Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3541
Š. Houdková, Z. Česánek, P. Šulcová, A. Keslová, K. Lencová, J. Duliškovič
The thermal spray technologies are versatile methods of deposition of thick coatings on the components surfaces. Based on spraying technology principle, various materials and coating thicknesses can be deposited. Some spraying technologies, as mobile systems, have the capability to be used directly on-site. Typically, the Twin Wire Arc Spraying systems (TWAS) are utilized to spray the large-scale constructions to protect them from corrosion. Also, one of the latest spraying technologies, Cold Spray, is nowadays being developed to serve as mobile system. Both technologies offer the possibility to spray coatings up to several millimeters thick, which makes them suitable for renovation of worn or corroded material in higher volumes. In the manuscript, the used methods and results achieved so far in the frame of National Center for Energy, are presented and compared with respect to the relationships between coatings microstructure, mechanical and functional properties. Both technologies proved its potential to deposit protective coatings, applied on conventional and nuclear power plants components.
{"title":"Potential of thermal sprayed technologies for maintenance and repair of conventional and nuclear power plants components","authors":"Š. Houdková, Z. Česánek, P. Šulcová, A. Keslová, K. Lencová, J. Duliškovič","doi":"10.37904/metal.2020.3541","DOIUrl":"https://doi.org/10.37904/metal.2020.3541","url":null,"abstract":"The thermal spray technologies are versatile methods of deposition of thick coatings on the components surfaces. Based on spraying technology principle, various materials and coating thicknesses can be deposited. Some spraying technologies, as mobile systems, have the capability to be used directly on-site. Typically, the Twin Wire Arc Spraying systems (TWAS) are utilized to spray the large-scale constructions to protect them from corrosion. Also, one of the latest spraying technologies, Cold Spray, is nowadays being developed to serve as mobile system. Both technologies offer the possibility to spray coatings up to several millimeters thick, which makes them suitable for renovation of worn or corroded material in higher volumes. In the manuscript, the used methods and results achieved so far in the frame of National Center for Energy, are presented and compared with respect to the relationships between coatings microstructure, mechanical and functional properties. Both technologies proved its potential to deposit protective coatings, applied on conventional and nuclear power plants components.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"07 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80240232","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 : 2020-01-01DOI: 10.37904/metal.2020.3660
R. Caban
One of the most commonly used methods of quality management in manufacturing and industrial enterprises is the Pareto-Lorenz analysis. This method is currently one of the most frequently used conventional tools for the improvement the product quality and processes. It is a very useful tool used in the analysis of a production or service processes that generate variables that can be categorized. The Pareto-Lorenz chart is a graphical representation of the frequency of the causes of the problem (graph in the form of a bar graph) and their cumulative values (Lorenz curve). The impact of Pareto analysis on product quality occurs mainly through the analysis of the frequency and significance of non-compliance, elimination of quality problems occurring in the enterprise most often and elimination of quality problems generating the highest costs. The purpose of the work was to analyse the quality of steel wheels manufactured by one of the companies in Poland. Steel wheels are standard equipment on cars. Their biggest advantage is durability, both mechanical and chemical. As a result of the analysis, three main causes of steel rims complaints were identified. These are edge bumps, damaged coating (splinters) and material defects. The identified causes represent a good starting point for works aimed to propose concrete preventive actions which, if implemented, should reduce the number of occurrences of certain types of defects without the need for expensive large-scale actions.
{"title":"THE USE OF THE PARETO-LORENZ DIAGRAM FOR QUAlitative ANALYSIS OF STEEL RIMS","authors":"R. Caban","doi":"10.37904/metal.2020.3660","DOIUrl":"https://doi.org/10.37904/metal.2020.3660","url":null,"abstract":"One of the most commonly used methods of quality management in manufacturing and industrial enterprises is the Pareto-Lorenz analysis. This method is currently one of the most frequently used conventional tools for the improvement the product quality and processes. It is a very useful tool used in the analysis of a production or service processes that generate variables that can be categorized. The Pareto-Lorenz chart is a graphical representation of the frequency of the causes of the problem (graph in the form of a bar graph) and their cumulative values (Lorenz curve). The impact of Pareto analysis on product quality occurs mainly through the analysis of the frequency and significance of non-compliance, elimination of quality problems occurring in the enterprise most often and elimination of quality problems generating the highest costs. The purpose of the work was to analyse the quality of steel wheels manufactured by one of the companies in Poland. Steel wheels are standard equipment on cars. Their biggest advantage is durability, both mechanical and chemical. As a result of the analysis, three main causes of steel rims complaints were identified. These are edge bumps, damaged coating (splinters) and material defects. The identified causes represent a good starting point for works aimed to propose concrete preventive actions which, if implemented, should reduce the number of occurrences of certain types of defects without the need for expensive large-scale actions.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83662647","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 : 2020-01-01DOI: 10.37904/metal.2020.3495
David Koreček, P. Solfronk, J. Sobotka
These days is still increasing emphasis put on making the production process of sheet metal stampings, which are used in the automotive, aerospace or power industries, more accurate and fast. These aspects need to be proportionately respected with respect to the economic side of these components production and in light of still increasing environmental requirements. This paper deals with the research of tested ultra-high strength steel mechanical properties under conditions of planar simple shear test (ASTM B831). The research of these properties is applied for ultra-high strength TRIP steel HCT690T EN 10346. In the experimental part was carried out plane shear tests to determine the basic mechanical properties and deformation characteristics of tested material. In the future research, measured data will serve as additional input material characteristics for numerical simulations, which can contribute to increase accuracy of computation for the given forming process.
这些天仍然越来越重视使钣金冲压件的生产过程，用于汽车，航空航天或电力工业，更加准确和快速。这些方面需要考虑到这些部件生产的经济方面，并考虑到仍在增加的环境要求。本文研究了在ASTM B831平面单剪试验条件下超高强度钢的力学性能。对超高强度TRIP钢HCT690T EN 10346的这些性能进行了研究。在试验部分进行了平面剪切试验，以确定被试材料的基本力学性能和变形特性。在未来的研究中，测量数据将作为数值模拟的额外输入材料特性，这有助于提高给定成形过程的计算精度。
{"title":"Research of TRIP Steel Mechanical Properties under Conditions of Plane Shear Stress","authors":"David Koreček, P. Solfronk, J. Sobotka","doi":"10.37904/metal.2020.3495","DOIUrl":"https://doi.org/10.37904/metal.2020.3495","url":null,"abstract":"These days is still increasing emphasis put on making the production process of sheet metal stampings, which are used in the automotive, aerospace or power industries, more accurate and fast. These aspects need to be proportionately respected with respect to the economic side of these components production and in light of still increasing environmental requirements. This paper deals with the research of tested ultra-high strength steel mechanical properties under conditions of planar simple shear test (ASTM B831). The research of these properties is applied for ultra-high strength TRIP steel HCT690T EN 10346. In the experimental part was carried out plane shear tests to determine the basic mechanical properties and deformation characteristics of tested material. In the future research, measured data will serve as additional input material characteristics for numerical simulations, which can contribute to increase accuracy of computation for the given forming process.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72942883","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 : 2020-01-01DOI: 10.37904/metal.2020.3646
Iveta Kuchtíčková, Václav Nétek, J. Drápala, T. Němec, Nikola Němcová
The article deals with the issue of technological thinking in the process of material security of supply chains of a selected group of products in the field of metallurgical secondary production. The commercial potential of this distribution, redistribution of low-carbon wire products and low-carbon materials from metallurgical secondary production, which is redistributed over long distances from the place of production to the place of consumption with the necessary requirements to control incoming materials into production and subsequent final processing. The research performed on the material of the thus redistributed selected sample showed partial differences in the deviations of the given declared values and thus an inaccurate interpretation of the accompanying data to the materials. The authors prove the fact on the given example of analysis of delivered redistribution samples.
{"title":"MATERIAL SECURITY OF LOW CARBON WIRE SUPPLY CHAINS IN THE CZECH REPUBLIC IN SELECTED FIELDS OF METALLURGICAL PRODUCTION","authors":"Iveta Kuchtíčková, Václav Nétek, J. Drápala, T. Němec, Nikola Němcová","doi":"10.37904/metal.2020.3646","DOIUrl":"https://doi.org/10.37904/metal.2020.3646","url":null,"abstract":"The article deals with the issue of technological thinking in the process of material security of supply chains of a selected group of products in the field of metallurgical secondary production. The commercial potential of this distribution, redistribution of low-carbon wire products and low-carbon materials from metallurgical secondary production, which is redistributed over long distances from the place of production to the place of consumption with the necessary requirements to control incoming materials into production and subsequent final processing. The research performed on the material of the thus redistributed selected sample showed partial differences in the deviations of the given declared values and thus an inaccurate interpretation of the accompanying data to the materials. The authors prove the fact on the given example of analysis of delivered redistribution samples.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72960941","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 : 2020-01-01DOI: 10.37904/metal.2020.3469
I. Volokitina, A. Volokitin, A. Naizabekov, S. Lezhnev, Yevgeniy Panin
In modern industry the most urgent problem is to increase the physical and mechanical properties of metal materials. One of the promising ways to improve such properties is to grind the elements of the grain structure to an ultrafine-grained (UFG) state. From all methods used to produce metal materials with ultrafine-grained structures, the most commonly severe plastic deformation (SPD) methods are used. Most of the currently existing methods of the SPD implementation have not been used in the real industrial sector due to the existing in this method of deformation of the disadvantage, which is the discreteness, i.e. the inability to process products of relatively long length and the need for a large number of processing cycles. And this determines the economic inexpediency of the introduction of this method in production. To solve these problems, technology of combined deformation “ECAP-drawing” have been developed. This work is aimed to investigation of bimetallic wire deformation during combined ECAP-drawing. Results of strain state study showed that layers of materials in the cross-section of wire have received different values of strain. Stress state of both materials is various in both deformation zones - in the ECAP matrix deformation area is divided for two sections (tension and compression) separated by diagonal. At all deformation stages the level of compressive stresses is much higher of tensile stresses.
{"title":"DEFORMATION OF BIMETALLIC WIRE DURING COMBINED ECAP-DRAWING","authors":"I. Volokitina, A. Volokitin, A. Naizabekov, S. Lezhnev, Yevgeniy Panin","doi":"10.37904/metal.2020.3469","DOIUrl":"https://doi.org/10.37904/metal.2020.3469","url":null,"abstract":"In modern industry the most urgent problem is to increase the physical and mechanical properties of metal materials. One of the promising ways to improve such properties is to grind the elements of the grain structure to an ultrafine-grained (UFG) state. From all methods used to produce metal materials with ultrafine-grained structures, the most commonly severe plastic deformation (SPD) methods are used. Most of the currently existing methods of the SPD implementation have not been used in the real industrial sector due to the existing in this method of deformation of the disadvantage, which is the discreteness, i.e. the inability to process products of relatively long length and the need for a large number of processing cycles. And this determines the economic inexpediency of the introduction of this method in production. To solve these problems, technology of combined deformation “ECAP-drawing” have been developed. This work is aimed to investigation of bimetallic wire deformation during combined ECAP-drawing. Results of strain state study showed that layers of materials in the cross-section of wire have received different values of strain. Stress state of both materials is various in both deformation zones - in the ECAP matrix deformation area is divided for two sections (tension and compression) separated by diagonal. At all deformation stages the level of compressive stresses is much higher of tensile stresses.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78338464","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 : 2020-01-01DOI: 10.37904/metal.2020.3473
K. Rubešová, M. Peković, H. Jirková, D. Hradil
Research into new forming methods has yielded new techniques of altering the microstructure in hypereutectoid steels. An innovative approach to processing can lead to improved mechanical properties thanks to elimination of problematic and undesirable sharp-edged carbides which are very difficult to dissolve. This paper explores an unconventional method of refining the grain in and removing primary sharp-edged chromium carbides from X210Cr12 hypereutectoid tool steel. The process route applied to input stock comprised semi-solid processing followed by forming below the solidus temperature. The goal of the study was to determine the impact of the applied strain on microstructural evolution and grain refinement. In these experiments, the material was heated to above the solidus temperature and then either cooled without any other intervention or cooled to a forming temperature and then formed using five to ten deformation steps. Higher number of deformation steps led to much finer microstructure and higher hardness which increased from the initial 673 HV10 to 873 HV10. This procedure produced a very fine microstructure with grains of approximately 1 µm and a fine dispersion of chromium carbides. Since the resulting material was very hard and brittle, it had to be tempered. Tempering was performed once at 300°C for 1 hour or twice at 530°C, for 1 hour in each operation.
{"title":"Grain refinement in hypereutectoid steel by semi-solid processing followed by mechanical working","authors":"K. Rubešová, M. Peković, H. Jirková, D. Hradil","doi":"10.37904/metal.2020.3473","DOIUrl":"https://doi.org/10.37904/metal.2020.3473","url":null,"abstract":"Research into new forming methods has yielded new techniques of altering the microstructure in hypereutectoid steels. An innovative approach to processing can lead to improved mechanical properties thanks to elimination of problematic and undesirable sharp-edged carbides which are very difficult to dissolve. This paper explores an unconventional method of refining the grain in and removing primary sharp-edged chromium carbides from X210Cr12 hypereutectoid tool steel. The process route applied to input stock comprised semi-solid processing followed by forming below the solidus temperature. The goal of the study was to determine the impact of the applied strain on microstructural evolution and grain refinement. In these experiments, the material was heated to above the solidus temperature and then either cooled without any other intervention or cooled to a forming temperature and then formed using five to ten deformation steps. Higher number of deformation steps led to much finer microstructure and higher hardness which increased from the initial 673 HV10 to 873 HV10. This procedure produced a very fine microstructure with grains of approximately 1 µm and a fine dispersion of chromium carbides. Since the resulting material was very hard and brittle, it had to be tempered. Tempering was performed once at 300°C for 1 hour or twice at 530°C, for 1 hour in each operation.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"1 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78495030","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 : 2020-01-01DOI: 10.37904/metal.2020.3664
Eva Donociková, R. Lenort
The resilient supplier management is a crucial part of the resilient supply chain management. The topic becomes very urgent due to the increasing number of disruptions, which appears in today’s global and turbulent business environment. The paper presents a literature review of the resilient supplier management approaches and practical experiences with their implementation in the metallurgical industry. The aim of the paper is to define the research and practice gap, i.e. identify the state of the art in that field, compare it with practice and propose the directions for further research.
{"title":"Resilient Metallurgical supplier management – research and practice gap","authors":"Eva Donociková, R. Lenort","doi":"10.37904/metal.2020.3664","DOIUrl":"https://doi.org/10.37904/metal.2020.3664","url":null,"abstract":"The resilient supplier management is a crucial part of the resilient supply chain management. The topic becomes very urgent due to the increasing number of disruptions, which appears in today’s global and turbulent business environment. The paper presents a literature review of the resilient supplier management approaches and practical experiences with their implementation in the metallurgical industry. The aim of the paper is to define the research and practice gap, i.e. identify the state of the art in that field, compare it with practice and propose the directions for further research.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91311370","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 : 2020-01-01DOI: 10.37904/metal.2020.3626
A. Stanula, W. Pilarczyk, Mark Jager, T. Wilk
The subject of this article is the failed bushing used in the car suspension. The claim of the broken bushing came from the car producer. The main aim of this paper was to know if the failure was a green crack as evidenced by steam treatment oxide on the crack interfaces. To check, these items a Scanning Electron Microscope (SEM), hardness testers, and optical microscope were used. The density of the upper edge where the crack occurred was checked. Based on this investigation it was found that the crack was not caused by the rollover application.
{"title":"The influence of technological parameters as the handling and sintering process on the structure of iron based powders","authors":"A. Stanula, W. Pilarczyk, Mark Jager, T. Wilk","doi":"10.37904/metal.2020.3626","DOIUrl":"https://doi.org/10.37904/metal.2020.3626","url":null,"abstract":"The subject of this article is the failed bushing used in the car suspension. The claim of the broken bushing came from the car producer. The main aim of this paper was to know if the failure was a green crack as evidenced by steam treatment oxide on the crack interfaces. To check, these items a Scanning Electron Microscope (SEM), hardness testers, and optical microscope were used. The density of the upper edge where the crack occurred was checked. Based on this investigation it was found that the crack was not caused by the rollover application.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90880622","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 : 2020-01-01DOI: 10.37904/metal.2020.3508
B. Rakhadilov, Z. Satbayeva, Zhuldyz Sagdoldina, R. Kozhanova
This work presents the results of plasma electrolytic hardening of steel 20Cr2Ni4A. The optimal electrolyte composition for electrolytic-plasma hardening of steels containing 20 % sodium carbonate and 20 % urea has been determined. As a result, a modified layer was obtained on the surface of steel with increased hardness and wear resistance. In this case, the basis of the material does not change, it consists of a ferritic-pearlitic structure, i.e. the part retains its viscous core, and the surface layer contains carbide particles. The presence of carbide particles in the surface layers has a positive effect on the performance properties of the parts, since small carbides keep the products from abrasion.
{"title":"INFLUENCE OF PLASMA ELECTROLYTIC HARDENING ON THE STRUCTURE AND PROPERTIES OF 20Cr2Ni4A STEEL","authors":"B. Rakhadilov, Z. Satbayeva, Zhuldyz Sagdoldina, R. Kozhanova","doi":"10.37904/metal.2020.3508","DOIUrl":"https://doi.org/10.37904/metal.2020.3508","url":null,"abstract":"This work presents the results of plasma electrolytic hardening of steel 20Cr2Ni4A. The optimal electrolyte composition for electrolytic-plasma hardening of steels containing 20 % sodium carbonate and 20 % urea has been determined. As a result, a modified layer was obtained on the surface of steel with increased hardness and wear resistance. In this case, the basis of the material does not change, it consists of a ferritic-pearlitic structure, i.e. the part retains its viscous core, and the surface layer contains carbide particles. The presence of carbide particles in the surface layers has a positive effect on the performance properties of the parts, since small carbides keep the products from abrasion.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80626459","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 : 2020-01-01DOI: 10.37904/metal.2020.3627
T. Lipiński, D. Karpisz
Hypo-eutectic silumins are used in a wide range of industrial applications, but their properties are continuously studied to improve the quality of cast products. The initial structure of AlSi9Mg alloy is composed of granular and acicular β phase, with α phase as matrix. The hard, irregular, often pointed β phase is responsible for the poor mechanical properties of said alloy. This composition is responsible for the alloy's low strength parameters, and it limits the extent of practical applications. The properties of alloys may not only depend on the chemical composition, modifiers, but may also depend on the conditions of the modification effect. Chemical elements and compounds, both added to the alloy and formed as a result of exothermic reactions, “pass” into the alloy, changing the course of its crystallization. Selection of the mixture components allows – to a degree – to decide about the starting moment of crystallization and change the range of alloy solidification or its individual phases. In the present study, the microstructure and technological properties of silumins were improved through modification with the use a chemical mixture as an exothermic modification. It was found that the exothermic modifier containing NaNO 3 NaClO 3 and TiO 2 exerted the strongest multidirectional refining effect on the studied alloys.
{"title":"EFFECT OF NaNO3, NaClO3 AND TiO2 ON MECHANICAL PROPERTIES AlSi7Mg ALLOY","authors":"T. Lipiński, D. Karpisz","doi":"10.37904/metal.2020.3627","DOIUrl":"https://doi.org/10.37904/metal.2020.3627","url":null,"abstract":"Hypo-eutectic silumins are used in a wide range of industrial applications, but their properties are continuously studied to improve the quality of cast products. The initial structure of AlSi9Mg alloy is composed of granular and acicular β phase, with α phase as matrix. The hard, irregular, often pointed β phase is responsible for the poor mechanical properties of said alloy. This composition is responsible for the alloy's low strength parameters, and it limits the extent of practical applications. The properties of alloys may not only depend on the chemical composition, modifiers, but may also depend on the conditions of the modification effect. Chemical elements and compounds, both added to the alloy and formed as a result of exothermic reactions, “pass” into the alloy, changing the course of its crystallization. Selection of the mixture components allows – to a degree – to decide about the starting moment of crystallization and change the range of alloy solidification or its individual phases. In the present study, the microstructure and technological properties of silumins were improved through modification with the use a chemical mixture as an exothermic modification. It was found that the exothermic modifier containing NaNO 3 NaClO 3 and TiO 2 exerted the strongest multidirectional refining effect on the studied alloys.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"729 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81847100","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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