Acta Metallurgica Slovaca最新文献_第8页

Sm-Co ALLOYS COERCIVITY PREDICTION USING STACKING HETEROGENEOUS ENSEMBLE MODEL 用叠加非均匀镶嵌模型预测Sm-Co合金矫顽力

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Acta Metallurgica Slovaca Pub Date : 2021-12-07 DOI: 10.36547/ams.27.4.1173

A. Trostianchyn, Z. Duriagina, I. Izonin, R. Tkachenko, V. Kulyk, O. Pavliuk

{"title":"Sm-Co ALLOYS COERCIVITY PREDICTION USING STACKING HETEROGENEOUS ENSEMBLE MODEL","authors":"A. Trostianchyn, Z. Duriagina, I. Izonin, R. Tkachenko, V. Kulyk, O. Pavliuk","doi":"10.36547/ams.27.4.1173","DOIUrl":"https://doi.org/10.36547/ams.27.4.1173","url":null,"abstract":"The use of machine learning tools in modern materials science can significantly reduce the duration and cost of developing new materials and improving the properties of existing ones. This is especially true in studying expensive and strategic importance materials like alloys of rare earth metals, which are used to manufacture high-energy permanent magnets. At the same time, single machine learning algorithms do not always provide the accuracy required to solve a particular applied task. Therefore, the current paper aimed to develop an ensemble model for predicting the magnetic properties of Sm-Co system alloys with high accuracy. Based on literature data, we have collected the dataset of the relationship between phase composition, sample state, crystallographic orientation, microstructure, and magnetic properties. We have compared different machine learning algorithms. A stacking ensemble model was designed based on high-precision machine learning algorithms: Neural Networks, AdaBoost, Gradient Boosting, and Random Forest algorithm. The proposed ensemble scheme showed a significant increase in the accuracy for predicting the magnetic properties of Sm-Co alloys on the example of coercivity.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48669291","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: 4

The effect of eggshell as a reinforcement on the mechanical and Corrosion properties of Mg-Zn-Mn matrix composite 蛋壳增强剂对Mg-Zn-Mn基复合材料力学性能和腐蚀性能的影响

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Acta Metallurgica Slovaca Pub Date : 2021-12-07 DOI: 10.36547/ams.27.4.1088

Hasan A. Fattah, M. Gouda, S. Salman, A. Elsayed

引用次数: 2

PRODUCTION OF IRON ORE PELLETS BY UTILIZATION OF SUNFLOWER HUSKS 利用向日葵壳生产铁矿石球团

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Acta Metallurgica Slovaca Pub Date : 2021-12-07 DOI: 10.36547/ams.27.4.1052

A. Koveria, L. Kieush, M. Boyko, Maksym Yaholnyk, Natalia Poliakova

{"title":"PRODUCTION OF IRON ORE PELLETS BY UTILIZATION OF SUNFLOWER HUSKS","authors":"A. Koveria, L. Kieush, M. Boyko, Maksym Yaholnyk, Natalia Poliakova","doi":"10.36547/ams.27.4.1052","DOIUrl":"https://doi.org/10.36547/ams.27.4.1052","url":null,"abstract":"Steel production is the most dynamic industry and one of the key sectors for the development of the global economy. The growing production of iron ore increases the need for its beneficiation and granulating for subsequent use in the production of iron and steel. As a result, the number of CO2 emissions and harmful substances increases, which negatively affects both society and the environment. It is important to study the use of biomass for the production of iron ore pellets. Lignocellulosic biomass is a renewable and sustainable source of heat and energy that can mitigate climate change. The efficiency of using sunflower husks on the combined machine “straight grate - rotary kiln - annular cooler” to partially replace natural gas in the production of iron ore pellets has been studied. The influences of alternative fuel use on technological indicators of the process and quality of iron ore pellets have been analyzed. It was found that the combustion of sunflower husks generates enough heat to obtain iron ore pellets with good strength. The main indicators of the quality of iron ore pellets remain at the same level as the iron ore pellet quality when using natural gas.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46740530","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: 3

FORMING PROCESS SIMULATION OF BIMETALLIC BILLET BY EXTRUSION FOR REW METHOD REW法挤压双金属坯料成形过程模拟

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Acta Metallurgica Slovaca Pub Date : 2021-12-07 DOI: 10.36547/ams.27.4.1254

A. Schrek, A. Brusilová, P. Sejč, B. Vanko

引用次数: 1

The Effect of Different Pre-Surface Finishing Method on the Aluminium Anodization of the 6XXX Series Alloy 不同表面前处理方法对6XXX系列合金铝阳极氧化的影响

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Acta Metallurgica Slovaca Pub Date : 2021-12-07 DOI: 10.36547/ams.27.4.1109

Merve Özcan, Bilge Tunca, Ipek Biltaş, T. Tuken

引用次数: 1

EFFECT OF COOLING RATE ON MICROSTRUCTURE AND HARDNESS IN GRAY CAST IRON CASTING PROCESS 灰口铸铁冷却速度对组织和硬度的影响

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Acta Metallurgica Slovaca Pub Date : 2021-09-13 DOI: 10.36547/ams.27.3.996

A. Yulianto, R. Soenoko, W. Suprapto, A. Sonief

引用次数: 0

THE EFFECT OF MATERIAL MODELS IN THE FEM SIMULATION ON THE SPRINGBACK PREDICTION OF THE TRIP STEEL 有限元模拟中材料模型对TRIP钢回弹预测的影响

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Acta Metallurgica Slovaca Pub Date : 2021-09-13 DOI: 10.36547/ams.27.3.899

P. Mulidrán, E. Spišák, M. Tomáš, J. Majerníková, Ján Varga

{"title":"THE EFFECT OF MATERIAL MODELS IN THE FEM SIMULATION ON THE SPRINGBACK PREDICTION OF THE TRIP STEEL","authors":"P. Mulidrán, E. Spišák, M. Tomáš, J. Majerníková, Ján Varga","doi":"10.36547/ams.27.3.899","DOIUrl":"https://doi.org/10.36547/ams.27.3.899","url":null,"abstract":"In this work, the influence of material models used in the FEM simulation on the springback prediction is investigated. The interest of this paper is to extend the knowledge base regarding springback predictions in numerical simulation. The springback effect of a V-shaped sheet metal part made of TRIP steel, with a thickness of 0.75 mm was investigated. The bending angle was set to 90°. In the numerical simulation, Hill48 and Barlat yield criteria were used in combination with Ludwik's and Swift's hardening models. Achieved data from the numerical simulations were compared and evaluated with experimental test results. The experimental results showed the relation between springback and calibration force. The effect of specimen cut direction on the springback was smaller in comparison with the calibration force. The numerical results of the springback were not identical with the experimentally achieved springback values in most cases. Particularly, when a calibration force of 1 800 N was used in the simulation. The simulation results showed a good correlation between experimental and numerical results, when Hill48 and Barlat yield criteria were used in combination with Ludwik hardening law and calibration force F with the value 900 N was applied.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42038721","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: 2

IMPACT OF COLD PLASTIC DEFORMATION AND THERMAL POST-TREATMENT ON THE PHYSICAL PROPERTIES OF COPPER BASED ALLOYS Al-BRONZE AND α-BRASS 冷塑性变形和热后处理对铜基合金Al、青铜和α-黄铜物理性能的影响

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Acta Metallurgica Slovaca Pub Date : 2021-09-13 DOI: 10.36547/ams.27.3.951

Samiul Kaiser, M. S. Kaiser

{"title":"IMPACT OF COLD PLASTIC DEFORMATION AND THERMAL POST-TREATMENT ON THE PHYSICAL PROPERTIES OF COPPER BASED ALLOYS Al-BRONZE AND α-BRASS","authors":"Samiul Kaiser, M. S. Kaiser","doi":"10.36547/ams.27.3.951","DOIUrl":"https://doi.org/10.36547/ams.27.3.951","url":null,"abstract":"The copper based alloys Al-bronze and α-brass containing each of 10wt% aluminum and zinc were prepared by casting. Afterwards, the specimens were cold-rolled with various percentages of deformation and the cold-rolled samples were aged subsequently at the varied time for four hours and temperatures ranging up to 500°C. Samples underwent characterizations by microhardness testing, electrical resistivity, optical properties, differential scanning calorimetry as well as microstructure analysis using an optical microscope. The results showed that the hardening of Cu-based alloys was taken place due to solid-solution hardening. Al addition accelerated the hardness through ageing due to the formation of various intermetallic copper aluminites into the aged alloy which was hard and brittle in nature. The resistivity decreased marginally through heat treatment due to the stage of stress relieving, recovery, precipitation coarsening as well as recrystallization and increased for arranging different intermetallics into the alloys. The microstructural study revealed that the cold rolled alloys content the different phases of elongated grain at the rolling direction. Meanwhile higher ageing temperatures at 500°C for one hour led to recrystallization and grain growth especially in pure copper and Cu-10Zn alloys.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41764192","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

ELECTROCHEMICAL POLYMORPHIC PHASE FORMATION IN METALS 金属中电化学多晶相的形成

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Acta Metallurgica Slovaca Pub Date : 2021-09-13 DOI: 10.36547/ams.27.3.1011

O. Girin

{"title":"ELECTROCHEMICAL POLYMORPHIC PHASE FORMATION IN METALS","authors":"O. Girin","doi":"10.36547/ams.27.3.1011","DOIUrl":"https://doi.org/10.36547/ams.27.3.1011","url":null,"abstract":"The phenomenon of electrochemical phase formation in metals and alloys via a supercooled liquid state stage was discussed. Assuming the electrodeposited metal to be a product of formation and ultrarapid solidification of supercooled metallic liquid, a possibility of metastable phase formation during electrodeposition of polymorphous metals was suggested. It was anticipated that the polymorphic transition of the metal’s metastable form to the stable one occurs by shear, as does the martensitic transformation. To enable revealing an orientation relationship between grains of the two phases, a method for X-ray texture analysis of metals was developed using a combination of direct pole figures. It was established that the phase formation during electrodeposition of polymorphous metals produces metastable modifications typical of entities that crystallized from a liquid state at extremely high rates. In regards polymorphic transitions in metal electrodeposition, certain orientation relationships were observed between grains of the stable and the metastable phase, which is typical of phase transformations proceeding at extremely high rates. The results obtained provided additional arguments in favor of the phenomenon under discussion.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43786241","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

Strain Hardening and Stretch Formability Behavior of Triple Phase (TP) Steel Strips 三相(TP)钢带的应变硬化和拉伸成形性能

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Acta Metallurgica Slovaca Pub Date : 2021-09-13 DOI: 10.36547/ams.27.3.1048

Maha ElMeligy, T. El-Bitar

{"title":"Strain Hardening and Stretch Formability Behavior of Triple Phase (TP) Steel Strips","authors":"Maha ElMeligy, T. El-Bitar","doi":"10.36547/ams.27.3.1048","DOIUrl":"https://doi.org/10.36547/ams.27.3.1048","url":null,"abstract":"The current work explores the strain hardening and stretches formability behaviour of the developed Triple Phase (TP) steel. Double quenched TP steel strips posse three distinguished stages of strain hardening on tensile forming. 1st stage represents the highest n-value reflecting resistance to homogeneous deformation, where steel can be safely stretched. 2nd and 3rd stage reveals lower n-values, where localized thinning exist. On Erichsen testing, the relationship between punch forming force and punch stroke exhibits two forming regions. The 1st region is delineated by a straight line showing an ultra-high strain-hardening rate, which represents a reversible elastic stretch forming. The 2nd forming region continues to a higher Erichsen punch stroke than that of the 1st region and presents the permanent plastic stretch forming behaviour. It is found that bainite and martensite clusters created, by double quenching, in TP-steel exaggerated the elastic stretch forming limit 10 times higher than the as-hot rolled condition. 7 min. holding time of strips in the salt bath is considered the most effective for the creation of a useful volume fraction of the bainite phase. However, 21 min. holding time in salt bath grows martensite laths through the bainite aggregates, affecting negatively on stretch formability.","PeriodicalId":44511,"journal":{"name":"Acta Metallurgica Slovaca","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47275704","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