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Journal of Science and Technology of Metal最新文献

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Structure evolution of a magnetite iron ore/carbon composite pellet during solid-state reduction under microwave heating 磁铁矿/碳复合球团在微波加热下固态还原过程中的结构演化
Journal of Science and Technology of Metal Pub Date : 2021-10-28 DOI: 10.52923/vmfs.jstm.102021.98.01
Cuong Phung Kien, Dung Ngo Quoc, A. Do Thi, Hieu Nguyen Sy, Tuyen Ngo Duc, Tung Nguyen Quang, Thu Chu Thi Minh, Khoi Lai Vinh, Chien Do Nguyen Quang, Oanh Nguyen Thi Hoang, V. Nguyễn Hoàng
{"title":"Structure evolution of a magnetite iron ore/carbon composite pellet during solid-state reduction under microwave heating","authors":"Cuong Phung Kien, Dung Ngo Quoc, A. Do Thi, Hieu Nguyen Sy, Tuyen Ngo Duc, Tung Nguyen Quang, Thu Chu Thi Minh, Khoi Lai Vinh, Chien Do Nguyen Quang, Oanh Nguyen Thi Hoang, V. Nguyễn Hoàng","doi":"10.52923/vmfs.jstm.102021.98.01","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.102021.98.01","url":null,"abstract":"In the present study, the structure evolution under direct reduction of a Minh-Son magnetite iron ore/carbon composite pellets in a microwave-heating kiln under different microwave wattage of 60 and 90 % (with the firing time from 15 to 120 min.) was investigated. The microstructure of the pellets was characterized by scanning electron microscopy coupled with energy dispersive spectroscopy and X-ray diffraction (XRD). The phase formation was indexed using MDI Jade from the peaks matching the reference sample. At the microwave’s wattage of 60 %: the wustite (FeO) has appeared after firing time of 60 min., the metallic iron and fayalite have appeared in the reduced samples after firing time of 90 min. to 120 min. with retained phases of Fe203, Fe304, FeO and Si02– While at the microwave’s wattage of 90 %, the metallic iron has appeared in the reduced samples after firing time of 30 min. to 120 min and fayalite has appeared in the reduced samples after firing time of 60 min. to 120 min. The final reduced pellet, under microwave’s wattage of 90 % and firing time of 120 min., shows the only phases of metallic iron and fayalite according to the XRD resolution. The present work could provide a scientific understanding to illustrate iron ore/carbon composite pellet behavior during solid-state carbothermic reduction under a microwave-heating.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"285 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123730300","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 heat and surface pre-treatment processes on the nitriding ability of stainless steel SUS420 热处理和表面预处理工艺对SUS420不锈钢渗氮性能的影响
Journal of Science and Technology of Metal Pub Date : 2021-10-28 DOI: 10.52923/vmfs.jstm.102021.98.04
Thanh Nguyen Van, Linh Nguyen Thi, Anh Pham Hoang, Trung Trinh Van
{"title":"Effect of heat and surface pre-treatment processes on the nitriding ability of stainless steel SUS420","authors":"Thanh Nguyen Van, Linh Nguyen Thi, Anh Pham Hoang, Trung Trinh Van","doi":"10.52923/vmfs.jstm.102021.98.04","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.102021.98.04","url":null,"abstract":"As-supplied SUS420 stainless steel was annealed at 880 °C for1 h and quenched (1040 °c, 30 min), followed by tempering at 530 °c for 1 h. The sample surface after tempering was polished with different roughness levels by mechanical grinding. Samples in the states of as-annealed, as-quenched and as-tempered samples as well as ground tempered ones with different surface roughness were gas nitrided with NH3 gas at 520 °c for 5 h. The microstructure and mechanical properties of SUS420 steel before and after the heat and surface treatments were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, and micro-hardness testing. The results show that if the natural oxide layer on the surface of the SUS420 samples was not removed, the nitriding process was very difficult or even imposible. The annealed steel gave the highest nitriding depth but low surface hardness. The samples after quenching and/or tempering had lower nitriding depth but higher hardness. The surface hardness of the as-supplied steel (333 HV) decreased with annealing (181 HV). After quenching, tempering, and gas nitriding, the values were 632, 560 and > 1000 HV, respectively. The samples after nitriding showed the appearance of fine CrN phase in the nitrided layer. The highest nitriding depth (125 pm) was obtained for the annealed samples, and subsequently decreased for the quenched samples and tempered samples. The lower the roughness of the sample, the higher is the hardness. The nitrided layer thickness tended to increase as the roughness decreased.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116201761","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
Zinc carbonate recovery from brass melting slag 从黄铜熔渣中回收碳酸锌
Journal of Science and Technology of Metal Pub Date : 2021-10-28 DOI: 10.52923/vmfs.jstm.102021.98.03
Thao Nguyen Thi, Nam Pham Ky, Ngoc Tran Vu Diem
{"title":"Zinc carbonate recovery from brass melting slag","authors":"Thao Nguyen Thi, Nam Pham Ky, Ngoc Tran Vu Diem","doi":"10.52923/vmfs.jstm.102021.98.03","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.102021.98.03","url":null,"abstract":"Brass melting slag (20.38 wt.% Zn) was leached in sulfuric acid with concentration of (50 + 80) g/l H2SO4, leaching temperature of (30 + 60) °C for (30 + 120) min. The optimized conditions for 94.16% Zn extraction from brass melting slag were found as 70 g/l H2SO4, room temperature and 90 min. The leaching solution was purified by removal of Fe through Fe(OH)3 precipitation when adding ZnO to adjust pH value of 5. The solution was continuously cemented by Zn metal at 60 °C for 60 min to obtain Cu metal with high purity of 99 wt.% Cu. The purified solution with 37.64 g/l Zn was modified by Na2C03 to have pH value of about 6 and precipitation of ZnC03 (94.14 %).","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970694","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 the smelting process of low carbon steel scrap and sponge iron in medium frequency induction furnace for production of front bumper beams 生产前保险杠横梁用中频感应炉熔炼废钢和海绵铁的工艺研究
Journal of Science and Technology of Metal Pub Date : 2021-10-28 DOI: 10.52923/vmfs.jstm.102021.98.02
Dung Ngo Quoc, V. Nguyễn Hoàng
{"title":"A Study on the smelting process of low carbon steel scrap and sponge iron in medium frequency induction furnace for production of front bumper beams","authors":"Dung Ngo Quoc, V. Nguyễn Hoàng","doi":"10.52923/vmfs.jstm.102021.98.02","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.102021.98.02","url":null,"abstract":"MS1200 steel grade is now widely utilized in the automotive sector because it is a good solution for the current trend of vehicle chassis frame construction. This research presents a technology procedure for producing MS1200 steel grade from low carbon steel scrap and sponge iron – a product of MIREX Vietnam. The smelting using up to 30 % sponge iron briquettes combined with low carbon scrap, FeSi, FeMn, FeCr, FeTi,… was realized in a medium frequency induction furnace. The heat treatment for forged steel was performed to obtain required properties. The steel product has the following properties: tensile strength σb = 1280 MPa, yield strength σ0.2 = 990 MPa and impact toughness ak = 769 J/mm2, that meets the need of industrial use.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129113460","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 die radius on thickness distribution of SS304 stainless steel sheet in deep drawing of cylindrical cup 圆柱杯深拉深成形时模具半径对SS304不锈钢板厚分布的影响
Journal of Science and Technology of Metal Pub Date : 2021-08-28 DOI: 10.52923/vmfs.jstm.82021.97.01
Giang Lai Dang, Hoan Tran Duc, Tan Le Trong, Duc Ong The
{"title":"The effect of die radius on thickness distribution of SS304 stainless steel sheet in deep drawing of cylindrical cup","authors":"Giang Lai Dang, Hoan Tran Duc, Tan Le Trong, Duc Ong The","doi":"10.52923/vmfs.jstm.82021.97.01","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.82021.97.01","url":null,"abstract":"Thickness distribution of deep drawing products has been studied in recent decades since it has a significant influence on the product quality. In this paper a numerical simulation with experimental verification was conducted to examine the influence of die radius on the thickness distribution of cilindrical cup in deep drawing for SS304 stainless steel. Thickness distribution of the cup was analyzed through the stress-strain state during deep drawing by Deform 3D software. The obtained results allow choosing a reasonable die radius to achieve more uniform wall thickness of the cup, that optimizes tool design and reduces manufacturing costs.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122324376","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
Metallurgical properties of iron ore pellet when using lime powder instead of bentonite 石灰粉代替膨润土对铁矿球团冶金性能的影响
Journal of Science and Technology of Metal Pub Date : 2021-08-28 DOI: 10.52923/vmfs.jstm.82021.97.02
Hien Tran Thị Thu, Kien Nguyen Ngoc, Yen Nguyen Duc
{"title":"Metallurgical properties of iron ore pellet when using lime powder instead of bentonite","authors":"Hien Tran Thị Thu, Kien Nguyen Ngoc, Yen Nguyen Duc","doi":"10.52923/vmfs.jstm.82021.97.02","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.82021.97.02","url":null,"abstract":"This paper reported effects of lime powder and bentonite binder using in iron ore pelletization on metallurgical properties of pellets as green strength, compressive strength and degree of reduction. The investigated pellets contain 0, 1 and 2 mass % of lime powder and 2, 1 and 0 mass % of bentonite, respectively. Green balls were dried (105 °c for 24 hours) then heated at 1200 °c for 30 minutes. The reductibility of fired pellets was examined at different temperatures of 900, 1000 and 1100 °c with various holding time (45, 90 and 120 minutes). The results showed that the combination of 1 mass % of bentonite and 1 mass % of lime powder in the pellet gave the most apropriate metallurgical properties of pellets as green strength, porosity and degree of reduction. This material charging ratio can be recommended for application in manufacturing of the pellet.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134319890","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
Design of metal casting mold for ADC 12 aluminium alloy with assistance of 20 kHz ultrasonic vibration 20khz超声辅助下adc12铝合金金属铸造模具设计
Journal of Science and Technology of Metal Pub Date : 2021-08-28 DOI: 10.52923/vmfs.jstm.82021.97.04
Hai Nguyen Thanh, Tri Pham Huu, Tung Le Thanh, Thien Vo Tan, Qui Dao Duy, Khanh Bui Duy
{"title":"Design of metal casting mold for ADC 12 aluminium alloy with assistance of 20 kHz ultrasonic vibration","authors":"Hai Nguyen Thanh, Tri Pham Huu, Tung Le Thanh, Thien Vo Tan, Qui Dao Duy, Khanh Bui Duy","doi":"10.52923/vmfs.jstm.82021.97.04","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.82021.97.04","url":null,"abstract":"Metal mold casting is widely used in industry because of higher accuracy than sand casting and lower cost than diecasting. Metal mold casting can yield products with complex shapes and adjustable cooling rate. In this work, designing and fabrication of 20 kHz ultrasonic assisted mold casting using 20Cr steel are studied. Some major components such as motor, heater power, melting chamber are selected and calculated. Model for heating and pouring the ADC 12 alloy is designed. Samples with and without ultrasonic vibration are investigated using 3D laser scan.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130092389","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 two-step heating on transparency of MgAl2O4 ceramics fabricated by pulsed electric current sintering process 两步加热对脉冲电流烧结MgAl2O4陶瓷透明度的影响
Journal of Science and Technology of Metal Pub Date : 2021-04-28 DOI: 10.52923/vmfs.jstm.42021.95.02
Khanh Dang Quoc, Yen Nguyen Ngoc, Tuan Dao Anh, Thang Le Hong, H. Le Minh
{"title":"Effect of two-step heating on transparency of MgAl2O4 ceramics fabricated by pulsed electric current sintering process","authors":"Khanh Dang Quoc, Yen Nguyen Ngoc, Tuan Dao Anh, Thang Le Hong, H. Le Minh","doi":"10.52923/vmfs.jstm.42021.95.02","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.42021.95.02","url":null,"abstract":"In this work, MgAl2O4 transparent ceramics was fabricated from combustion-synthesized nanopowders by pulsed electric current sintering (PECS) combined with two-step sintering. Ceramic powder was densitified using two-step heating, namely the first-step temperature was 1100 oC with holding time of 60 min and the second-step temperatures in range from 1300 oC to 1450 oC with 20 min duration. The results showed that the transparent ceramic samples sintered at 1100 oC/60 min – 1400 oC/20 min had grain size of 177 ± 8 nm, relative density about 99 %, transmittance up to 80 %, and Vickers hardness of 18 GPa. These values were higher than that of samples obtained by one-step sintering at 1400 oC.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122208529","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
Soft annealing technology applied to high chromium white cast iron 软退火技术在高铬白口铸铁中的应用
Journal of Science and Technology of Metal Pub Date : 2021-04-28 DOI: 10.52923/vmfs.jstm.22021.94.03
Minh Nguyen Ngoc
{"title":"Soft annealing technology applied to high chromium white cast iron","authors":"Minh Nguyen Ngoc","doi":"10.52923/vmfs.jstm.22021.94.03","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.22021.94.03","url":null,"abstract":"High Cr white cast iron is an alloy widely used in the field of manufacturing parts working in conditions of high wear resistance. However, the machining process for this alloy is often difficult due to its high hardness. Therefore, the objective of this study is to find out the appropriate parameters of heat treatment process to be able for softening of high Cr white cast iron with a lower hardness, ensuring the cutting process. In this study, the samples were austenitized partially and soft annealed in a resistance furnace. Optical microscope, X-ray diffractometer and field emission scanning electron microscope were used to observe and evaluate the microstructure of samples before and after heat treatment. The Rockwell hardness tester (RHT) is also used to evaluate hardness variation of samples. Research results have shown that the change of primary carbide grain size and formation of secondary carbides during heat treatment can reduce the hardness of white cast iron to the suitable range for machining.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124894352","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
Simulation on temperature fields and phase transformation of 316L stainless steel tubes during Orbital – TIG auto welding process 316L不锈钢管轨道- TIG自动焊接过程温度场及相变模拟
Journal of Science and Technology of Metal Pub Date : 2021-04-28 DOI: 10.52923/vmfs.jstm.42021.95.01
Manh Ngo Huu
{"title":"Simulation on temperature fields and phase transformation of 316L stainless steel tubes during Orbital – TIG auto welding process","authors":"Manh Ngo Huu","doi":"10.52923/vmfs.jstm.42021.95.01","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.42021.95.01","url":null,"abstract":"Orbital - TIG (OT) auto welding process was applied for the weld connection of the fixed pipe lines. The heat distribution of the OT welding has influenced phase transformation and quality of the weld. In this paper, the temperature fields and phase transformation of 316L stainless steel pipes have been simulated during OT auto welding process. The numerical simulation has been used and supported by the JMATPRO 7.0 and SYSWELD softwares.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124779292","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
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