Pub Date : 2015-06-30DOI: 10.7777/JKFS.2015.35.3.045
W. Jung, Daeho Jeong, Youngchai Lee, Jae‐Hyun Lee, Sangshik Kim
The effect of different C and Cr/Mo contents, which were varied within the range allowed in the relevant specification, on the mechanical and corrosion properties of A487 alloy cast steel were examined. The increase in strength level with increasing C content and the decrease in strength along with the increase in tensile elongation with decreasing Cr/Mo contents were observed in A487 alloys with different C and Cr/Mo contents. At room temperature, the decrease in Cr/Mo content was beneficial in improving the impact properties of A487 alloy, with no notable difference in absorbed energy with varying C content. The impact properties of A487 alloy at , on the other hand, greatly improved with the increase in C and the decrease in Cr/Mo contents. The corrosion behavior of A487 alloys in 3.5% NaCl solution did not show any meaningful change with different C and Cr/Mo contents.
{"title":"Mechanical and Corrosion Properties of A487 Cast with Different C and Cr/Mo Contents","authors":"W. Jung, Daeho Jeong, Youngchai Lee, Jae‐Hyun Lee, Sangshik Kim","doi":"10.7777/JKFS.2015.35.3.045","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.3.045","url":null,"abstract":"The effect of different C and Cr/Mo contents, which were varied within the range allowed in the relevant specification, on the mechanical and corrosion properties of A487 alloy cast steel were examined. The increase in strength level with increasing C content and the decrease in strength along with the increase in tensile elongation with decreasing Cr/Mo contents were observed in A487 alloys with different C and Cr/Mo contents. At room temperature, the decrease in Cr/Mo content was beneficial in improving the impact properties of A487 alloy, with no notable difference in absorbed energy with varying C content. The impact properties of A487 alloy at , on the other hand, greatly improved with the increase in C and the decrease in Cr/Mo contents. The corrosion behavior of A487 alloys in 3.5% NaCl solution did not show any meaningful change with different C and Cr/Mo contents.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"32 1","pages":"45-52"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82893503","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 : 2015-06-30DOI: 10.7777/JKFS.2015.35.3.062
K. Youn
Tape casting is an important forming operation used to prepare flat sheets in the various industries. In this study, Doctor Blade tape casting of In-based low melting point alloy was carried out. The purpose of this investigation was to determine the possibility of applying the Doctor Blade tape casting process to the manufacture of low melting point alloy sheets that can be used as thermal fusible parts of battery safety systems. In-based molten alloy that has a melting point of was produced; it`s viscosity was measured at various temperatures. The molten alloy was used as a slip in the caster of the Doctor Blade tape casting system. The effects of the molten alloy temperatures and carrier speeds on the produced sheet shape were observed. For the casting conditions of 1.5 cm slip height, slip temperature, 0.05 mm blade gap and 60 m/min. carrier speed, an In-based alloy thin tape well shaped with 0.16 mm uniform thickness was continuously produced.
{"title":"Doctor Blade Tape Casting of In-based Low Melting Point Alloy","authors":"K. Youn","doi":"10.7777/JKFS.2015.35.3.062","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.3.062","url":null,"abstract":"Tape casting is an important forming operation used to prepare flat sheets in the various industries. In this study, Doctor Blade tape casting of In-based low melting point alloy was carried out. The purpose of this investigation was to determine the possibility of applying the Doctor Blade tape casting process to the manufacture of low melting point alloy sheets that can be used as thermal fusible parts of battery safety systems. In-based molten alloy that has a melting point of was produced; it`s viscosity was measured at various temperatures. The molten alloy was used as a slip in the caster of the Doctor Blade tape casting system. The effects of the molten alloy temperatures and carrier speeds on the produced sheet shape were observed. For the casting conditions of 1.5 cm slip height, slip temperature, 0.05 mm blade gap and 60 m/min. carrier speed, an In-based alloy thin tape well shaped with 0.16 mm uniform thickness was continuously produced.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"62 1","pages":"62-66"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76294891","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 : 2015-04-30DOI: 10.7777/JKFS.2015.35.2.036
B. Kim, J. Seo, K. Park
In this study, the influences of aluminum and tin additions (individual and combined) on corrosion behavior of magnesium alloy have been determined. The studied alloys were fabricated by permanent mold casting method to measure the corrosion properties, a potentiodynamic test, hydrogen evolution test and immersion test were carried out in a 3.5% NaCl solution at pH 7.2. From the results of microstructure analysis, the Mg-9Al-1Zn alloy was found to be composed of α-Mg and rod-like Mg17Al12 phase and the Mg-5Sn-5Al-1Zn alloy was found to be composed of α-Mg, rod-like Mg17Al12 and Mg2Sn phases. In the case of the Mg-9Sn-1Zn alloy, the microstructure was composed of α-Mg and eutectic Mg2Sn phase. With Sn addition (individual and combined), the corrosion resistance of the Mg alloys improved.
{"title":"The Effect of Al and Sn Additions on Corrosion Behavior of Permanent Mold Casting Magnesium Alloy","authors":"B. Kim, J. Seo, K. Park","doi":"10.7777/JKFS.2015.35.2.036","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.2.036","url":null,"abstract":"In this study, the influences of aluminum and tin additions (individual and combined) on corrosion behavior of magnesium alloy have been determined. The studied alloys were fabricated by permanent mold casting method to measure the corrosion properties, a potentiodynamic test, hydrogen evolution test and immersion test were carried out in a 3.5% NaCl solution at pH 7.2. From the results of microstructure analysis, the Mg-9Al-1Zn alloy was found to be composed of α-Mg and rod-like Mg17Al12 phase and the Mg-5Sn-5Al-1Zn alloy was found to be composed of α-Mg, rod-like Mg17Al12 and Mg2Sn phases. In the case of the Mg-9Sn-1Zn alloy, the microstructure was composed of α-Mg and eutectic Mg2Sn phase. With Sn addition (individual and combined), the corrosion resistance of the Mg alloys improved.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"105 1","pages":"36-43"},"PeriodicalIF":0.0,"publicationDate":"2015-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86262076","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 : 2015-04-30DOI: 10.7777/JKFS.2015.35.2.023
E. Jang, K. Kim, S. Kim
This work presents the effect of the cooling rate on the precipitation of super duplex stainless steel. Specimens of super duplex stainless steel with a specific composition were cooled at various cooling rates after being melted at in a directional solidification furnace. Ferrite (), Austenite (), Sigma (), and Chi () phases were precipitated when the cooling rate was lower than 0.22 K/s. When the cooling rate was 0.22 K/s or faster, and phases were not precipitated.
{"title":"Influence of the Cooling Rate on the Phase Precipitation of Super Duplex Stainless Steel","authors":"E. Jang, K. Kim, S. Kim","doi":"10.7777/JKFS.2015.35.2.023","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.2.023","url":null,"abstract":"This work presents the effect of the cooling rate on the precipitation of super duplex stainless steel. Specimens of super duplex stainless steel with a specific composition were cooled at various cooling rates after being melted at in a directional solidification furnace. Ferrite (), Austenite (), Sigma (), and Chi () phases were precipitated when the cooling rate was lower than 0.22 K/s. When the cooling rate was 0.22 K/s or faster, and phases were not precipitated.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"74 1","pages":"23-28"},"PeriodicalIF":0.0,"publicationDate":"2015-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78007919","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 : 2015-04-30DOI: 10.7777/JKFS.2015.35.2.029
Kyeong-Seob Park, S. Kang, Hee-Soo Kim
In this study, potential defects of ring-type cast products during the mold-filling stage of the casting process were investigated using computer simulation. The main focus was on the effects of runner extension and ingates. During the mold filling the molten metal flowed from the bottom to the top of the mold in two curved paths along the ring-type cavity. The fluid fronts in the two paths did not show the identical velocity during the mold filling stage. This difference in the filling speeds may cause defects such as voids and local contractions. The present model contained virtual fluid detectors at various positions inside the mold. When the molten metal passed those points, the volume of fluid jumped up from zero to one. The moments were measured to compare the speeds of the fluid fronts. We attempted various combinations of runner extensions and ingates to stabilize the flow and then to optimize the casting mold design.
{"title":"Effects of Runner Extension and Ingates on Mold Filling in Ring-type Cast Products","authors":"Kyeong-Seob Park, S. Kang, Hee-Soo Kim","doi":"10.7777/JKFS.2015.35.2.029","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.2.029","url":null,"abstract":"In this study, potential defects of ring-type cast products during the mold-filling stage of the casting process were investigated using computer simulation. The main focus was on the effects of runner extension and ingates. During the mold filling the molten metal flowed from the bottom to the top of the mold in two curved paths along the ring-type cavity. The fluid fronts in the two paths did not show the identical velocity during the mold filling stage. This difference in the filling speeds may cause defects such as voids and local contractions. The present model contained virtual fluid detectors at various positions inside the mold. When the molten metal passed those points, the volume of fluid jumped up from zero to one. The moments were measured to compare the speeds of the fluid fronts. We attempted various combinations of runner extensions and ingates to stabilize the flow and then to optimize the casting mold design.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"75 1","pages":"29-35"},"PeriodicalIF":0.0,"publicationDate":"2015-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78778353","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 : 2015-02-28DOI: 10.7777/JKFS.2015.35.1.001
Jong-Gyu Ha, Sang-Yun Shin, Do-Hoon Lee, B. Ye
In this study, we investigated the effect of carbon on mechanical properties with different austempering conditions of high car-bon(0.7~1.3wt.%C)-2.0wt.%Si steels. The specimens were austenitized at 850, 925 and 1020 o C, and austempered at 260, 320 and 380 o C for the various period of time from 3 min to 300 min. After heat treatment, the evolution of stage I and stage II was iden-tified with optical microscope, XRD and hardness test. When the austempering temperature was 260 o C, the microstructure consisted of the lower ausferrite while the upper ausferrite micro-structure was formed at 380 o C. As the austempering temperature increases from 260 to 380 o C, the tensile strength decreases and elongation increases. In addition, when carbon content increases, tensile strength and elongation decrease.
{"title":"Mechanical Properties of Austempered Fe-2.0wt.%Si-0.3wt.%Mn Steel with various Carbon Contents","authors":"Jong-Gyu Ha, Sang-Yun Shin, Do-Hoon Lee, B. Ye","doi":"10.7777/JKFS.2015.35.1.001","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.1.001","url":null,"abstract":"In this study, we investigated the effect of carbon on mechanical properties with different austempering conditions of high car-bon(0.7~1.3wt.%C)-2.0wt.%Si steels. The specimens were austenitized at 850, 925 and 1020 o C, and austempered at 260, 320 and 380 o C for the various period of time from 3 min to 300 min. After heat treatment, the evolution of stage I and stage II was iden-tified with optical microscope, XRD and hardness test. When the austempering temperature was 260 o C, the microstructure consisted of the lower ausferrite while the upper ausferrite micro-structure was formed at 380 o C. As the austempering temperature increases from 260 to 380 o C, the tensile strength decreases and elongation increases. In addition, when carbon content increases, tensile strength and elongation decrease.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"56 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2015-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75118476","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 : 2015-02-28DOI: 10.7777/JKFS.2015.35.1.008
D. Jeong, Y. Moon, B. Moon, W. Park, K. Sohn
Variations of nickel contents and microstructures in molten magnesium alloys on the addition of aluminum, zirconium, and manganese have been investigated. Specimens were prepared by melting under and atmosphere and casting into a disc of 29 mm diameter with 7~10 mm thickness from the melt acquired at the top of crucible. Before casting, the molten metal was stirred for 3 minutes after each addition of alloying elements and maintained for 30 minutes for settling down. Results showed that zirconium did not significantly affect the content of nickel while aluminum remarkably reduced it by forming phase. When manganese are added to Mg-1wt%Ni alloy along with aluminum, both elements remarkably reduced the content of nickel. The addition of 1.5 wt% manganese to Mg-1wt%Ni alloy containing aluminum further reduced the content of nickel by more than 30%, during which an additional intermetallic phase was precipitated in the molten magnesium.
{"title":"Effect of Aluminum, Manganese, and Zirconium on the Content of Nickel in Molten Magnesium","authors":"D. Jeong, Y. Moon, B. Moon, W. Park, K. Sohn","doi":"10.7777/JKFS.2015.35.1.008","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.1.008","url":null,"abstract":"Variations of nickel contents and microstructures in molten magnesium alloys on the addition of aluminum, zirconium, and manganese have been investigated. Specimens were prepared by melting under and atmosphere and casting into a disc of 29 mm diameter with 7~10 mm thickness from the melt acquired at the top of crucible. Before casting, the molten metal was stirred for 3 minutes after each addition of alloying elements and maintained for 30 minutes for settling down. Results showed that zirconium did not significantly affect the content of nickel while aluminum remarkably reduced it by forming phase. When manganese are added to Mg-1wt%Ni alloy along with aluminum, both elements remarkably reduced the content of nickel. The addition of 1.5 wt% manganese to Mg-1wt%Ni alloy containing aluminum further reduced the content of nickel by more than 30%, during which an additional intermetallic phase was precipitated in the molten magnesium.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"40 1","pages":"8-14"},"PeriodicalIF":0.0,"publicationDate":"2015-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73605057","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 : 2014-12-31DOI: 10.7777/JKFS.2014.34.6.194
S. Ha, Y. Yoon, S. Kim
The effect of Al 2 Ca on the oxidation resistance and tensile property of Al-5Mg alloys was investigated. According to the TGA (Thermogravimetric analysis) result at 550 o C after 24hrs, the Al-5Mg alloy showed parabolic behavior with weight gain. On the other hand, there was almost no difference in the weight changes of the Al 2 Ca added Al-5Mg alloys during the oxidation. It was thought that the improvement of oxidation resistance in Al 2 Ca added Al-5Mg alloys might be due to the formation of a protective oxide layer with CaO and MgO on the surface. The microstructures of the alloys showed grain refinement with an increasing Al 2 Ca content. From the tensile test, the yield strength of the alloys were improved with an increasing Al 2 Ca content. The 0.07 mass%Al 2 Ca added Al-5Mg alloy showed similar elongation and increased strength, simultaneously. It was considered that the addi-tion of Al 2 Ca, which was superior in the oxidation resistance of Al, reduced the formation of Mg oxides and inclusions during the alloying. This, partly led to the improvement of tensile properties.
{"title":"Effect of Al 2 Ca on Oxidation Resistance and Tensile Property of Al-5Mg Alloy","authors":"S. Ha, Y. Yoon, S. Kim","doi":"10.7777/JKFS.2014.34.6.194","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.6.194","url":null,"abstract":"The effect of Al 2 Ca on the oxidation resistance and tensile property of Al-5Mg alloys was investigated. According to the TGA (Thermogravimetric analysis) result at 550 o C after 24hrs, the Al-5Mg alloy showed parabolic behavior with weight gain. On the other hand, there was almost no difference in the weight changes of the Al 2 Ca added Al-5Mg alloys during the oxidation. It was thought that the improvement of oxidation resistance in Al 2 Ca added Al-5Mg alloys might be due to the formation of a protective oxide layer with CaO and MgO on the surface. The microstructures of the alloys showed grain refinement with an increasing Al 2 Ca content. From the tensile test, the yield strength of the alloys were improved with an increasing Al 2 Ca content. The 0.07 mass%Al 2 Ca added Al-5Mg alloy showed similar elongation and increased strength, simultaneously. It was considered that the addi-tion of Al 2 Ca, which was superior in the oxidation resistance of Al, reduced the formation of Mg oxides and inclusions during the alloying. This, partly led to the improvement of tensile properties.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"2 1","pages":"194-199"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80252354","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 : 2014-12-31DOI: 10.7777/JKFS.2014.34.6.187
K. Park, B. Kim, J. Jung, D. Cho, I. Park
In the present work, the effect of adding Ce on the corrosion behavior of Mg-4Al-2Sn-1Ca alloy was investigated. The studied alloys were fabricated by gravity casting method and a potentiodynamic polarization, A.C. impedance and hydrogen evolution tests were carried out in a 3.5% NaCl solution with pH 7.2 at room temperature to measure the corrosion properties of Mg-4Al-2Sn-1CaxCe alloys. The microstructure of the Mg-4Al-2Sn-1Ca alloy was composed of α-Mg, Mg17Al12, Mg2Sn and CaMgSn phase. Also, a Al11Ce3 phase was newly formed by the addition of Ce. With an increase of the Ce contents, the microstructure became refined and the corrosion resistance improved.
{"title":"The Effect of Ce Addition on Corrosion Behavior of Permanent Mold Casting Mg-4Al-2Sn-1Ca alloy","authors":"K. Park, B. Kim, J. Jung, D. Cho, I. Park","doi":"10.7777/JKFS.2014.34.6.187","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.6.187","url":null,"abstract":"In the present work, the effect of adding Ce on the corrosion behavior of Mg-4Al-2Sn-1Ca alloy was investigated. The studied alloys were fabricated by gravity casting method and a potentiodynamic polarization, A.C. impedance and hydrogen evolution tests were carried out in a 3.5% NaCl solution with pH 7.2 at room temperature to measure the corrosion properties of Mg-4Al-2Sn-1CaxCe alloys. The microstructure of the Mg-4Al-2Sn-1Ca alloy was composed of α-Mg, Mg17Al12, Mg2Sn and CaMgSn phase. Also, a Al11Ce3 phase was newly formed by the addition of Ce. With an increase of the Ce contents, the microstructure became refined and the corrosion resistance improved.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"13 1","pages":"187-193"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87533189","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 : 2014-12-31DOI: 10.7777/JKFS.2014.34.6.200
Hyun Sik Kim, D. Ye, M. Kang, Jung Dae Kim, Hae-Yong Jeong
Pure magnesium and magnesium alloys have been applied to various kinds of industrial fields, especially automotive and electronic parts. These parts are manufactured mainly through a diecasting process. These days, magnesium ingots are used as raw material, and recycled ingots are often used for commercial purposes. But the quality of virgin magnesium and recycled ingots is not secure. Therefore, massive casting defects can occur, and some things manufactured can be damaged by these defects. This study evaluated the inclusions of virgin magnesium and recycled ingot. It also included composition analysis by spectrometer, measuring inclusion contents by SEM & EDS, and performing a brightness test on fractured surfaces. The brightness test is generally very easy and obtains results quickly, so its results have been compared with the results obtained from various test methods. From the test results, we obtained a satisfactory result in evaluating inclusion and oxide. The brightness values are lower as the inclusion contents are higher. When the brightness value is over 47 in AM50A and 44 in AZ91D, the mechanical properties are expected to be good.
{"title":"The Brightness Change of Fractured Surface in Accordance with Inclusion Contents of Magnesium Alloy","authors":"Hyun Sik Kim, D. Ye, M. Kang, Jung Dae Kim, Hae-Yong Jeong","doi":"10.7777/JKFS.2014.34.6.200","DOIUrl":"https://doi.org/10.7777/JKFS.2014.34.6.200","url":null,"abstract":"Pure magnesium and magnesium alloys have been applied to various kinds of industrial fields, especially automotive and electronic parts. These parts are manufactured mainly through a diecasting process. These days, magnesium ingots are used as raw material, and recycled ingots are often used for commercial purposes. But the quality of virgin magnesium and recycled ingots is not secure. Therefore, massive casting defects can occur, and some things manufactured can be damaged by these defects. This study evaluated the inclusions of virgin magnesium and recycled ingot. It also included composition analysis by spectrometer, measuring inclusion contents by SEM & EDS, and performing a brightness test on fractured surfaces. The brightness test is generally very easy and obtains results quickly, so its results have been compared with the results obtained from various test methods. From the test results, we obtained a satisfactory result in evaluating inclusion and oxide. The brightness values are lower as the inclusion contents are higher. When the brightness value is over 47 in AM50A and 44 in AZ91D, the mechanical properties are expected to be good.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"94 1","pages":"200-213"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76794668","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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