Pub Date : 2022-05-04DOI: 10.1080/13640461.2022.2082758
Saeed Farahany, Mustafa Abazari
ABSTRACT The current study investigated the effect of heat treatment parameters, including solution treatment temperature (STT), time, and quench rate, on the microstructure, defects, and hardness of an Al-16Si-6Cu Shift fork die-cast alloy. The changes in primary silicon particle (PSP) features were examined quantitatively by optical microscopy, coupled with image analysis and SEM equipped with EDS. The biggest PSPs (27 ± 8 µm) and the highest area fraction (23%) were found in the sample solution treated at 470°C and cooled in the furnace. The hardness value increased in heat-treated samples slightly (140–148 BHN). A lower STT (420°C) and a lower ageing time (1 h) are suitable conditions for the heat treatment of an Al-16Si-6Cu die-cast alloy, in which a lower pore area fraction, 1.18, smaller pore, 4.5 μm, along with finer primary silicon, 9.5 ± 3 μm, with higher circularity, 0.38 ± 0.04, was achieved.
{"title":"Effect of heat treatment parameters on microstructure, defects, and properties of Al-16Si-6Cu automotive shift fork: quantitative evaluation perspective","authors":"Saeed Farahany, Mustafa Abazari","doi":"10.1080/13640461.2022.2082758","DOIUrl":"https://doi.org/10.1080/13640461.2022.2082758","url":null,"abstract":"ABSTRACT The current study investigated the effect of heat treatment parameters, including solution treatment temperature (STT), time, and quench rate, on the microstructure, defects, and hardness of an Al-16Si-6Cu Shift fork die-cast alloy. The changes in primary silicon particle (PSP) features were examined quantitatively by optical microscopy, coupled with image analysis and SEM equipped with EDS. The biggest PSPs (27 ± 8 µm) and the highest area fraction (23%) were found in the sample solution treated at 470°C and cooled in the furnace. The hardness value increased in heat-treated samples slightly (140–148 BHN). A lower STT (420°C) and a lower ageing time (1 h) are suitable conditions for the heat treatment of an Al-16Si-6Cu die-cast alloy, in which a lower pore area fraction, 1.18, smaller pore, 4.5 μm, along with finer primary silicon, 9.5 ± 3 μm, with higher circularity, 0.38 ± 0.04, was achieved.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"60 - 72"},"PeriodicalIF":1.4,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44146840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-04DOI: 10.1080/13640461.2022.2078550
F. Ramstorfer, Marco Delane de Souza
ABSTRACT The demand for long casting sequences together with a wide range of different steel grades inherently leads to the generation of incompatible steel intermixing during a grade change. This paper describes the development of an optimisation tool for casting sequences based on a mixing model. The mixing model accounts for mixing in the tundish and in the liquid core of the strand and was calibrated based on samples of the chemical composition taken from slabs containing intermixed steel. The optimisation of the casting sequence order by minimising incompatible intermixing was accomplished by applying heuristic optimisation algorithms developed for the solution of the ‘Traveling Salesman Problem’.
{"title":"Reduction of incompatible intermixing of different steel grades in continuous casting by optimizing the casting sequence","authors":"F. Ramstorfer, Marco Delane de Souza","doi":"10.1080/13640461.2022.2078550","DOIUrl":"https://doi.org/10.1080/13640461.2022.2078550","url":null,"abstract":"ABSTRACT The demand for long casting sequences together with a wide range of different steel grades inherently leads to the generation of incompatible steel intermixing during a grade change. This paper describes the development of an optimisation tool for casting sequences based on a mixing model. The mixing model accounts for mixing in the tundish and in the liquid core of the strand and was calibrated based on samples of the chemical composition taken from slabs containing intermixed steel. The optimisation of the casting sequence order by minimising incompatible intermixing was accomplished by applying heuristic optimisation algorithms developed for the solution of the ‘Traveling Salesman Problem’.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"43 - 50"},"PeriodicalIF":1.4,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47466185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-04DOI: 10.1080/13640461.2022.2069912
Murat Çolak, İ. Arslan
ABSTRACT The aim of this study is to improve the tribological behaviour of aluminium alloys by using grain refiner and modifier. The effects of Al5Ti1B grain refiner and Al10Sr modifier additives on friction and wear properties on A380, A357 alloys produced by pouring sand andpermanent mould casting were investigated. Abrasion tests were carried out under dry conditions against St1040 steel disc using a pin-disk system with 20 N load and 1.0 m/s sliding speed. It was determined that grain refiner and modifier additives decrease the friction coefficient and increase the wear resistance. It was determined that the samples produced by permanent mould casting method decreased the friction resistance by 9% and the abrasion resistance increased by 40% compared to the samples produced in sand mould. The lowest wear rate was obtained in A380 alloy with TiB and Sr added with a value of 4.87 × 10–11 m2/N.
{"title":"Investigation of the effect of the addition of grain refiner and modifier addition on wear properties in sand and permanent mould casting of A357 and A380 aluminium alloys","authors":"Murat Çolak, İ. Arslan","doi":"10.1080/13640461.2022.2069912","DOIUrl":"https://doi.org/10.1080/13640461.2022.2069912","url":null,"abstract":"ABSTRACT The aim of this study is to improve the tribological behaviour of aluminium alloys by using grain refiner and modifier. The effects of Al5Ti1B grain refiner and Al10Sr modifier additives on friction and wear properties on A380, A357 alloys produced by pouring sand andpermanent mould casting were investigated. Abrasion tests were carried out under dry conditions against St1040 steel disc using a pin-disk system with 20 N load and 1.0 m/s sliding speed. It was determined that grain refiner and modifier additives decrease the friction coefficient and increase the wear resistance. It was determined that the samples produced by permanent mould casting method decreased the friction resistance by 9% and the abrasion resistance increased by 40% compared to the samples produced in sand mould. The lowest wear rate was obtained in A380 alloy with TiB and Sr added with a value of 4.87 × 10–11 m2/N.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"17 - 23"},"PeriodicalIF":1.4,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48492388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-04DOI: 10.1080/13640461.2022.2078552
P. Tang, Jinsheng Lai, Yuying Lin
ABSTRACT In this work, OM, SEM/EDS, XRD, DSC, and tensile test were used to study the effect on mechanical and thermodynamic properties of Al-10Si-0.8Fe alloys with Al-Ti-C (0.5 wt.%) and xCe (viz. 0.2, 0.4, 0.6 and 0.8 wt.%) compound addition. After adding compound additives to Al-10Si-0.8Fe, the average size of SDAS decreased and the mechanical properties increased. When Ce is 0.6 wt.%, The smallest SDAS size and the best mechanical properties were obtained, then the melting range and enthalpy of melting also reached the minimum. Al-Ti-C can form submicron TiC in the melt, which refines the grains, and adding Ce can form Ce5Si3 to round the needle-like Fe-rich phase and reduce the adverse effect, the composite additions of them synergistically improve the properties of Al-10Si-0.8Fe alloy. But excessive Ce could aggregate Ti and Fe-rich phases, then coarse impurity particles could form in the melt, leading to modification failure and performance deterioration.
{"title":"Effect on mechanical and thermodynamic properties of Al-10Si-0.8Fe alloys with Al-Ti-C and Ce compound additions","authors":"P. Tang, Jinsheng Lai, Yuying Lin","doi":"10.1080/13640461.2022.2078552","DOIUrl":"https://doi.org/10.1080/13640461.2022.2078552","url":null,"abstract":"ABSTRACT In this work, OM, SEM/EDS, XRD, DSC, and tensile test were used to study the effect on mechanical and thermodynamic properties of Al-10Si-0.8Fe alloys with Al-Ti-C (0.5 wt.%) and xCe (viz. 0.2, 0.4, 0.6 and 0.8 wt.%) compound addition. After adding compound additives to Al-10Si-0.8Fe, the average size of SDAS decreased and the mechanical properties increased. When Ce is 0.6 wt.%, The smallest SDAS size and the best mechanical properties were obtained, then the melting range and enthalpy of melting also reached the minimum. Al-Ti-C can form submicron TiC in the melt, which refines the grains, and adding Ce can form Ce5Si3 to round the needle-like Fe-rich phase and reduce the adverse effect, the composite additions of them synergistically improve the properties of Al-10Si-0.8Fe alloy. But excessive Ce could aggregate Ti and Fe-rich phases, then coarse impurity particles could form in the melt, leading to modification failure and performance deterioration.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"33 - 42"},"PeriodicalIF":1.4,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45020830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-04DOI: 10.1080/13640461.2022.2078551
S. A, Y. Basavaraj, R. Subramanya
ABSTRACT The aim of this study is to investigate at the mechanical characteristics of Fe3O4 particle reinforced with 7075 aluminium alloy composite. The composites of different weight percentage 2%, 4%, 6%, and 8% of Fe3O4 reinforcement were prepared using stir casting technique. Prepared composite samples were examined for mechanical properties like tensile percentage elongation and hardness test along with scanning electron microscopy. Additionally, corrosion was also conducted on the prepared samples. The results of mechanical properties reveal that improvement in hardness and tensile strength and corrosion resistance values with different weight percentage combinations. When compared to the original Al7075 alloy, the Ultimate Tensile Strength is highest at a value of 64.563% for 8% Fe3O4 reinforcement, and variation in Ultimate Tensile Strength is highest at a value of 21.865% for an increase in reinforcement percentage from 4% to 6% weight, according to the experimental studies. .
{"title":"Synthesis of Fe3O4–aluminium matrix composites: mechanical and corrosion characteristics","authors":"S. A, Y. Basavaraj, R. Subramanya","doi":"10.1080/13640461.2022.2078551","DOIUrl":"https://doi.org/10.1080/13640461.2022.2078551","url":null,"abstract":"ABSTRACT The aim of this study is to investigate at the mechanical characteristics of Fe3O4 particle reinforced with 7075 aluminium alloy composite. The composites of different weight percentage 2%, 4%, 6%, and 8% of Fe3O4 reinforcement were prepared using stir casting technique. Prepared composite samples were examined for mechanical properties like tensile percentage elongation and hardness test along with scanning electron microscopy. Additionally, corrosion was also conducted on the prepared samples. The results of mechanical properties reveal that improvement in hardness and tensile strength and corrosion resistance values with different weight percentage combinations. When compared to the original Al7075 alloy, the Ultimate Tensile Strength is highest at a value of 64.563% for 8% Fe3O4 reinforcement, and variation in Ultimate Tensile Strength is highest at a value of 21.865% for an increase in reinforcement percentage from 4% to 6% weight, according to the experimental studies. .","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"51 - 59"},"PeriodicalIF":1.4,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44443801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-02DOI: 10.1080/13640461.2022.2069913
K. Asano, Ryuta Toyoda, M. Matsumuro, Akinori Okada
ABSTRACT For reducing the forming cost of the PAN-based carbon fibre preforms, a water glass binder was used as a substitute for conventional silica binder. The preforms were infiltrated with an aluminium alloy melt by squeeze casting to fabricate the fibre-reinforced composites. The microstructure and properties of the composites were compared to the composites using the silica binder. In the composites, the water glass binder mainly remained in the vicinity of the fibre–aluminium interface and partially distributed in the matrix. The reaction near the interface between the alloy melt and binder was not recognised. The thermal expansion coefficient, thermal conductivity and the compressive strength of the composites using the water glass binder were approximately equivalent to those of the composite using the silica binder. Based on these results, the water glass can be used as an alternative binder to the silica sol.
{"title":"Fabrication of carbon fibre preform with water-glass binder and infiltration of aluminium alloy melt by squeeze casting","authors":"K. Asano, Ryuta Toyoda, M. Matsumuro, Akinori Okada","doi":"10.1080/13640461.2022.2069913","DOIUrl":"https://doi.org/10.1080/13640461.2022.2069913","url":null,"abstract":"ABSTRACT For reducing the forming cost of the PAN-based carbon fibre preforms, a water glass binder was used as a substitute for conventional silica binder. The preforms were infiltrated with an aluminium alloy melt by squeeze casting to fabricate the fibre-reinforced composites. The microstructure and properties of the composites were compared to the composites using the silica binder. In the composites, the water glass binder mainly remained in the vicinity of the fibre–aluminium interface and partially distributed in the matrix. The reaction near the interface between the alloy melt and binder was not recognised. The thermal expansion coefficient, thermal conductivity and the compressive strength of the composites using the water glass binder were approximately equivalent to those of the composite using the silica binder. Based on these results, the water glass can be used as an alternative binder to the silica sol.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"24 - 32"},"PeriodicalIF":1.4,"publicationDate":"2022-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43255601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-18DOI: 10.1080/13640461.2022.2064653
Murat Çolak, Mete Şekerden
ABSTRACT In the casting method, it is crucial to properly make the moulding design to produce sound parts. Volumetric change, especially during the solidification of spheroidal graphite cast irons, may show different behaviour compared to steel and aluminium castings. In this study, castings were carried out with single and double feeders with varying casting parameters of green sand and resin mould sand containing different cross-sectional thicknesses. Depending on the chemical composition, mould rigidity and inoculation efficiency, and the importance of the feeder path was evaluated by experimental and modelling techniques. Consequently, it was observed that the risk of shrinkage in resin moulds is less than in green sand castings in the same moulding design. In addition, it has been found that the number of feeders and neck connection is an important parameter in pore formation.
{"title":"MODELLING AND VALIDATION OF EFFECT OF BINDER TYPE ON FEEDING BEHAVIOUR OF SPHEROIDAL GRAPHITE CAST IRON","authors":"Murat Çolak, Mete Şekerden","doi":"10.1080/13640461.2022.2064653","DOIUrl":"https://doi.org/10.1080/13640461.2022.2064653","url":null,"abstract":"ABSTRACT In the casting method, it is crucial to properly make the moulding design to produce sound parts. Volumetric change, especially during the solidification of spheroidal graphite cast irons, may show different behaviour compared to steel and aluminium castings. In this study, castings were carried out with single and double feeders with varying casting parameters of green sand and resin mould sand containing different cross-sectional thicknesses. Depending on the chemical composition, mould rigidity and inoculation efficiency, and the importance of the feeder path was evaluated by experimental and modelling techniques. Consequently, it was observed that the risk of shrinkage in resin moulds is less than in green sand castings in the same moulding design. In addition, it has been found that the number of feeders and neck connection is an important parameter in pore formation.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"9 - 16"},"PeriodicalIF":1.4,"publicationDate":"2022-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42877868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-16DOI: 10.1080/13640461.2022.2036415
Syeda Talat Arshad, A. Shah, Aqueel Shah
ABSTRACT Phenolic resins are in-organic polymers with properties that make them high-strength binders with great potential for modification. The base-catalyzed phenol-formaldehyde resins provide the desired hardness to the core avoiding sand slipping on the surface. A modified resol type phenolic resin is developed for this study with minimum ingredients to compare it with existing recipes in the literature. A batch of cores was prepared with the standard 1-inch cross-section briquettes (dog-bone) with modified resol and cured through hot-curing process. Hardness and ultimate tensile strength values of these cores were compared with previous data present in literature. The average hardness as well the tensile strength from modified resol was higher than the cores from previous hot coating resol recipes and the gas-set cores present in the literature. Furthermore, the surface roughness of the cores was examined through Atomic Force Microscopy (AFM), and the ten-point height (Rz) value was lower than existing recipes.
{"title":"Study on the feasibility of alternatives for phenolic resins used in sand casting","authors":"Syeda Talat Arshad, A. Shah, Aqueel Shah","doi":"10.1080/13640461.2022.2036415","DOIUrl":"https://doi.org/10.1080/13640461.2022.2036415","url":null,"abstract":"ABSTRACT Phenolic resins are in-organic polymers with properties that make them high-strength binders with great potential for modification. The base-catalyzed phenol-formaldehyde resins provide the desired hardness to the core avoiding sand slipping on the surface. A modified resol type phenolic resin is developed for this study with minimum ingredients to compare it with existing recipes in the literature. A batch of cores was prepared with the standard 1-inch cross-section briquettes (dog-bone) with modified resol and cured through hot-curing process. Hardness and ultimate tensile strength values of these cores were compared with previous data present in literature. The average hardness as well the tensile strength from modified resol was higher than the cores from previous hot coating resol recipes and the gas-set cores present in the literature. Furthermore, the surface roughness of the cores was examined through Atomic Force Microscopy (AFM), and the ten-point height (Rz) value was lower than existing recipes.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"1 - 8"},"PeriodicalIF":1.4,"publicationDate":"2022-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41466253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-02DOI: 10.1080/13640461.2021.2011655
Xiaogang Yang, L. Xie, Chao-bin Lai, Diqiang Luo
ABSTRACT In the current article, the influence of titanium on the hot ductility of peritectic-microalloyed steels, in the temperature range 600°C to 950°C, was investigated by tensile testing. The morphology of the fracture and the behaviour of precipitates, inclusions and microstructures near the fracture surface were observed and discussed. It was found that within the test temperature range, the reduction in area values of titanium-bearing steels were almost greater than 40%, which were much larger than those of titanium-free steels. This improvement was due to the formation of (TixNb1-x)(CyN1-y) precipitates and titanium-aluminium oxides with high titanium content that could act as the nucleation sites for dimples to promote the occurrence of ductile fracture. In addition, the austenite grain was refined and more uniform in size. The thickness together with the maintain temperature range of the ferrite films which distribute only along austenite grain boundaries were reduced.
{"title":"Study on the mechanism of titanium improving the hot ductility of peritectic microalloyed steels in brittle zone III","authors":"Xiaogang Yang, L. Xie, Chao-bin Lai, Diqiang Luo","doi":"10.1080/13640461.2021.2011655","DOIUrl":"https://doi.org/10.1080/13640461.2021.2011655","url":null,"abstract":"ABSTRACT In the current article, the influence of titanium on the hot ductility of peritectic-microalloyed steels, in the temperature range 600°C to 950°C, was investigated by tensile testing. The morphology of the fracture and the behaviour of precipitates, inclusions and microstructures near the fracture surface were observed and discussed. It was found that within the test temperature range, the reduction in area values of titanium-bearing steels were almost greater than 40%, which were much larger than those of titanium-free steels. This improvement was due to the formation of (TixNb1-x)(CyN1-y) precipitates and titanium-aluminium oxides with high titanium content that could act as the nucleation sites for dimples to promote the occurrence of ductile fracture. In addition, the austenite grain was refined and more uniform in size. The thickness together with the maintain temperature range of the ferrite films which distribute only along austenite grain boundaries were reduced.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"34 1","pages":"151 - 161"},"PeriodicalIF":1.4,"publicationDate":"2021-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46104013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-02DOI: 10.1080/13640461.2021.2015889
N. A. Kidalov, A. S. Adamova, N. V. Grigoreva
ABSTRACT In the foundry for the production of moulds and cores, mixtures based on water glass are widely used. During their hardening, the coagulation of liquid glass occurs, as a result of which the mixture obtains high strength characteristic. A significant drawback of moulding mixtures based on water glass is low knockout due to increased sintering ability of water glass with moulding sand. To improve knockout, weak additives are introduced into the composition of moulding mixtures. This paper analyses the characteristics of organic weak additives for the composition of moulding mixtures based on water glass. It is shown that the main indicators which affecting to the knockout of mixtures are the amount of evolved gases and the forming carbon formation. With an increase in coefficient of thermal destruction, the knockout of the mixtures based on water glass mixture is reduced by increasing the amount of formed carbon.
{"title":"Selection of technological additives to the composition of the moulding mixtures based on water glass","authors":"N. A. Kidalov, A. S. Adamova, N. V. Grigoreva","doi":"10.1080/13640461.2021.2015889","DOIUrl":"https://doi.org/10.1080/13640461.2021.2015889","url":null,"abstract":"ABSTRACT In the foundry for the production of moulds and cores, mixtures based on water glass are widely used. During their hardening, the coagulation of liquid glass occurs, as a result of which the mixture obtains high strength characteristic. A significant drawback of moulding mixtures based on water glass is low knockout due to increased sintering ability of water glass with moulding sand. To improve knockout, weak additives are introduced into the composition of moulding mixtures. This paper analyses the characteristics of organic weak additives for the composition of moulding mixtures based on water glass. It is shown that the main indicators which affecting to the knockout of mixtures are the amount of evolved gases and the forming carbon formation. With an increase in coefficient of thermal destruction, the knockout of the mixtures based on water glass mixture is reduced by increasing the amount of formed carbon.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":" 2","pages":"162 - 168"},"PeriodicalIF":1.4,"publicationDate":"2021-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41254660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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