Pub Date : 2016-04-30DOI: 10.7777/JKFS.2016.36.2.53
Sang-Hwa Lee, Jae-Gil Jung, Jung-Moo Lee, Young-Hee Cho, W. Yoon, Y. Ahn, Dong-Chun Yun, Jeong-Keun Lee, K. Ryu
The effects of ultrasonic melt treatment on the microstructures of aluminum piston were examined at five observation parts hav-ing different cooling rates. The microstructure of aluminum piston consisted of primary Si, eutectic Si, and various types of intermetallic compounds. Regardless of cooling rate, the ultrasonic melt treatment transformed dendritic eutectic cells to equiaxed eutectic cells and it decreased the sizes of eutectic Si and intermetallic compounds that exist at eutectic cell boundaries. In the absence of ultrasonic treatment, coarse primary Si particles were severely segregated and its size was increased with decreasing the cooling rate. The ultrasonic treatment decreased the size of primary Si particles from 25.5~31.0 µ m to 17.6~23.1 µ m, depending on the cooling rate. In the presence of ultrasonic treatment, relatively fine primary Si particles were homogeneously distributed throughout the piston. In addition, the ultrasonic treatment increased the population density and area fraction of fine primary Si particles.
{"title":"Refinement of Microstructures for Aluminum Piston through Ultrasonic Melt Treatment","authors":"Sang-Hwa Lee, Jae-Gil Jung, Jung-Moo Lee, Young-Hee Cho, W. Yoon, Y. Ahn, Dong-Chun Yun, Jeong-Keun Lee, K. Ryu","doi":"10.7777/JKFS.2016.36.2.53","DOIUrl":"https://doi.org/10.7777/JKFS.2016.36.2.53","url":null,"abstract":"The effects of ultrasonic melt treatment on the microstructures of aluminum piston were examined at five observation parts hav-ing different cooling rates. The microstructure of aluminum piston consisted of primary Si, eutectic Si, and various types of intermetallic compounds. Regardless of cooling rate, the ultrasonic melt treatment transformed dendritic eutectic cells to equiaxed eutectic cells and it decreased the sizes of eutectic Si and intermetallic compounds that exist at eutectic cell boundaries. In the absence of ultrasonic treatment, coarse primary Si particles were severely segregated and its size was increased with decreasing the cooling rate. The ultrasonic treatment decreased the size of primary Si particles from 25.5~31.0 µ m to 17.6~23.1 µ m, depending on the cooling rate. In the presence of ultrasonic treatment, relatively fine primary Si particles were homogeneously distributed throughout the piston. In addition, the ultrasonic treatment increased the population density and area fraction of fine primary Si particles.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"66 1","pages":"53-59"},"PeriodicalIF":0.0,"publicationDate":"2016-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76063922","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 : 2016-04-30DOI: 10.7777/JKFS.2016.36.2.67
Y. Kwon, Heon-Joo Kim
The effects of scrap content on the hot tearing property and tensile property were investigated in AC2BS alloy. The hot tearing strengths were 16.4 kgf/cm, 15.2 kgf/cm, 14.9 kgf/cm and 13.3 kgf/cm, respectively, under the constant solid fraction of 29.3% when the scrap contents of the specimens were 0%, 20%, 35% and 50%. In the same way, tensile strengths of the as-cast condition were 24.5 kgf/mm, 23.7 kgf/mm, 17.3 kgf/mm and 16.0 kgf/mm, respectively, and the corresponding tensile strengths of the T6 heat treatment condition were 27.2 kgf/mm, 26.7 kgf/mm, 24.2 kgf/mm and 23.9 kgf/mm. Hot tearing strength and tensile strength decreased as scrap content of the specimen increased. According to the evaluation of the quantitative hot tearing and tensile test results, the decrease of these strengths is due to the presence of oxide films which act as crack initiation site of the specimens. Therefore, elimination of oxide films of aluminum melt to maintain melt cleanliness is required.
{"title":"Effect of Scrap Content on the Hot Tearing Property and Tensile Property of AC2BS Alloy","authors":"Y. Kwon, Heon-Joo Kim","doi":"10.7777/JKFS.2016.36.2.67","DOIUrl":"https://doi.org/10.7777/JKFS.2016.36.2.67","url":null,"abstract":"The effects of scrap content on the hot tearing property and tensile property were investigated in AC2BS alloy. The hot tearing strengths were 16.4 kgf/cm, 15.2 kgf/cm, 14.9 kgf/cm and 13.3 kgf/cm, respectively, under the constant solid fraction of 29.3% when the scrap contents of the specimens were 0%, 20%, 35% and 50%. In the same way, tensile strengths of the as-cast condition were 24.5 kgf/mm, 23.7 kgf/mm, 17.3 kgf/mm and 16.0 kgf/mm, respectively, and the corresponding tensile strengths of the T6 heat treatment condition were 27.2 kgf/mm, 26.7 kgf/mm, 24.2 kgf/mm and 23.9 kgf/mm. Hot tearing strength and tensile strength decreased as scrap content of the specimen increased. According to the evaluation of the quantitative hot tearing and tensile test results, the decrease of these strengths is due to the presence of oxide films which act as crack initiation site of the specimens. Therefore, elimination of oxide films of aluminum melt to maintain melt cleanliness is required.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"198 1","pages":"67-74"},"PeriodicalIF":0.0,"publicationDate":"2016-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73752089","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 : 2016-02-29DOI: 10.7777/JKFS.2016.36.1.1
Young-Hee Cho, Jung-Moo Lee, Jin Jin, Jae-Gil Jung
Improvement of the mechanical properties of a commercial aluminium casting alloy, A356, was achieved through an optimised combination of alloying elements, modification, and heat treatment. 0.7 wt.% Cu and an additional 0.2 wt.% Mg were added to an Al-7Si-0.35Mg alloy for strengthening at both room and elevated temperatures, whilst a subsequent decrease in the ductility was compensated for by the modification of eutectic Si by Sr addition at a level of up to 110 ppm. It was found that the dissolution of Cu-rich or Mg-rich phases could be maximised by solid-solutionising an alloy with 40 ppm Sr at 530 o C, increasing the tensile and yield strengths to 350 MPa and 297 MPa, respectively, with a reasonably high strain of 5% after peak-aging at 210 o C. Further addition of Sr up to 110 ppm is, however, more likely to interfere with the dissolution of the Cu-rich or Mg-rich phases during solid solution treatment, resulting in a slight decrease in both tensile and yield strengths at room temperature. Besides the Cu addition, such undissolved phases, on the other hand, may contribute to elevated temperature strength
通过优化合金元素、改性和热处理的组合，提高了商用铝铸造合金A356的机械性能。在Al-7Si-0.35Mg合金中加入0.7 wt.%的Cu和额外的0.2 wt.%的Mg，用于室温和高温强化，同时通过添加高达110 ppm的Sr对共晶Si进行改性，弥补了随后塑性的下降。发现解散Cu-rich或Mg-rich阶段可以最大化solid-solutionising合金40 ppm Sr 530 o C,增加强度和产量优势350 MPa和297 MPa,分别合理高应变的5%在210度C . peak-aging后进一步增加Sr 110 ppm,然而,更有可能干扰Cu-rich的解体或Mg-rich阶段固溶体治疗期间,导致室温下拉伸强度和屈服强度的轻微下降。另一方面，除了Cu的加入外，这些未溶解相可能有助于提高温度强度
{"title":"Improvement of the Mechanical Properties of Al-7Si-0.35Mg Cast Alloys by the Optimised Combination of Alloying Elements and Heat Treatment","authors":"Young-Hee Cho, Jung-Moo Lee, Jin Jin, Jae-Gil Jung","doi":"10.7777/JKFS.2016.36.1.1","DOIUrl":"https://doi.org/10.7777/JKFS.2016.36.1.1","url":null,"abstract":"Improvement of the mechanical properties of a commercial aluminium casting alloy, A356, was achieved through an optimised combination of alloying elements, modification, and heat treatment. 0.7 wt.% Cu and an additional 0.2 wt.% Mg were added to an Al-7Si-0.35Mg alloy for strengthening at both room and elevated temperatures, whilst a subsequent decrease in the ductility was compensated for by the modification of eutectic Si by Sr addition at a level of up to 110 ppm. It was found that the dissolution of Cu-rich or Mg-rich phases could be maximised by solid-solutionising an alloy with 40 ppm Sr at 530 o C, increasing the tensile and yield strengths to 350 MPa and 297 MPa, respectively, with a reasonably high strain of 5% after peak-aging at 210 o C. Further addition of Sr up to 110 ppm is, however, more likely to interfere with the dissolution of the Cu-rich or Mg-rich phases during solid solution treatment, resulting in a slight decrease in both tensile and yield strengths at room temperature. Besides the Cu addition, such undissolved phases, on the other hand, may contribute to elevated temperature strength","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"1 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76232741","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 : 2016-02-29DOI: 10.7777/JKFS.2016.36.1.18
Jae-Won Moon, Ji-Sung Park, S. Yi
Iron based amorphous ribbons with the nominal compositions of (Fe 79 C 11 B 8 Si 2 ) 100-X Cr X (X = 0,2,4,6,8 at%) have been developed as reinforcements that can be applied to the concrete materials. Mechanical properties and glass forming ability of the ribbons can be enhanced by the optimum amounts of Cr additions that can also improve corrosion properties of the ribbons. Vein patterns typ-ical of the fractured surface morphology of amorphous alloys have been observed on the surfaces of ribbons after tensile tests. It is inferred from the EDS analysis results of vein patterns that carbon segregations occur within the narrow shear band regions.
铁基非晶带的标称成分为(Fe 79 C 11 B 8 Si 2) 100-X Cr X (X = 0,2,4,6,8 at%)，已被开发为可应用于混凝土材料的增强材料。添加适量的铬可以提高带的机械性能和玻璃化成形能力，同时还可以改善带的腐蚀性能。在拉伸试验后，在带状表面观察到典型的非晶合金断裂表面形貌的脉状图案。从脉型的EDS分析结果可以推断，碳偏析发生在窄剪切带区域内。
{"title":"Glass Forming Ability and Mechanical Properties of (Fe 79 C 11 B 8 Si 2 ) 100-X Cr X (X = 0-8) Amorphous Ribbons","authors":"Jae-Won Moon, Ji-Sung Park, S. Yi","doi":"10.7777/JKFS.2016.36.1.18","DOIUrl":"https://doi.org/10.7777/JKFS.2016.36.1.18","url":null,"abstract":"Iron based amorphous ribbons with the nominal compositions of (Fe 79 C 11 B 8 Si 2 ) 100-X Cr X (X = 0,2,4,6,8 at%) have been developed as reinforcements that can be applied to the concrete materials. Mechanical properties and glass forming ability of the ribbons can be enhanced by the optimum amounts of Cr additions that can also improve corrosion properties of the ribbons. Vein patterns typ-ical of the fractured surface morphology of amorphous alloys have been observed on the surfaces of ribbons after tensile tests. It is inferred from the EDS analysis results of vein patterns that carbon segregations occur within the narrow shear band regions.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"19 1","pages":"18-23"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74129944","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 : 2016-02-29DOI: 10.7777/JKFS.2016.36.1.24
Jae-Han Lim, Hyun-Do Jung, Ji-Ho Ahn, B. Moon
CD4MCU duplex stainless steel with gadolinium was fabricated as a neutron absorbing material by the air induction melting method. The gadolinium formed intermetallic compounds of Cu-Gd-Fe. There were no significant differences in hardness or ultimate tensile strength between experimental alloys. With the addition of gadolinium the yield strength of the cast alloy significantly increased, from 478.8 ± 11.6 to 514.2 ± 29.9 MPa, whereas elongation of the cast alloy decreased with the addition of gadolinium, from 26.0 ± 7.1 to 7.0 ± 2.5% due to the formation of gadolinium based intermetallic compounds.
{"title":"Microstructure and Fracture Property of 1A Grade Duplex Stainless Steel with the Addition of Gadolinium","authors":"Jae-Han Lim, Hyun-Do Jung, Ji-Ho Ahn, B. Moon","doi":"10.7777/JKFS.2016.36.1.24","DOIUrl":"https://doi.org/10.7777/JKFS.2016.36.1.24","url":null,"abstract":"CD4MCU duplex stainless steel with gadolinium was fabricated as a neutron absorbing material by the air induction melting method. The gadolinium formed intermetallic compounds of Cu-Gd-Fe. There were no significant differences in hardness or ultimate tensile strength between experimental alloys. With the addition of gadolinium the yield strength of the cast alloy significantly increased, from 478.8 ± 11.6 to 514.2 ± 29.9 MPa, whereas elongation of the cast alloy decreased with the addition of gadolinium, from 26.0 ± 7.1 to 7.0 ± 2.5% due to the formation of gadolinium based intermetallic compounds.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"101 1","pages":"24-31"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90642607","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 : 2016-02-29DOI: 10.7777/JKFS.2016.36.1.10
Sung-Mo Lee, D. Kim, T. Park, Y. Yoon
Numerical analysis has been performed to evaluate effect of the shape variables such as core length, slot width and slot length on misrun in aluminum die casting process for motor rotor. The predictive method for misrun in diecasting process was established by comparing the result of numerical analysis and an actual motor rotor. Solidification modulus was introduced to predict quantitatively the castability of aluminum diecasting process for motor rotor. It was found that there are minimum critical solidification modulus and slot width to prevent misrun according to core length through diecasting limit diagram proposed using the predictive method. The critical solidification modulus and slot width increase as core length increases to prevent misrun of aluminum motor rotor in diecasting process. Based on the results, the design criteria of slot shape to prevent misrun of aluminum motor rotor with various core length were established.
{"title":"Establishment of Design Criteria for Slot Shape Considering Castability of Aluminum Diecasting Process for Large Industrial Motor Rotor","authors":"Sung-Mo Lee, D. Kim, T. Park, Y. Yoon","doi":"10.7777/JKFS.2016.36.1.10","DOIUrl":"https://doi.org/10.7777/JKFS.2016.36.1.10","url":null,"abstract":"Numerical analysis has been performed to evaluate effect of the shape variables such as core length, slot width and slot length on misrun in aluminum die casting process for motor rotor. The predictive method for misrun in diecasting process was established by comparing the result of numerical analysis and an actual motor rotor. Solidification modulus was introduced to predict quantitatively the castability of aluminum diecasting process for motor rotor. It was found that there are minimum critical solidification modulus and slot width to prevent misrun according to core length through diecasting limit diagram proposed using the predictive method. The critical solidification modulus and slot width increase as core length increases to prevent misrun of aluminum motor rotor in diecasting process. Based on the results, the design criteria of slot shape to prevent misrun of aluminum motor rotor with various core length were established.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"37 1","pages":"10-17"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84544274","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 : 2015-12-31DOI: 10.7777/JKFS.2015.35.6.155
Bowen Kong, D. Cho, Pil-Hwan Yun, Jeong-Hun Lee, Jin-young Park, I. Park
The effect of Sr addition on mechanical and bio-corrosion properties of as-cast Mg-3wt.%Zn-0.5wt.%Ca-xwt.%Sr (x = 0.3, 0.6, 0.9) alloys were examined for application as biodegradable implant material. The microstructure, mechanical properties and corrosion resistance of the as-cast Mg-Zn-Ca-Sr alloys were characterized by using optical microscopy, scanning electron microscopy, tensile testing and electrochemical measurement in Hank's solution. The as-cast alloys contained -Mg and eutectic phases, while the alloys contained -Mg, and Mg-Zn-Ca-Sr intermetallic compound when the Sr addition was more than 0.3 wt.%. The yield strength, ultimate tensile strength and elongation increased with the increasing of Sr content up to 0.6 wt.% but decreased in the 0.9 wt.% Sr-added alloy, whereas the corrosion resistance of 0.3 wt.% Sr-added alloy was superior to other alloys. It was thought that profuse Mg-Zn-Ca-Sr intermetallic compound deteriorated both the mechanical properties and corrosion resistance of the as-cast alloy.
{"title":"Effect of Sr Addition on Mechanical and Corrosion Properties of Mg-Zn-Ca Alloy for Biodegradable Implant Material","authors":"Bowen Kong, D. Cho, Pil-Hwan Yun, Jeong-Hun Lee, Jin-young Park, I. Park","doi":"10.7777/JKFS.2015.35.6.155","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.6.155","url":null,"abstract":"The effect of Sr addition on mechanical and bio-corrosion properties of as-cast Mg-3wt.%Zn-0.5wt.%Ca-xwt.%Sr (x = 0.3, 0.6, 0.9) alloys were examined for application as biodegradable implant material. The microstructure, mechanical properties and corrosion resistance of the as-cast Mg-Zn-Ca-Sr alloys were characterized by using optical microscopy, scanning electron microscopy, tensile testing and electrochemical measurement in Hank's solution. The as-cast alloys contained -Mg and eutectic phases, while the alloys contained -Mg, and Mg-Zn-Ca-Sr intermetallic compound when the Sr addition was more than 0.3 wt.%. The yield strength, ultimate tensile strength and elongation increased with the increasing of Sr content up to 0.6 wt.% but decreased in the 0.9 wt.% Sr-added alloy, whereas the corrosion resistance of 0.3 wt.% Sr-added alloy was superior to other alloys. It was thought that profuse Mg-Zn-Ca-Sr intermetallic compound deteriorated both the mechanical properties and corrosion resistance of the as-cast alloy.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"20 1","pages":"155-162"},"PeriodicalIF":0.0,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83318721","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 : 2015-12-31DOI: 10.7777/JKFS.2015.35.6.170
B. Choi, Insoo Kim, J. Do, J. Jung, C. Jo
Segregation during solidification and homogenization during thermal exposure in GTD 111 were investigated. The microstructures of as-cast, standard heat-treated, and thermally exposed specimens were observed by SEM. A compositional analysis of each specimen was conducted by EDS. The dendrite core was enriched in W and Co, though lower levels of Ti and Ta were observed. An unexpected phase, in this case like the phase, was observed due to segregation near the eutectic in the standard heat-treated specimen. Segregation also induced microstructural evolution near the eutectic during the standard heat treatment. A quantitative analysis and microstructural observations showed that the thermal exposure at a high temperature enhanced the chemical homogeneity of the alloy.
{"title":"Variation of Alloying Element Distribution and Microstructure due to Microsegregation in Ni-base Superalloy GTD 111","authors":"B. Choi, Insoo Kim, J. Do, J. Jung, C. Jo","doi":"10.7777/JKFS.2015.35.6.170","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.6.170","url":null,"abstract":"Segregation during solidification and homogenization during thermal exposure in GTD 111 were investigated. The microstructures of as-cast, standard heat-treated, and thermally exposed specimens were observed by SEM. A compositional analysis of each specimen was conducted by EDS. The dendrite core was enriched in W and Co, though lower levels of Ti and Ta were observed. An unexpected phase, in this case like the phase, was observed due to segregation near the eutectic in the standard heat-treated specimen. Segregation also induced microstructural evolution near the eutectic during the standard heat treatment. A quantitative analysis and microstructural observations showed that the thermal exposure at a high temperature enhanced the chemical homogeneity of the alloy.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"8 1","pages":"170-177"},"PeriodicalIF":0.0,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87174635","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 : 2015-12-31DOI: 10.7777/JKFS.2015.35.6.141
N. Kim, Jeong-Min Kim
Aluminum-based hybrid parts were fabricated through a compound casting process with Al or Cu inserts which can be used for applications requiring high conductivity. Because the interface stability between the insert and the aluminum matrix is important, the effects of process variables on the interfacial adhesion strength were investigated. Additions of Cu and Mg to Al melt were found to enhance the adhesion strength, though the melt fluidity was slightly deteriorated when a small amount of Mg was added. An isothermal heating process after casting further improved the strength. However AlCu intermetallic compounds formed and their thickness increased during the heating process. As a result, deterioration in the interfacial adhesion strength was observed after an excessive annealing treatment.
{"title":"Interfacial Characteristics of Al/Cu Hybrid Materials Prepared by Compound Casting","authors":"N. Kim, Jeong-Min Kim","doi":"10.7777/JKFS.2015.35.6.141","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.6.141","url":null,"abstract":"Aluminum-based hybrid parts were fabricated through a compound casting process with Al or Cu inserts which can be used for applications requiring high conductivity. Because the interface stability between the insert and the aluminum matrix is important, the effects of process variables on the interfacial adhesion strength were investigated. Additions of Cu and Mg to Al melt were found to enhance the adhesion strength, though the melt fluidity was slightly deteriorated when a small amount of Mg was added. An isothermal heating process after casting further improved the strength. However AlCu intermetallic compounds formed and their thickness increased during the heating process. As a result, deterioration in the interfacial adhesion strength was observed after an excessive annealing treatment.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"58 1","pages":"141-146"},"PeriodicalIF":0.0,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73256432","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 : 2015-12-31DOI: 10.7777/JKFS.2015.35.6.163
Jae-Han Lim, Ji-Ho Ahn, B. Moon, Young-Jig Kim
This study reports the influence of gadolinium (Gd) addition on mechanical and corrosion properties of 2205 duplex stainless steel. In all alloys produced, regardless of the initial Gd content, Gd-based inclusions were well distributed in the duplex stainless steel matrix. As the Gd content increased from 0 wt% to 0.19 wt%, the ultimate tensile strength and hardness of the alloy increased from 630 MPa to 977 MPa and from 57 to 61, respectively, while elastic modulus, tensile elongation and impact energy of the alloy decreased. The critical crevice temperatures of Alloy1, Alloy2 and Alloy3 were , and , respectively.
{"title":"Influence of Gadolinium Addition on Mechanical and Corrosion Properties of 2205 Duplex Stainless Steel","authors":"Jae-Han Lim, Ji-Ho Ahn, B. Moon, Young-Jig Kim","doi":"10.7777/JKFS.2015.35.6.163","DOIUrl":"https://doi.org/10.7777/JKFS.2015.35.6.163","url":null,"abstract":"This study reports the influence of gadolinium (Gd) addition on mechanical and corrosion properties of 2205 duplex stainless steel. In all alloys produced, regardless of the initial Gd content, Gd-based inclusions were well distributed in the duplex stainless steel matrix. As the Gd content increased from 0 wt% to 0.19 wt%, the ultimate tensile strength and hardness of the alloy increased from 630 MPa to 977 MPa and from 57 to 61, respectively, while elastic modulus, tensile elongation and impact energy of the alloy decreased. The critical crevice temperatures of Alloy1, Alloy2 and Alloy3 were , and , respectively.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"206 1","pages":"163-169"},"PeriodicalIF":0.0,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76257594","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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