Acta Metallurgica Slovaca最新文献_第4页

PRELIMINARY INVESTIGATION INTO MECHANICAL PROPERTIES AND MICROSTRUCTURAL BEHAVIOUR OF INCONEL ALLOY UNDER WELDED AND UNWELDED CONDITIONS 焊接和非焊接条件下铬镍铁合金力学性能和显微组织行为的初步研究

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Acta Metallurgica Slovaca Pub Date : 2023-03-23 DOI: 10.36547/ams.29.1.1664

Saurabh Dewangan, Sharath Narayanan, Gurbaaz Singh Gill, Utkarsh Chadha

引用次数: 1

improvement of tensile properties of low-carbon steels via short-time intercritical annealing 短时临界间退火对低碳钢拉伸性能的改善

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Acta Metallurgica Slovaca Pub Date : 2023-03-23 DOI: 10.36547/ams.29.1.1709

M. S. Mohsenzadeh

{"title":"improvement of tensile properties of low-carbon steels via short-time intercritical annealing","authors":"M. S. Mohsenzadeh","doi":"10.36547/ams.29.1.1709","DOIUrl":"https://doi.org/10.36547/ams.29.1.1709","url":null,"abstract":"The effect of low volume fraction formation of martensite on the tensile properties of low carbon steel was evaluated. First, steel samples with ferrite-cementite microstructure were produced. The thermomechanical treatment used included austenitizing at 1000 °C and then quenching in ice brine solution, tempering the obtained martensitic structure for 1 h at 650 °C, 80% cold rolling, and re-tempering for 2 h at 650 °C. In order to form a low volume fraction of martensite, steel samples with ferrite-cementite microstructure were intercritically annealed for 30 seconds at 740 °C. As a result of intercritical annealing treatment, 6.2% martensite was formed. The results of tensile test showed that the formation of 6.2% martensite led to the elimination of yield point phenomenon and Lüders banding, decrease of yield stress and increase of true stress at maximum load, while true uniform strain did not change significantly. The work hardening rate also increased significantly. Based on the results of modeling of the flow behavior with the Holloman equation, the work hardening capability of the steel sample including ferrite-cementite decreased after a certain plastic strain, while the work hardening capacity remained constant with the formation of a low volume fraction of martensite in the microstructure.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47646233","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

Case study of advanced processed OFHC copper by dry sliding wear test 先进加工OFHC铜干式滑动磨损试验研究

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Acta Metallurgica Slovaca Pub Date : 2023-03-23 DOI: 10.36547/ams.29.1.1734

R. Bidulský, J. Bidulská, T. Kvačkaj, M. Grande

引用次数: 0

COMPARISON OF FINISHING MILLING STRATEGIES USING TOPOGRAPHY OF THE MACHINED SURFACE 利用加工表面形貌的精铣策略比较

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Acta Metallurgica Slovaca Pub Date : 2023-03-23 DOI: 10.36547/ams.29.1.1763

J. Varga, Peter Ižol, Ľ. Kaščák, M. Vrabeľ, A. Kubit

{"title":"COMPARISON OF FINISHING MILLING STRATEGIES USING TOPOGRAPHY OF THE MACHINED SURFACE","authors":"J. Varga, Peter Ižol, Ľ. Kaščák, M. Vrabeľ, A. Kubit","doi":"10.36547/ams.29.1.1763","DOIUrl":"https://doi.org/10.36547/ams.29.1.1763","url":null,"abstract":"The plastics processing and injection molding industry is known for the fact that the future molded part contains a variety of geometric shapes and, in some cases, free surfaces. To produce these shapes, knowledge of CAM systems is required to enable the programmer to select the necessary milling strategies designed to achieve the best possible quality and dimensional accuracy. However, it is equally necessary to understand and appreciate the effect of each strategy and which strategy is best suited for a given type of surface. The paper compares finishing milling strategies by evaluating the topography of the machined surface. The material was AlCu4Mg aluminium alloy, where Constant-Z and Spiral strategy – circle-type finishing strategies were selected for the production process. Surface topography analysis was evaluated and compared at three different heights of the produced part with respect to the tool contact with the machined surface, which showed a variation in toolpaths and therefore also in the quality of machining. The surface topography results demonstrated the Constant Z strategy to be the more suitable strategy for producing the shaped surface, which achieved uniform toolpaths over the whole height of the part.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48934085","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

EFFECT OF ULTRAFAST HEATING ON AISI 441 FERRITIC STAINLESS STEEL 超快加热对aisi 441铁素体不锈钢的影响

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Acta Metallurgica Slovaca Pub Date : 2023-03-23 DOI: 10.36547/ams.29.1.1713

G. Stornelli, L. Albini, P. E. Di Nunzio, Giulia Tiracorrendo, B. R. Rodriguez vargas, A. Di schino

引用次数: 2

NUMERICAL AND EXPERIMENTAL STUDIES ON CLINCH-BONDED HYBRID JOINING OF STEEL SHEET DX53D+Z dx53d + z钢板夹接复合连接的数值与试验研究

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1657

Ľ. Kaščák, Denis Cmorej, J. Slota, E. Spišák, J. Varga

引用次数: 0

Effects of aluminium addition and austempering temperatures on Al-alloyed ductile iron microstructure and mechanical properties 铝添加和等温淬火温度对铝合金球墨铸铁组织和力学性能的影响

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1598

A. Adebayo, O. Ajibola, O. Falodun, Sunday G. Borisade, A. Owa, Oluwole D Adigun, A. Oyetunji, K. Alaneme

{"title":"Effects of aluminium addition and austempering temperatures on Al-alloyed ductile iron microstructure and mechanical properties","authors":"A. Adebayo, O. Ajibola, O. Falodun, Sunday G. Borisade, A. Owa, Oluwole D Adigun, A. Oyetunji, K. Alaneme","doi":"10.36547/ams.28.4.1598","DOIUrl":"https://doi.org/10.36547/ams.28.4.1598","url":null,"abstract":"The research investigates the effect of varying amounts of aluminium (1.05, 1.575, 2.29, 3.02 and 3.74 wt.%) addition and heat treatment (austempering at 300, 350, 400 oC) on the microstructure and mechanical properties of ductile cast iron alloys. The graphitizing effects of the Al alloy and varied austempering temperatures on hardness, tensile strength, and impact toughness of the ductile cast iron (DCI) were evaluated. The results of the influences of Al addition and heat treatment on the properties of the DCI determined were presented as graphical data while the microstructures were done by using a scanning electron microscope (SEM). The microstructures revealed that the addition of Al into the matrix brings about the precipitation of ferrite around the graphite nodules. The combined effects of the increase Al content and austempering temperatures produced greater hardness values on the Al-alloyed DCI samples than the as-cast sample. The hardness value for the entire sample ranged between 27.25 to 57.03 BHN. Tensile strength increased with an increase in Al content and lower austempering temperatures, whereas, the impact toughness increased with an increase in Al content and higher austempering temperature.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46342927","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

MICROSTRUCTURE AND TENSILE PROPERTIES OF A RECENT INTER-CRITICALLY AUSTENITIZED QUENCHED AND PARTITIONED STEEL 一种新型临界间奥氏体淬火分区钢的组织和拉伸性能

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1578

Hoda Refaiy, Mai Fouad, Hoda Nasr El-Din, Eman H. El-shenawy

{"title":"MICROSTRUCTURE AND TENSILE PROPERTIES OF A RECENT INTER-CRITICALLY AUSTENITIZED QUENCHED AND PARTITIONED STEEL","authors":"Hoda Refaiy, Mai Fouad, Hoda Nasr El-Din, Eman H. El-shenawy","doi":"10.36547/ams.28.4.1578","DOIUrl":"https://doi.org/10.36547/ams.28.4.1578","url":null,"abstract":"Quenched and partitioned steel is a promising grade of advanced high-strength steel \"Third Generation\" for industrial applications such as the automotive industry. This research aimed to develop a novel ultra-high-strength quenched and partitioned steel with good ductility from a novel alloy with the composition of 0.37C- 3.65Mn- 0.65Si- 0.87Al- 1.5Ni-0.05P, wt.% which is non-standard. This quenched and partitioned steel was developed by inter-critical austenitization followed by quenching to a temperature below Martensite start temperature (80 and 120 oC), then partitioning at 450 oC for different times (20, 40, 60, 100, 140, and 180 s). Scanning electron microscope and X-Ray diffraction were utilized to investigate the microstructure and retained austenite characteristics. The tensile properties of developed Q&P specimens were also investigated. The results demonstrated that the specimen quenched at 120 oC and partitioned for 180s achieved a maximum strength elongation balance of 26 GPa.%. Both the specimens quenched at 80 and 120 oC displayed a decrease in strength values with extending holding time due to the tempering of primary martensite. Increasing partitioning time for the specimens quenched at 120 oC led to enhancing elongation, where a maximum total elongation of 19.7% was achieved for the partitioning time of 180s. \u0000 ","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44907822","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

CIRCULAR ECONOMY APPLIED TO METHANE PRODUCTION FROM NATURAL GAS HYDRATE RESERVOIRS: POTENTIALITIES OF RESIDUAL DUST COMING FROM STEEL PLANTS 循环经济在天然气水合物甲烷生产中的应用:钢铁厂残余粉尘的潜力

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1632

G. Stornelli, A. Gambelli, A. Di schino, G. Zucca, F. Rossi

{"title":"CIRCULAR ECONOMY APPLIED TO METHANE PRODUCTION FROM NATURAL GAS HYDRATE RESERVOIRS: POTENTIALITIES OF RESIDUAL DUST COMING FROM STEEL PLANTS","authors":"G. Stornelli, A. Gambelli, A. Di schino, G. Zucca, F. Rossi","doi":"10.36547/ams.28.4.1632","DOIUrl":"https://doi.org/10.36547/ams.28.4.1632","url":null,"abstract":"Natural gas hydrate represents one of the most promising solutions to answer to the constantly increasing energy demand; in addition, the possibility of recover methane via carbon dioxide injection, with a theoretical exchange ratio equal to 1, makes it a potential carbon neutral energy source. Among them, energetical costs associated to practical operations in marine deposits. The use of chemical inhibitors and or promoters to improve the exchange process is gaining increasing interest and researchers are mainly focused on finding less environmental unfriendly additives and on reducing their costs. In that direction, the present work deals with the possible use of waste dust, produced during steel mill processes, as promoter of the CO2/CH4 replacement process. That sand commonly contains a great variety of compounds, such as metal oxides, alumina, salts, and so on. Some of them have a chemical composition close to well-known hydrate inhibitors/promoters. Moreover, that application could be a further energetic cycle for a waste product. In this work, both methane and carbon dioxide hydrate formation were tested in absence and in presence of cupper oxides, with different concentrations. Hydrate formation and dissociation results where then compared among each other and with hydrate equilibrium values for those compounds.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46279621","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 RETAINED AUSTENITE ON PLASTIC CHARACTERISTICS OF DUAL PHASE STEELS 残余奥氏体对双相钢塑性特性的影响

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Acta Metallurgica Slovaca Pub Date : 2022-12-13 DOI: 10.36547/ams.28.4.1653

Peter Prislupcak, T. Kvačkaj, J. Bidulská, S. Németh, M. Demčáková, R. Gburík, Vladimír Kundracík

引用次数: 0