Pub Date : 2021-03-04DOI: 10.1080/13640461.2021.1917890
D. Sundaram, József Tamás Svidró, A. Diószegi, Judit Svidró
ABSTRACT Gas permeability of moulds and cores is an important factor to consider in the casting process. In foundries, gas permeability is measured by using instruments which give dimensionless numbers. This approach enables the comparison of values between samples and is often not quantified in units. In this study, a custom-made measurement system is introduced that applies Darcy’s law, where pressure gradients for different flow rates are studied. The Darcian permeability in standard cylindrical samples was determined using a method that is familiar with those in earth sciences. Two types, steady-state and unsteady-state approaches were used for the calculations, and the difference in permeability values generated by these two methods is discussed. The results of a silica sand sample with furan resin and a 3D-printed sample that consists of artificial granulous material with phenolic resin were compared.
{"title":"Measurement of Darcian Permeability of foundry sand mixtures","authors":"D. Sundaram, József Tamás Svidró, A. Diószegi, Judit Svidró","doi":"10.1080/13640461.2021.1917890","DOIUrl":"https://doi.org/10.1080/13640461.2021.1917890","url":null,"abstract":"ABSTRACT Gas permeability of moulds and cores is an important factor to consider in the casting process. In foundries, gas permeability is measured by using instruments which give dimensionless numbers. This approach enables the comparison of values between samples and is often not quantified in units. In this study, a custom-made measurement system is introduced that applies Darcy’s law, where pressure gradients for different flow rates are studied. The Darcian permeability in standard cylindrical samples was determined using a method that is familiar with those in earth sciences. Two types, steady-state and unsteady-state approaches were used for the calculations, and the difference in permeability values generated by these two methods is discussed. The results of a silica sand sample with furan resin and a 3D-printed sample that consists of artificial granulous material with phenolic resin were compared.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1917890","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44671756","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 : 2021-03-04DOI: 10.1080/13640461.2021.1904673
Huaichao Wu, Xuanping Yang, Gang Cao, Limei Zhao, Lv Yang
ABSTRACT In this study, HPDC is introduced into the production of oil circuit board, aiming to solve forming defects and provide a complete design concept for the exploitation of die-casting process in large castings. First, the die-casting die was designed and its rationality was verified, but the unreasonable selection of injection process parameters caused casting non-conformance. Next, the experimental data of L25 orthogonal array of Taguchi method were used as training samples and the porosity of the die-cast part was examined in relation to casting variable parameters. Specifically, the velocity, temperature and injection pressure were mainly investigated, while the mathematical model passed the test of accuracy. Finally, Particle Swarm Optimisation (PSO) algorithm was used to optimise the model, achieving minimum porosity. The results have shown that the PSO algorithm optimisation results are better than the one produced by the Taguchi method, providing a significant improvement over the pre-optimisation results.
{"title":"Design and optimisation of die casting process for heavy-duty automatic transmission oil circuit board","authors":"Huaichao Wu, Xuanping Yang, Gang Cao, Limei Zhao, Lv Yang","doi":"10.1080/13640461.2021.1904673","DOIUrl":"https://doi.org/10.1080/13640461.2021.1904673","url":null,"abstract":"ABSTRACT In this study, HPDC is introduced into the production of oil circuit board, aiming to solve forming defects and provide a complete design concept for the exploitation of die-casting process in large castings. First, the die-casting die was designed and its rationality was verified, but the unreasonable selection of injection process parameters caused casting non-conformance. Next, the experimental data of L25 orthogonal array of Taguchi method were used as training samples and the porosity of the die-cast part was examined in relation to casting variable parameters. Specifically, the velocity, temperature and injection pressure were mainly investigated, while the mathematical model passed the test of accuracy. Finally, Particle Swarm Optimisation (PSO) algorithm was used to optimise the model, achieving minimum porosity. The results have shown that the PSO algorithm optimisation results are better than the one produced by the Taguchi method, providing a significant improvement over the pre-optimisation results.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1904673","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44730250","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 : 2021-03-04DOI: 10.1080/13640461.2021.1898150
Bingxu Wang, Yuming Pan, G. Barber, Rui Wang
ABSTRACT In this research, the effects of laser surface hardening treatment on the phase transformation of austempered and quench-tempered grey cast irons were investigated. It was found that there were four zones in the matrix of austempered grey cast iron and three zones in the matrix of quench-tempered grey cast iron produced by the laser hardening process. Both cast irons had central laser-hardened zones containing ledeburite (Zone 1) and heat-affected zones (Zone 2) containing martensite. For austempering, an additional heat-affected zone (Zone 3) consisting of tempered ausferrite and a substrate (Zone 4) consisting of ausferrite was formed in the matrix, the dimensions of the laser-hardened and heat-affected regions were independent of the austempering and tempering temperatures. The results reported in this work could be used as a valuable reference for future research on laser-hardened grey cast iron applications. For quench tempering, the substrate (Zone 4) consisted of tempered martensite. Additionally
{"title":"Phase transformation of austempered and quench-tempered gray cast irons under laser surface hardening treatment","authors":"Bingxu Wang, Yuming Pan, G. Barber, Rui Wang","doi":"10.1080/13640461.2021.1898150","DOIUrl":"https://doi.org/10.1080/13640461.2021.1898150","url":null,"abstract":"ABSTRACT In this research, the effects of laser surface hardening treatment on the phase transformation of austempered and quench-tempered grey cast irons were investigated. It was found that there were four zones in the matrix of austempered grey cast iron and three zones in the matrix of quench-tempered grey cast iron produced by the laser hardening process. Both cast irons had central laser-hardened zones containing ledeburite (Zone 1) and heat-affected zones (Zone 2) containing martensite. For austempering, an additional heat-affected zone (Zone 3) consisting of tempered ausferrite and a substrate (Zone 4) consisting of ausferrite was formed in the matrix, the dimensions of the laser-hardened and heat-affected regions were independent of the austempering and tempering temperatures. The results reported in this work could be used as a valuable reference for future research on laser-hardened grey cast iron applications. For quench tempering, the substrate (Zone 4) consisted of tempered martensite. Additionally","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1898150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48571300","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 : 2021-03-04DOI: 10.1080/13640461.2021.1905329
G. Peng, Y. Gu, X. Fu, G. Song, S.Y. Chen
ABSTRACT First-principles calculation was carried out to investigate the mechanism of Zr poisoning Al-5Ti-B grain refiners via Ti (or Zr)-adsorbed TiB2 models. The results show that the most energetically favourable sites for both adsorptions of Zr and Ti are bridge- and hollow-sites. The calculated results show that (i) adsorption energy of Ti is slightly more negative than that of Zr; (ii) The adsorption distance of Ti with the interface is shorter than that of Zr; (iii) the number of electric charges acquisition of adsorbed Ti is about twice larger than that of Zr; and (iv) the mixed metallic/covalent bonding on the Ti adsorbed interface is stronger than that on the Zr adsorbed interface. All results exhibit Ti atom is stronger than Zr in the adsorption ability. When both Zr and Ti atom co-exist, the adsorption of Zr on TiB2 weakens the adsorption of Ti. Co-adsorption of Ti and Zr exhibits an atomically roughening interface of TiB2. First-principles calculation of Ti and Zr adsorption on TiB2 well explains the mechanism of Zr poisoning Al-5Ti-B grain refiners in thermodynamic in view of the co-adsorption of Zr and Ti deteriorating the nucleating potency of TiB2 for α-Al.
{"title":"Mechanism of Zr poisoning Al-5Ti-B grain refiners based on the first-principles calculation","authors":"G. Peng, Y. Gu, X. Fu, G. Song, S.Y. Chen","doi":"10.1080/13640461.2021.1905329","DOIUrl":"https://doi.org/10.1080/13640461.2021.1905329","url":null,"abstract":"ABSTRACT First-principles calculation was carried out to investigate the mechanism of Zr poisoning Al-5Ti-B grain refiners via Ti (or Zr)-adsorbed TiB2 models. The results show that the most energetically favourable sites for both adsorptions of Zr and Ti are bridge- and hollow-sites. The calculated results show that (i) adsorption energy of Ti is slightly more negative than that of Zr; (ii) The adsorption distance of Ti with the interface is shorter than that of Zr; (iii) the number of electric charges acquisition of adsorbed Ti is about twice larger than that of Zr; and (iv) the mixed metallic/covalent bonding on the Ti adsorbed interface is stronger than that on the Zr adsorbed interface. All results exhibit Ti atom is stronger than Zr in the adsorption ability. When both Zr and Ti atom co-exist, the adsorption of Zr on TiB2 weakens the adsorption of Ti. Co-adsorption of Ti and Zr exhibits an atomically roughening interface of TiB2. First-principles calculation of Ti and Zr adsorption on TiB2 well explains the mechanism of Zr poisoning Al-5Ti-B grain refiners in thermodynamic in view of the co-adsorption of Zr and Ti deteriorating the nucleating potency of TiB2 for α-Al.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1905329","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48390904","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 : 2021-03-04DOI: 10.1080/13640461.2021.1936381
M. Kul, B. Akgul, K. O. Oskay, A. E. Alsan, B. Karaca
ABSTRACT In the cast iron industry, mould sand quality and the most efficient recovery of used sand into the system are critical. For this purpose, the optimum values of the factors (humidity, active bentonite and coal dust) affecting the green strength, gas permeability and shear strength of the mould sand were determined in this study. The optimum mixture ratio, which makes the green strength, gas permeability and shear strength of the mould sand the best, was made by using the mixture design method. As a result of the studies, optimum casting sand composition; the percentage of moisture content, the percentage of coal dust, the percentage of active bentonite and the percentage of recycle sand were determined as 3.92%, 0.05%, 0.30% and 95.73%, respectively. The green compression strength(B1) 23.5 N/cm2, shear strength(B2) 7.7 N/cm2 and gas permeability (B3) 91 mmWS of the conventional cast sand prepared in this optimum composition were measured.
{"title":"Optimisation of recycled moulding sand composition using the mixture design method","authors":"M. Kul, B. Akgul, K. O. Oskay, A. E. Alsan, B. Karaca","doi":"10.1080/13640461.2021.1936381","DOIUrl":"https://doi.org/10.1080/13640461.2021.1936381","url":null,"abstract":"ABSTRACT In the cast iron industry, mould sand quality and the most efficient recovery of used sand into the system are critical. For this purpose, the optimum values of the factors (humidity, active bentonite and coal dust) affecting the green strength, gas permeability and shear strength of the mould sand were determined in this study. The optimum mixture ratio, which makes the green strength, gas permeability and shear strength of the mould sand the best, was made by using the mixture design method. As a result of the studies, optimum casting sand composition; the percentage of moisture content, the percentage of coal dust, the percentage of active bentonite and the percentage of recycle sand were determined as 3.92%, 0.05%, 0.30% and 95.73%, respectively. The green compression strength(B1) 23.5 N/cm2, shear strength(B2) 7.7 N/cm2 and gas permeability (B3) 91 mmWS of the conventional cast sand prepared in this optimum composition were measured.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1936381","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47199475","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 : 2021-02-25DOI: 10.1080/13640461.2021.1889163
K. Pratheesh, M. Ravi, M. George
ABSTRACT Nowadays, Squeeze casting is considered as a convenient process for developing quality piston components. In this paper, casting methods such as squeeze casting and die casting techniques are used for compare the tensile behavior of Al-Si piston in the view of casted and heat-treated aspects. K-Nearest Neighbour (KNN) algorithm is used for predicting the tensile fracture of the squeeze casted Al-Si alloy. The proposed method is implemented in the MATLAB platform, and the tensile fracture in casting is compared with the experimental and predicted value. The scanning electron microscope analyzes the microstructural property and fractures analysis of the material. The maximum ultimate tensile strength of the casted and heat-treated specimen is 184 MPa and 297 MPa. The results indicate the proposed approach is an efficient method than the implemented Artificial neural network for predicting the tensile fracture in Aluminium-Silicon alloy materials.
{"title":"Characterisation of tensile fracture in squeeze casted Al–Si piston alloy","authors":"K. Pratheesh, M. Ravi, M. George","doi":"10.1080/13640461.2021.1889163","DOIUrl":"https://doi.org/10.1080/13640461.2021.1889163","url":null,"abstract":"ABSTRACT Nowadays, Squeeze casting is considered as a convenient process for developing quality piston components. In this paper, casting methods such as squeeze casting and die casting techniques are used for compare the tensile behavior of Al-Si piston in the view of casted and heat-treated aspects. K-Nearest Neighbour (KNN) algorithm is used for predicting the tensile fracture of the squeeze casted Al-Si alloy. The proposed method is implemented in the MATLAB platform, and the tensile fracture in casting is compared with the experimental and predicted value. The scanning electron microscope analyzes the microstructural property and fractures analysis of the material. The maximum ultimate tensile strength of the casted and heat-treated specimen is 184 MPa and 297 MPa. The results indicate the proposed approach is an efficient method than the implemented Artificial neural network for predicting the tensile fracture in Aluminium-Silicon alloy materials.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1889163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41420940","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 : 2021-01-02DOI: 10.1080/13640461.2021.1877943
S. Dwivedi, Ambuj Saxena, Shubham Sharma, A. Srivastava, N. Maurya
ABSTRACT In the present study, an attempt has been made to utilise spent alumina catalyst (SAC) and carbonised eggshell (CAES) in the fabrication of AA5052-based composite material. Cr was also added to further enhance the tensile strength, hardness and corrosion resistance of the material. Results showed that by adding 4.5% SAC, 4.5% CAES and 1.5% Cr in aluminium alloy, mechanical properties such as tensile strength, hardness and compressive strength enhanced significantly. Tensile strength, hardness and compressive strength increased by about 11.98%, 37.22% and 23.06%, respectively, concerning the base material. However, the toughness and ductility of composite have been reduced. Microstructure results of Al/4.5% SAC/4.5% CAES/1.5% Cr composite showed uniform. Corrosion weight loss and thermal expansion behaviour of composite have been also investigated to observe the SAC, CAES and Cr addition effect in the aluminium alloy.
{"title":"Influence of SAC and eggshell addition in the physical, mechanical and thermal behaviour of Cr reinforced aluminium based composite","authors":"S. Dwivedi, Ambuj Saxena, Shubham Sharma, A. Srivastava, N. Maurya","doi":"10.1080/13640461.2021.1877943","DOIUrl":"https://doi.org/10.1080/13640461.2021.1877943","url":null,"abstract":"ABSTRACT In the present study, an attempt has been made to utilise spent alumina catalyst (SAC) and carbonised eggshell (CAES) in the fabrication of AA5052-based composite material. Cr was also added to further enhance the tensile strength, hardness and corrosion resistance of the material. Results showed that by adding 4.5% SAC, 4.5% CAES and 1.5% Cr in aluminium alloy, mechanical properties such as tensile strength, hardness and compressive strength enhanced significantly. Tensile strength, hardness and compressive strength increased by about 11.98%, 37.22% and 23.06%, respectively, concerning the base material. However, the toughness and ductility of composite have been reduced. Microstructure results of Al/4.5% SAC/4.5% CAES/1.5% Cr composite showed uniform. Corrosion weight loss and thermal expansion behaviour of composite have been also investigated to observe the SAC, CAES and Cr addition effect in the aluminium alloy.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2021.1877943","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48216161","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 : 2021-01-02DOI: 10.1080/13640461.2020.1863538
Xiao-Hui Chen, Guiwu Liu, Ping Chen, Lei Liu, Senlin Rao, Yong Hu
ABSTRACT The composite components with complex-shape and containing different nanoparticle contents and sizes were successfully produced by the short-process thixoforming. Based on the developed constitutive model, numerical simulation of thixoforming for the composites with a high solid fraction was carried out, and the relevant experiments were performed. The influences of temperature and forming rate on strain-stress were analysed. Furthermore, the effects of temperature, moving rate of the die and holding time on the filling behaviour were discussed. Results of numerical simulation revealed that at high temperature and high forming rate, uniformly distributed stress-strain field and reduced maximum forming force could be obtained, which is advantageous for avoiding the non-uniform composition and incomplete filling caused by liquid-phase segregation; they were consistent with experimental results. After T6 heat treatment, the average yield strength and ultimate tensile strength of the parts were significantly improved. Moreover, the fracture mechanism of the part was discussed.
{"title":"Short-process thixoforming of nano-particles reinforced aluminium matrix composites with a high solid fraction","authors":"Xiao-Hui Chen, Guiwu Liu, Ping Chen, Lei Liu, Senlin Rao, Yong Hu","doi":"10.1080/13640461.2020.1863538","DOIUrl":"https://doi.org/10.1080/13640461.2020.1863538","url":null,"abstract":"ABSTRACT The composite components with complex-shape and containing different nanoparticle contents and sizes were successfully produced by the short-process thixoforming. Based on the developed constitutive model, numerical simulation of thixoforming for the composites with a high solid fraction was carried out, and the relevant experiments were performed. The influences of temperature and forming rate on strain-stress were analysed. Furthermore, the effects of temperature, moving rate of the die and holding time on the filling behaviour were discussed. Results of numerical simulation revealed that at high temperature and high forming rate, uniformly distributed stress-strain field and reduced maximum forming force could be obtained, which is advantageous for avoiding the non-uniform composition and incomplete filling caused by liquid-phase segregation; they were consistent with experimental results. After T6 heat treatment, the average yield strength and ultimate tensile strength of the parts were significantly improved. Moreover, the fracture mechanism of the part was discussed.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1863538","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47153570","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 : 2020-12-29DOI: 10.1080/13640461.2020.1868147
Suo Fan, He-bao Wu
ABSTRACT The effect of pouring temperature on microstructure and bonding properties of the Mg/aluminised steel bimetallic castings prepared by the solid–liquid compound casting process was investigated in this paper in order to improve the interface bonding of the Mg/aluminised steel bimetallic castings. The results show that the Mg/aluminised steel bimetallic castings produced with different pouring temperatures obtained a uniform interface layer that was mainly composed of the Fe2Al5, τ10-Al9Fe4Si3, FeAl3 and Al12Mg17 phases. When the pouring temperature was low, the cracks were formed between the Mg and the interface layer. With increasing pouring temperature, a compact interface bonding was achieved. The bonding properties of the Mg/aluminised steel bimetallic castings increased with increasing pouring temperature. An optimised bonding of the Mg/aluminised steel bimetallic castings was obtained with a pouring temperature of 780°C.
{"title":"Improved interface bonding of Mg/aluminized steel bimetallic castings prepared by solid–liquid compound casting process","authors":"Suo Fan, He-bao Wu","doi":"10.1080/13640461.2020.1868147","DOIUrl":"https://doi.org/10.1080/13640461.2020.1868147","url":null,"abstract":"ABSTRACT The effect of pouring temperature on microstructure and bonding properties of the Mg/aluminised steel bimetallic castings prepared by the solid–liquid compound casting process was investigated in this paper in order to improve the interface bonding of the Mg/aluminised steel bimetallic castings. The results show that the Mg/aluminised steel bimetallic castings produced with different pouring temperatures obtained a uniform interface layer that was mainly composed of the Fe2Al5, τ10-Al9Fe4Si3, FeAl3 and Al12Mg17 phases. When the pouring temperature was low, the cracks were formed between the Mg and the interface layer. With increasing pouring temperature, a compact interface bonding was achieved. The bonding properties of the Mg/aluminised steel bimetallic castings increased with increasing pouring temperature. An optimised bonding of the Mg/aluminised steel bimetallic castings was obtained with a pouring temperature of 780°C.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1868147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43204035","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 : 2020-12-23DOI: 10.1080/13640461.2020.1864928
M. Malekan, A. Bahmani
ABSTRACT Dendrite coherency or dendrite impingement is an important factor for determining solidification microstructure and casting defects of alloys. In this research, the effect of various cooling rates and Al-5Ti-1B grain refiner contents on the dendrite coherency point (DCP) characteristics of an Al-Si-Mg alloy designated as A357 has been studied. The results showed that both mentioned parameters have a significant influence on DCP of this alloy. Increasing the cooling rate from 0.15 to 1.0 °C/s and the grain refiner content from 0.0 to 3 wt. % increased the solid fraction in where dendrite coherency occurs. Moreover, enhancement of the cooling rate and grain refiner could increase the difference between the liquidus and coherency temperatures (TN–TDCP), about 27 and 26 °C, respectively. The dendrite coherency time decreased by increasing the cooling rate and increased by increasing the grain refiner content.
{"title":"Determination of dendrite coherency point characteristics in Al-Si-Mg alloy","authors":"M. Malekan, A. Bahmani","doi":"10.1080/13640461.2020.1864928","DOIUrl":"https://doi.org/10.1080/13640461.2020.1864928","url":null,"abstract":"ABSTRACT Dendrite coherency or dendrite impingement is an important factor for determining solidification microstructure and casting defects of alloys. In this research, the effect of various cooling rates and Al-5Ti-1B grain refiner contents on the dendrite coherency point (DCP) characteristics of an Al-Si-Mg alloy designated as A357 has been studied. The results showed that both mentioned parameters have a significant influence on DCP of this alloy. Increasing the cooling rate from 0.15 to 1.0 °C/s and the grain refiner content from 0.0 to 3 wt. % increased the solid fraction in where dendrite coherency occurs. Moreover, enhancement of the cooling rate and grain refiner could increase the difference between the liquidus and coherency temperatures (TN–TDCP), about 27 and 26 °C, respectively. The dendrite coherency time decreased by increasing the cooling rate and increased by increasing the grain refiner content.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1864928","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44700013","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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