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Journal of Science and Technology of Metal最新文献

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Research on causes of hot-tearing of AA3003 aluminum billet during DC casting process AA3003铝坯在直流铸造过程中热撕裂的原因研究
Journal of Science and Technology of Metal Pub Date : 2021-04-28 DOI: 10.52923/vmfs.jstm.42021.95.05
Bach Dao Hong, Trung Trinh Van
{"title":"Research on causes of hot-tearing of AA3003 aluminum billet during DC casting process","authors":"Bach Dao Hong, Trung Trinh Van","doi":"10.52923/vmfs.jstm.42021.95.05","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.42021.95.05","url":null,"abstract":"AA3003 aluminum alloy made from raw scrap materials that have the advantage of economical use, but hottearing often occurs in the product billets of the direct chill casting process. This study used ANOVA analysis method for determination of chemical composition of AA3003 aluminum billet products to show influence of chemical composition on hot-tearing ability. The evaluation of the microstructure and chemical composition distribution of the elements by optical and scanning electron microscopes combined with energy dispersive spectroscopy showed the existence of impurities such as Cu, Zn, Fe, Pb exceeding the allowable limit in aluminum billets, especially at grain boundary, which can be the main reason for the hot-tearing of cast aluminum billets.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"158 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":"127457412","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
Carbon nanofibers grown on carbon fibers by chemical vapor deposition using the iron catalyst 采用化学气相沉积法在碳纤维上生长纳米碳纤维
Journal of Science and Technology of Metal Pub Date : 2021-04-28 DOI: 10.52923/vmfs.jstm.42021.95.04
Vuong Hoang Van, Duc Nguyen Van
{"title":"Carbon nanofibers grown on carbon fibers by chemical vapor deposition using the iron catalyst","authors":"Vuong Hoang Van, Duc Nguyen Van","doi":"10.52923/vmfs.jstm.42021.95.04","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.42021.95.04","url":null,"abstract":"Carbon nanofibers (CNFs) were synthesized by the catalytic chemical vapour deposition (CCVD) process using iron catalyst below the iron-carbon eutetic temperature (1147 oC). CNFs were formed on carbon fibers as substrates at the growth temperatures of 750, 800, and 850 oC. The effect of processing temperature on the formation and the morphology of CNFs was studied. Moreover, the effect of composition of gase mixture (C2H4, H2, and Ar) on the morphology of CNFs was also performed. The morphology and microstructure of as-obtained CNFs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron diffraction (ED). Results revealed that temperature and gas composition play an important role in forming of CNFs.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"1 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":"129932711","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 structure and properties of porous copper produced by powder metallurgy using NaCl as space holder agent 研究了以NaCl为空间保持剂的粉末冶金多孔铜的结构和性能
Journal of Science and Technology of Metal Pub Date : 2021-02-06 DOI: 10.52923/vmfs.jstm.22021.94.01
Trung Tran Bao, Phuong Doan Dinh, T. Nguyen Van, Hoan Trinh Minh, Cong Ngo Duy, Khanh Dang Quoc
{"title":"The structure and properties of porous copper produced by powder metallurgy using NaCl as space holder agent","authors":"Trung Tran Bao, Phuong Doan Dinh, T. Nguyen Van, Hoan Trinh Minh, Cong Ngo Duy, Khanh Dang Quoc","doi":"10.52923/vmfs.jstm.22021.94.01","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.22021.94.01","url":null,"abstract":"In this work, the porous copper samples were produced via the powder metallurgy using NaCl as the space holder. Cu and NaCl powders were mixed by a double-cone mixing machine and then pressed into the cylindrical pellets (12 mm in diameter) at the pressure of 100 MPa. The sintering was done in a tube furnace using hydrogen environment at 900 oC for 1h. After sintering, the samples were subjected to vibration in water for 3h to remove the NaCl particles. The results showed that the porous copper has been produced and NaCl has been completely removed after the ultrasonic process in distilled water. Using NaCl space holder, the porous structure has two types of pores: the macropore induced by the removement of NaCl and the micro-pore induced by the partial sintering of Cu powders. With increase of NaCl content from 0 to 20 wt.%, the porosity and permeability of the samples increased from 24 to 58 % and from 1.53×10-13 to 12.46×10-13 m2, respectively. However, the compressive strength of the samples has a decrease with the increase of porosity resulted from the increase of NaCl content.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121854233","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
Study on the burn-out of Ti and Al elements in the electroslag refining process 电渣精炼过程中钛、铝元素烧损的研究
Journal of Science and Technology of Metal Pub Date : 2021-02-06 DOI: 10.52923/vmfs.jstm.22021.94.02
Huy Nguyen Truong, Lam Nguyen Son, V. Nguyễn Hoàng, Thuyet Nguyen Minh
{"title":"Study on the burn-out of Ti and Al elements in the electroslag refining process","authors":"Huy Nguyen Truong, Lam Nguyen Son, V. Nguyễn Hoàng, Thuyet Nguyen Minh","doi":"10.52923/vmfs.jstm.22021.94.02","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.22021.94.02","url":null,"abstract":"In this paper the burn-out of the alloying elements Ti, Al in the electroslag refining was studied. The experiment was conducted on laboratory scale electroslag refining (ERS) equipment, the steel grades used in the study contain Ti and Al alloy elements. Experimental results showed that the burn-out ratio of Ti and Al in ESR was quite high. To minimize that ratio, it was possible to apply technological measures such as: using protective gas and selecting of an appropriate slag system, as well as combining additives containing Ti and Al for slag in the refining process. When applying these measures, the burning level of Ti and Al has decreased significantly compared to the previous one (from > 50 % to below 20 %). Especially in case of using the ANF-32 slag + 10 % TiO2 and conducting the operation of ESR under the Ar gas environment, the burn-out ratio of these alloy elements exhibited a negative value.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114118350","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
Study on methods to improve the impact toughness of steel 40XA 提高40XA钢冲击韧性的方法研究
Journal of Science and Technology of Metal Pub Date : 2019-08-28 DOI: 10.52923/vmfs.jstm.82019.85.02
Duong Nguyen Van, Quy Pham Van
{"title":"Study on methods to improve the impact toughness of steel 40XA","authors":"Duong Nguyen Van, Quy Pham Van","doi":"10.52923/vmfs.jstm.82019.85.02","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.82019.85.02","url":null,"abstract":"In this paper, methods of improving the toughness, eliminating the tempering embrittlement of steel 40XA (GOST 4543 -71) were used. The mechanical properties of this steel after conventional oil quenching followed by high temperature tempering with air cooling and with oil cooling after high temperature tempering were investigat- ed. Besides, a double quenching process consisting of a preliminary quenching from high temperature and a sec- ondary quenching with intermediate holding at sub-critical temperature was conducted. After this double quench- ing and high temperature tempering, the steel acquired mechanical properties (tensile strength, elongation and impact toughness) notably higher than the respective properties obtained by conventional heat treating. These research results can be applied to improve the mechanical properties of important details from this steel.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"06 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129451119","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
Effects of microstructure of 38XH3MΦA steel on abrasion wear of instrument 38XH3MΦA钢组织对仪器磨损的影响
Journal of Science and Technology of Metal Pub Date : 2017-02-28 DOI: 10.52923/vmfs.jstm.22017.70.02
Duong Nguyen Van, Tuan Pham Ngoc
{"title":"Effects of microstructure of 38XH3MΦA steel on abrasion wear of instrument","authors":"Duong Nguyen Van, Tuan Pham Ngoc","doi":"10.52923/vmfs.jstm.22017.70.02","DOIUrl":"https://doi.org/10.52923/vmfs.jstm.22017.70.02","url":null,"abstract":"This paper concerns with effects of various types of microstructure on machinability of 38XH3MΦA steel. The machinability of steel is preliminarily evaluated by measuring the abrasion wear of end mill cutters upon machining samples of different microstructures in the same cutting condition. The obtained results can be the base for choos- ing optimal microstructure to machine this type of steel.","PeriodicalId":313761,"journal":{"name":"Journal of Science and Technology of Metal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130335207","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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