic microstructure was refined and network type precipitate formed during solidification was distributed on the dendritic grain boundaries. Cr, Fe and Mn were highly segregated in the Ni-based dendrite matrix, and Mo, W, C and Si were in the precipitates. Due to the heat treatment, fine granular and flake precipitates were newly formed in the matrix, and unresolved network type precipitates remained on the grain boundary. The network type precipitates and the granular and flake precipitates formed by heat treatment were confirmed to be µ phase intermetallic compounds with similar compositions. Due to the increase of the W content and the heat treatment, hardness and tensile strength were sig-nificantly increased. However, tensile strength after aging treatment was decreased with the W content. These results can be explained in that brittle fracturing by the unresolved network type precipitates dispersed in the grain boundary was predominant over ductile fracturing by the dimple ruptures originating from the fine granular precipitates in the matrix.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"15 1","pages":"21-29"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90264945","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

The Effect of Pd addition on Mechanical Properties at High Temperature of Mg-4Al-2Sn Alloy 添加Pd对Mg-4Al-2Sn合金高温力学性能的影响

Journal of Korea Foundry Society Pub Date : 2017-01-01 DOI: 10.7777/JKFS.2017.37.4.101

S. Yim, B. Kang, D. Cho, I. Park

引用次数: 0

Change of Secondary Dendrite Arm Spacing of Hypoeutectic Al-Si Alloys according to Si Content and Cooling Rate 亚共晶Al-Si合金二次枝晶臂间距随Si含量和冷却速率的变化

Journal of Korea Foundry Society Pub Date : 2017-01-01 DOI: 10.7777/jkfs.2017.37.4.108

Parkkyeongseob, Kim Hee-soo

引用次数: 0

Microstructure and Properties of High Strength High Ductility Al-Mg-Zn Casting Alloy 高强度高延展性铝镁锌铸造合金的组织与性能

Journal of Korea Foundry Society Pub Date : 2016-12-09 DOI: 10.7777/JKFS.2016.36.6.181

Jeong-Min Kim, Tae-Hyung Ha

引用次数: 0

A Study on the Effects of the Filter on Flow Pattern of the Traditional Gating System by the Water Modeling Experiment 通过水模拟实验研究过滤器对传统浇注系统流态的影响

Journal of Korea Foundry Society Pub Date : 2016-12-09 DOI: 10.7777/jkfs.2016.36.6.208

H. Hwang, C. Nam, Y. Choi, Jun-Ho Hong

{"title":"A Study on the Effects of the Filter on Flow Pattern of the Traditional Gating System by the Water Modeling Experiment","authors":"H. Hwang, C. Nam, Y. Choi, Jun-Ho Hong","doi":"10.7777/jkfs.2016.36.6.208","DOIUrl":"https://doi.org/10.7777/jkfs.2016.36.6.208","url":null,"abstract":"Casting defects, which are closely related to entrapped air bubbles and metallic oxides, occur very frequently in the casting process. Many researchers have shown that these defects can be reduced by adopting an appropriate gating system design. But, it is dif-ficult for field engineers to identify a specific gating system that is more appropriate for their products. In this study, we tried to draw a comparison of gating system designs with and without ceramic foam filters. A ceramic foam filter was added to the horizontal runner just after the sprue to prevent air bubble generation and to reduce turbulence without change of the gating system design. To verify the effects of initial pouring velocity, the experiment was conducted with four different amounts of water volume in the reservoir. Results of the water modeling experiment applying the filter showed remarkably changed flow characteristics. Although the study confirmed that use of the filter may change the flow characteristics, it needs to be noted that only filter use alone cannot solve all the problems caused by a poorly designed gating system.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"4 1","pages":"208-214"},"PeriodicalIF":0.0,"publicationDate":"2016-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87799556","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

Microstructures and Mechanical Properties of AM80-xSn Magnesium Alloys with Semi-Solid casting and Hot Extrusion Process 半固态铸造和热挤压AM80-xSn镁合金的组织和力学性能

Journal of Korea Foundry Society Pub Date : 2016-12-09 DOI: 10.7777/JKFS.2016.36.6.215

Dae-hwan Kim, In-Taek Im, Q. Jin, Su-gun Lim

引用次数: 0

Effects of Mg Addition on Heat Treatment and Mechanical Properties of A356 Alloy Mg对A356合金热处理及力学性能的影响

Journal of Korea Foundry Society Pub Date : 2016-12-09 DOI: 10.7777/JKFS.2016.36.6.195

Jae-Chan Jo, Kwang-Sam Kim, In-Taek Im, Dae-hwan Kim, Sung-Yong Shim, Su-gun Lim

引用次数: 0