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Journal of Korea Foundry Society最新文献

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The Effect of Remelting Cycles and Its Carbon Content on the Glass Forming Ability and Mechanical Properties of the Zr-based Amorphous Alloy Return Scrap 重熔循环次数及含碳量对zr基非晶合金回料玻璃化成形能力及力学性能的影响
Journal of Korea Foundry Society Pub Date : 2014-06-30 DOI: 10.7777/JKFS.2014.34.3.094
Byung-chul Lee, Sung-Gyoo Kim, B. Park, Heung-Il Park, H. Park
{"title":"The Effect of Remelting Cycles and Its Carbon Content on the Glass Forming Ability and Mechanical Properties of the Zr-based Amorphous Alloy Return Scrap","authors":"Byung-chul Lee, Sung-Gyoo Kim, B. Park, Heung-Il Park, H. Park","doi":"10.7777/JKFS.2014.34.3.094","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.3.094","url":null,"abstract":"A commercially used Zr-based amorphous alloy was recycled and the effects of introducing carbon during recycling on the glass forming ability and mechanical properties of the alloy were investigated. The initial carbon content used in this study was 229ppm. The carbon content was gradually increased as the number of recycling iterations was increased and after the 4 recycling it rapidly increased. As return scrap was recycled, polygonal particles precipitated, and they were identified as ZrC. The amount of the precipitates also increased with recycling. Tg, Tx and ∆T of the base alloy were 615 K, 696 K and 81 Kr respectively and they changed to 634 K, 706 K and 72 K after the 10 recycling. The decrease of the ∆T value indicates deterioration of the glass forming ability. Hardness was not changed during three iterations of recycling but after the 4 recycling it significantly increased. This is ascribed to an increase of amount of the hard particles, namely ZrC.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"47 1","pages":"94-99"},"PeriodicalIF":0.0,"publicationDate":"2014-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85702867","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
A Study on Mechanical Characteristic of Hydrogen Charged Al-6.3Zn-2.4Mg Alloy 充氢Al-6.3Zn-2.4Mg合金力学特性研究
Journal of Korea Foundry Society Pub Date : 2014-04-30 DOI: 10.7777/JKFS.2014.34.2.054
Dae-hwan Kim, Tae-young Choi, Sung-Young Shim, Su-gun Lim
{"title":"A Study on Mechanical Characteristic of Hydrogen Charged Al-6.3Zn-2.4Mg Alloy","authors":"Dae-hwan Kim, Tae-young Choi, Sung-Young Shim, Su-gun Lim","doi":"10.7777/JKFS.2014.34.2.054","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.2.054","url":null,"abstract":"In this study, the extruded Al-6.3Zn-2.4Mg alloys were selected among the 7000 series aluminum alloys sensitive to hydrogen environment in order to examine the effects of both the aging conditions and the length of hydrogen charging period on the mechanical properties of the alloy. The specimens were aged for 24hours at (under aging (UA)), (peak aging (PA)), and (over aging (OA)), respectively. Charging tests were performed at RT for 12, 24, 36 hours under potentiostatic conditions (-2000 mV vs (Ag/AgCl)) for 12, 24 and 36 hours in 1M and 0.1% solution. The fracture surface was examined by scanning electron microscopy (SEM). X-ray diffraction (XRD) pattern in peak aged sample was obtained before and after hydrogen charging from extruded Al-6.3Zn-2.4Mg alloys. The decreasing rate of tensile strength and elongation is represented in order of over aging in hydrogen charged Al-6.3Zn-2.4Mg alloys has been confirmed by X-ray diffraction studies.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"49 1","pages":"54-59"},"PeriodicalIF":0.0,"publicationDate":"2014-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83560804","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 Blasting Treatment on the Corrosion Characteristics in the Zr-based Amorphous Alloy Die Castings 爆破处理对zr基非晶合金压铸件腐蚀特性的影响
Journal of Korea Foundry Society Pub Date : 2014-04-30 DOI: 10.7777/JKFS.2014.34.2.060
Byung-chul Lee, Sung-Gyoo Kim, B. Park, Cha-Hurn Bae, Heung-Il Park
{"title":"The Effect of Blasting Treatment on the Corrosion Characteristics in the Zr-based Amorphous Alloy Die Castings","authors":"Byung-chul Lee, Sung-Gyoo Kim, B. Park, Cha-Hurn Bae, Heung-Il Park","doi":"10.7777/JKFS.2014.34.2.060","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.2.060","url":null,"abstract":"A Zr-based amorphous alloy specimen was produced by vacuum die casting process. The salt spray test was carried out using the specimens in the as-cast, and particle blasted state. Using these specimens, the SEM-EDX and XRD analyses, DSC measurement and bending strength test were conducted. After the salt spray test, the specimens were not experienced phase change and thermal characteristics of the alloys were remained unchanged. In the as-cast specimen, corrosion products were not observed. However, in the particle blasted specimen, pitting corrosion occurred and the detected corrosion products were and . Due to the salt spray test, bending strength of the blasted specimens showed about 100 MPa lower strength than the other specimens. The bending fracture surface was vein pattern which was shown typically in the amorphous alloys.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"182 1","pages":"60-66"},"PeriodicalIF":0.0,"publicationDate":"2014-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85562738","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 Sn on the Glass Formation Ability of the Zr-based Amorphous Alloy Sn对zr基非晶合金玻璃化能力的影响
Journal of Korea Foundry Society Pub Date : 2014-04-30 DOI: 10.7777/JKFS.2014.34.2.049
Byung-chul Lee, Heong Park, B. Park, Sung-Gyoo Kim
{"title":"The Effect of Sn on the Glass Formation Ability of the Zr-based Amorphous Alloy","authors":"Byung-chul Lee, Heong Park, B. Park, Sung-Gyoo Kim","doi":"10.7777/JKFS.2014.34.2.049","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.2.049","url":null,"abstract":"In commercial Zr-Nb-Cu-Ni-Al amorphous alloys, expensive element, Zr, was substituted to Sn which was cheaper one, and then, glass forming ability, compressive strength and hardness of them were estimated. Even though the Sn was added up to 1.5%, resulting phase was not changed to the crystalline form. It was confirmed by X-ray diffraction and thermal analyses. In the X-ray profiles, there were no peaks for crystalline phases and typical halo pattern for amorphous phase was appeared at the diffraction angle of 35o~45o. Thermal analyses also showed that the Sn modified alloys were corresponded to the amorphous standards where ∆T(= Tx − Tg) and Trg(= Tg/Tm) affecting to the amorphous forming ability were more than 50K and 0.60 respectively. Compressive strengths were 1.77 GPa, 1.63 GPa, 1.65 GPa and 1.77 GPa for 0%Sn, 0.5%Sn, 1.0%Sn and 1.5%Sn respectively. Hardnesses of the Sn modified alloys were decreased from 752 Hv to 702 Hv in 1.0%Sn and recovered to 746 Hv in 1.5%Sn.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"24 1","pages":"49-53"},"PeriodicalIF":0.0,"publicationDate":"2014-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90266098","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
Effect of Shrinkage Defect on Fracture Impact Energy of A356 Cast Aluminum Alloy 收缩缺陷对A356铸造铝合金断裂冲击能的影响
Journal of Korea Foundry Society Pub Date : 2014-02-28 DOI: 10.7777/JKFS.2014.34.1.022
Hwang-Seong Chul, S. Kwak
{"title":"Effect of Shrinkage Defect on Fracture Impact Energy of A356 Cast Aluminum Alloy","authors":"Hwang-Seong Chul, S. Kwak","doi":"10.7777/JKFS.2014.34.1.022","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.1.022","url":null,"abstract":"Internal defects, such as shrinkage during casting, cause stress concentrations and initiate cracking. Therefore, it is important to understand the effects of internal defects on the mechanical properties including the impact behavior. This study evaluates the effects of internal casting defects on the impact performance of A356 Al-alloy castings. The internal shrinkage defects in the casting impact specimen are scanned using an industrial Computed Tomography (CT) scanner, and drop impact tests are performed with varing impact velocities on the A356 casting aluminium specimen (10 mm × 10 mm section area) in order to locate the fracture energy under an impact load. The specimens with defects with a diameter less than 0.35 mm exhibit equivalent fracture impact energies of approximately 32 J and those with a 1.7 mm diameter defect reduced the fracture impact energy by 35%.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"1 1","pages":"22-26"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84214366","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
Mechanical Properties of Low-Pressure Die Cast A356-T6 alloys for Automotive Wheels 汽车车轮用低压压铸A356-T6合金的力学性能
Journal of Korea Foundry Society Pub Date : 2014-02-28 DOI: 10.7777/JKFS.2014.34.1.006
B. Yoo, Jeong-Ho Kim, H. Yoon, S. Ur
{"title":"Mechanical Properties of Low-Pressure Die Cast A356-T6 alloys for Automotive Wheels","authors":"B. Yoo, Jeong-Ho Kim, H. Yoon, S. Ur","doi":"10.7777/JKFS.2014.34.1.006","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.1.006","url":null,"abstract":"Abstract The mechanical properties of low-pressure die cast (LPDC) A356-T6 automotive road wheels are evaluated and correlated withtheir corresponding microstructures. In this study, two types of alloy wheels processed using different LPDC gating system areinvestigated. The yield stress, tensile stress, and elongation values tested at room temperature are correlated with the secondary den-drite arm spacing (SDAS) with respect to the gating system, and are also compared with similar studies. The SDAS and precipitatesare examined using optical microscopy, scanning electron microscopy (SEM) and energy-dispersive spectroscopy. The phase infor-mation is also investigated using X-ray diffraction. Charpy impact tests are also performed from −100 o C to 200 o C, and the fracturesurfaces are examined using SEM. The impact energy is demonstrated to increase with increasing temperatures without exhibitingspecific transition behaviors as in other nonferrous alloys. The fracture toughness is also evaluated using three point bend test withsingle-edged bend specimens. The obtained fracture toughness values are in good agreement with those in similar studies.Key words: Mechanical property, SDAS, Impact test, Fracture toughness, A356-T6 alloy","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"46 1","pages":"6-13"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91255930","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 Austempering Transformation Behavior of Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn Steel Fe-0.7wt.%C-2.3wt.%Si-0.3wt的等温回火相变行为。% Mn钢
Journal of Korea Foundry Society Pub Date : 2014-02-28 DOI: 10.7777/JKFS.2014.34.1.001
Sang-Yun Shin, Do-Hoon Lee, Seo-Eun Kim, B. Ye
{"title":"The Austempering Transformation Behavior of Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn Steel","authors":"Sang-Yun Shin, Do-Hoon Lee, Seo-Eun Kim, B. Ye","doi":"10.7777/JKFS.2014.34.1.001","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.1.001","url":null,"abstract":"The austempering transformation behavior in Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn steel is investigated. Each specimen was aus-tenitized for 60 min at 900 o C, and austempered at 380 o C for different time periods varying from 2 min to 256 min. After the austempering heat treatment, the Stage I and II evolutions are performed using optical metallography, X-ray diffraction and image analyses. Variations in the X-ray diffraction patterns and lattice parameters of the ferrite and austenite demonstrate that the residual austenite decomposes into ferrite and carbide during the Stage II evolution; moreover the amount of ferrite increases during the Stage I evolution. While the amount of austenite increases during Stage I, it dicreases during Stage II. Overall, the variations in the volume fractions of the microstructure and carbide formation in stages I and II meet high temperature austempering reaction of the ausferrite microstructure.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"11 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82476244","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
The Quantitative Evaluation for Impurities of Magnesium Diecasting Alloys 镁压铸合金杂质的定量评价
Journal of Korea Foundry Society Pub Date : 2014-02-28 DOI: 10.7777/JKFS.2014.34.1.014
Hyun Sik Kim, D. Ye, M. Kang, K. Sohn, Hae-Yong Jeong
{"title":"The Quantitative Evaluation for Impurities of Magnesium Diecasting Alloys","authors":"Hyun Sik Kim, D. Ye, M. Kang, K. Sohn, Hae-Yong Jeong","doi":"10.7777/JKFS.2014.34.1.014","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.1.014","url":null,"abstract":"Magnesium and its alloys are being applied to various kinds of industrial fields, especially their use on automotive parts and electronic part. These parts are manufactured mainly through diecasting process and magnesium ingots are used as raw materials. In the case that ingot quality is not secured, massive casting defects can occur and some manufactures can be damaged by the defects. This study is to evaluate ingots` cleanliness of magnesium alloys. It includes composition analysis by spectrometer, measurement of inclusion contents by SEM, brightness test on fractured surface and etc. Especially, the brightness test is a very easy and quick evaluation method. The brightness becomes low when the amount of oxides or inclusions on the surface increases. The brightness test data have been compared with those obtained from other methods for measuring the mount of impurities, which showed good relationship between the brightness and the others. Thus, the brightness test could be a promising method to measure the cleanliness of magnesium alloys.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"41 1","pages":"14-21"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91021801","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
Effect of Fe, Mn Content on the Castability in Al-9wt%Si-Mg System Alloys for High Elongation Fe、Mn含量对Al-9wt%Si-Mg系高延伸合金浇注性能的影响
Journal of Korea Foundry Society Pub Date : 2013-12-31 DOI: 10.7777/JKFS.2013.33.6.233
Heon-Joo Kim, C. Jeong
{"title":"Effect of Fe, Mn Content on the Castability in Al-9wt%Si-Mg System Alloys for High Elongation","authors":"Heon-Joo Kim, C. Jeong","doi":"10.7777/JKFS.2013.33.6.233","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.6.233","url":null,"abstract":"Effect of Fe and Mn contents on the castability of Al-9wt%Si-xMg-yFe-zMn alloy has been studied. The alloy was composed of α-Al phase, Al+eutectic Si phase, β-Al5FeSi compound and chinese script α-Al15(Mn,Fe)3Si2 compound. β-Al5FeSi and αAl15(Mn,Fe)3Si2 compounds assumed to effect the fluidity and shrinkage behaviors of the alloy during solidification due to the crystallization of α-Al15(Fe,Mn)3Si2 and β-Al5FeSi compounds above eutectic temperature. As Fe and Mn contents of Al-9wt%Si0.3wt%Mg system alloy increased from 0.15wt% to 0.6wt% and from 0.3wt% to 0.7wt%, fluidity of the alloy decreased by 5.7% and 3.3%, respectively. And as Mg content of Al-9wt%Si-0.45wt%Fe-0.5wt%Mn system alloy increased from 0.3wt% to 0.4wt%, fluidity of the alloy decreased by 8.6%. When Fe content of the alloy increased from 0.15wt% to 0.6wt%, macro shrinkage ratio decreased from 6.1% to 4.1%, and micro shrinkage ratio increased from 0.04% to 0.24%. Similarly, Mn content of the alloy increased from 0.3wt% to 0.7wt%, macro shrinkage ratio decreased from 6.0% to 4.5% and micro shrinkage ratio increased from 0.12% to 0.18%. Judging from the castability of the alloy, Al-9wt%Si-0.3wt%Mg alloy with low content of Fe and Mn, 0.1wt% Fe and 0.3wt% Mn, is recommendable.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"1 1","pages":"233-241"},"PeriodicalIF":0.0,"publicationDate":"2013-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81237419","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
Properties and Casting Capabilities of Al-Fe-Zn-Cu Alloys for High Conductivity Parts 高导电性零件用Al-Fe-Zn-Cu合金的性能及铸造性能
Journal of Korea Foundry Society Pub Date : 2013-12-31 DOI: 10.7777/JKFS.2013.33.6.242
H. Yun, Jeong-Min Kim, Joonsik Park, K. Kim, Se-Hyun Ko
{"title":"Properties and Casting Capabilities of Al-Fe-Zn-Cu Alloys for High Conductivity Parts","authors":"H. Yun, Jeong-Min Kim, Joonsik Park, K. Kim, Se-Hyun Ko","doi":"10.7777/JKFS.2013.33.6.242","DOIUrl":"https://doi.org/10.7777/JKFS.2013.33.6.242","url":null,"abstract":"The most widely utilized commercial, aluminum-casting alloys are based on an aluminum-silicon system due to its excellent casting, and good mechanical, properties. Unfortunately, these Al-Si based alloys are inherently poor energy conductors; compared to pure aluminum, because of their high silicon content. This means that they are not suitable for applications demanding high eletrical or thermal conductivity. Therefore, efforts are currently being made to develop new, highly-conductive aluminum-casting alloys containing no silicon. In this research, a number of properties; including potential for castability, were investigated for a number of Al-Fe-Zn-Cu alloys with varying Cu content. As the copper content was increased, the tensile strength of Al-Fe-Zn-Cu alloy tended to increase gradually, while the electrical conductivity was slightly reduced. Fluidity was found to be lower in high-Cu alloys, and susceptibility to hot-cracking was generally high in all the alloys investigated.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"36 8 1","pages":"242-247"},"PeriodicalIF":0.0,"publicationDate":"2013-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78317118","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
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