Pub Date : 2020-08-06DOI: 10.1080/13640461.2020.1804168
Guixin Dai, Shi-ping Wu, Wei Chen, Xixi Huang
ABSTRACT The effect of P/S-wave on the solidification feeding and the mechanism of vibration promoting the solidification feeding in the low-pressure casting are discussed in the paper. The casting defects were analysed by X-ray non-destructive testing and the buoyancy method. It can be found that the compactness of casting is greatly improved by vibration. In the solidification feeding, according to vibration theory, P-wave will play a decisive role. When the transmission direction of P-wave is perpendicular to the feeding direction, it will lead to the alternation of dense-sparse state in the solidification system. When feeding is blocked, in the sparse state, the diameter of the feeding channel will increase, so that the pressure loss of feeding decreases. At the feeding end, the feeding pressure will make the solidification feeding again. On the contrary, vibration can’t further promote the feeding in the dense state.
{"title":"Mechanism of P-wave promoting the solidification feeding in the low-pressure casting of ZL205A alloy","authors":"Guixin Dai, Shi-ping Wu, Wei Chen, Xixi Huang","doi":"10.1080/13640461.2020.1804168","DOIUrl":"https://doi.org/10.1080/13640461.2020.1804168","url":null,"abstract":"ABSTRACT The effect of P/S-wave on the solidification feeding and the mechanism of vibration promoting the solidification feeding in the low-pressure casting are discussed in the paper. The casting defects were analysed by X-ray non-destructive testing and the buoyancy method. It can be found that the compactness of casting is greatly improved by vibration. In the solidification feeding, according to vibration theory, P-wave will play a decisive role. When the transmission direction of P-wave is perpendicular to the feeding direction, it will lead to the alternation of dense-sparse state in the solidification system. When feeding is blocked, in the sparse state, the diameter of the feeding channel will increase, so that the pressure loss of feeding decreases. At the feeding end, the feeding pressure will make the solidification feeding again. On the contrary, vibration can’t further promote the feeding in the dense state.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"177 - 183"},"PeriodicalIF":1.4,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1804168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46100048","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 : 2020-08-01DOI: 10.1080/13640461.2020.1801561
F. Czerwinski
ABSTRACT The concept of converting dendritic structures into globular morphologies through solid-state deformation, termed as strain-induced melt activation (SIMA), is assessed. Although the original invention defined the specific two-stage deformation scenario, almost four decades of extensive research, involving a variety of ferrous and non-ferrous alloys, subjected to conventional and severe plastic deformations, caused its evolution. According to present understanding, any deformation of cast structures with a strain level sufficient to trigger recrystallisation leads to dendrite-to-globule transition during subsequent partial melting. It is proposed that the SIMA term should not only be associated with the particular deformation scenario but should be seen as a broad synonym for a variety of thermomechanical treatments, explored for controlling the solidification microstructure. Such an updated definition expands applicability of the SIMA concept from bulk billets to coarse particulates and fine powders.
{"title":"strain induced melt activation (SIMA): original concept, its impact and present understanding","authors":"F. Czerwinski","doi":"10.1080/13640461.2020.1801561","DOIUrl":"https://doi.org/10.1080/13640461.2020.1801561","url":null,"abstract":"ABSTRACT The concept of converting dendritic structures into globular morphologies through solid-state deformation, termed as strain-induced melt activation (SIMA), is assessed. Although the original invention defined the specific two-stage deformation scenario, almost four decades of extensive research, involving a variety of ferrous and non-ferrous alloys, subjected to conventional and severe plastic deformations, caused its evolution. According to present understanding, any deformation of cast structures with a strain level sufficient to trigger recrystallisation leads to dendrite-to-globule transition during subsequent partial melting. It is proposed that the SIMA term should not only be associated with the particular deformation scenario but should be seen as a broad synonym for a variety of thermomechanical treatments, explored for controlling the solidification microstructure. Such an updated definition expands applicability of the SIMA concept from bulk billets to coarse particulates and fine powders.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"157 - 164"},"PeriodicalIF":1.4,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1801561","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45325070","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 : 2020-07-29DOI: 10.1080/13640461.2020.1796294
V. Siddharth, D. Rao, B. R. Ramana Murthy
ABSTRACT An experimental study focused on the determination of mechanical properties of synthetic green sand system using Nagavali river sand by adding banana peel powder as an additive. Compression strength, shear strength, mould hardness bulk density and permeability are the various properties found in the laboratory following standard testing procedures. Sand aggregate is prepared by mixing the bentonite as binder and banana peel powder as an additive to the silica sand in various amounts. Encouraging results in terms of strength and hardness are obtained by testing the standard sand samples. In fact, the properties exhibited are almost similar to the values obtained by addition of 2% dextrin as an additive to the sand aggregate. Since the banana peel powder can be easily prepared which is most economical in terms of cost compared with dextrin, that can be an alternative additive in preparing the sand moulds to obtain adequate strength and hardness.
{"title":"Investigations on the suitability of banana peel powder as an alternative additive in synthetic green sand moulding system","authors":"V. Siddharth, D. Rao, B. R. Ramana Murthy","doi":"10.1080/13640461.2020.1796294","DOIUrl":"https://doi.org/10.1080/13640461.2020.1796294","url":null,"abstract":"ABSTRACT An experimental study focused on the determination of mechanical properties of synthetic green sand system using Nagavali river sand by adding banana peel powder as an additive. Compression strength, shear strength, mould hardness bulk density and permeability are the various properties found in the laboratory following standard testing procedures. Sand aggregate is prepared by mixing the bentonite as binder and banana peel powder as an additive to the silica sand in various amounts. Encouraging results in terms of strength and hardness are obtained by testing the standard sand samples. In fact, the properties exhibited are almost similar to the values obtained by addition of 2% dextrin as an additive to the sand aggregate. Since the banana peel powder can be easily prepared which is most economical in terms of cost compared with dextrin, that can be an alternative additive in preparing the sand moulds to obtain adequate strength and hardness.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"171 - 176"},"PeriodicalIF":1.4,"publicationDate":"2020-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1796294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44268567","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 : 2020-07-21DOI: 10.1080/13640461.2020.1797335
M. Tiryakioğlu
ABSTRACT Heterogeneous nucleation based on the spherical cap model has been used in this study to evaluate nucleation pressure and the number of hydrogen atoms necessary for nucleation. Calculations have shown that the minimum heterogeneous nucleation pressure that can be achieved is in the order of 1 GPa, which is four orders of magnitude larger than the values assumed in the literature. Implications of the results are discussed.
{"title":"On the heterogeneous nucleation pressure for hydrogen pores in liquid aluminium","authors":"M. Tiryakioğlu","doi":"10.1080/13640461.2020.1797335","DOIUrl":"https://doi.org/10.1080/13640461.2020.1797335","url":null,"abstract":"ABSTRACT Heterogeneous nucleation based on the spherical cap model has been used in this study to evaluate nucleation pressure and the number of hydrogen atoms necessary for nucleation. Calculations have shown that the minimum heterogeneous nucleation pressure that can be achieved is in the order of 1 GPa, which is four orders of magnitude larger than the values assumed in the literature. Implications of the results are discussed.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"153 - 156"},"PeriodicalIF":1.4,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1797335","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45507461","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 : 2020-06-08DOI: 10.1080/13640461.2020.1778151
A. Freulon, A. T. Trinh, J. Lacaze, B. Malard, K. Vu
ABSTRACT To study the influence of the microstructure of cast iron on the adhesion of an epoxy coating, ferritic, pearlitic and austempered samples were prepared in as-received, polished and oxidised states. A pull-off test (dry adhesion) was performed before immersing in water while the cross-cut test was made after 24 days of exposition in distilled water (wet adhesion). X-rays were combined with optical microscopy (LOM) and scanning electron microscopy (SEM) for surface analysis. The adhesion of the epoxy coating on the cast iron surface firstly depends on the roughness of the surface; polished samples showed high adherence by comparison with as-received samples. On the oxidised samples, the surface oxide significantly improves the adhesion of the coating in both dry and wet states for all three sample microstructure. The presence of carbide in the structure was observed to decrease adherence.
{"title":"Effect of cast iron microstructure on adherence of an epoxy protection","authors":"A. Freulon, A. T. Trinh, J. Lacaze, B. Malard, K. Vu","doi":"10.1080/13640461.2020.1778151","DOIUrl":"https://doi.org/10.1080/13640461.2020.1778151","url":null,"abstract":"ABSTRACT To study the influence of the microstructure of cast iron on the adhesion of an epoxy coating, ferritic, pearlitic and austempered samples were prepared in as-received, polished and oxidised states. A pull-off test (dry adhesion) was performed before immersing in water while the cross-cut test was made after 24 days of exposition in distilled water (wet adhesion). X-rays were combined with optical microscopy (LOM) and scanning electron microscopy (SEM) for surface analysis. The adhesion of the epoxy coating on the cast iron surface firstly depends on the roughness of the surface; polished samples showed high adherence by comparison with as-received samples. On the oxidised samples, the surface oxide significantly improves the adhesion of the coating in both dry and wet states for all three sample microstructure. The presence of carbide in the structure was observed to decrease adherence.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"165 - 170"},"PeriodicalIF":1.4,"publicationDate":"2020-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1778151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46053575","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 : 2020-05-03DOI: 10.1080/13640461.2020.1766278
E. Mardaras, R. González-Martínez, R. Bayón, L. Nastac, S. Méndez
ABSTRACT In this study, a chromium carbide layer was fabricated by an in-situ casting technique on ductile iron cast components. The procedure consists of (i) applying a ferrochrome slurry at the surfaces of silica sand moulds to create a surface layer (e.g. coating) and (ii) use a ductile iron alloy to cast the coated moulds. The microstructure of the realised surface layer was characterised and analysed via Scanning Electron Microscopy (SEM), optical microscopy (OM) and X-ray Diffraction (XRD).The corrosion behaviour of the samples was analysed by an electrochemical method using 0.03 M NaCl. The wear tests and Vickers hardness measurements were performed to determine the properties of the surface layer. It was determined that the layer is composed of chromium carbide (Cr7C3), ledeburite and pearlite. The ‘chromium carbide’constituent improved significantly both the wear resistance and the hardness of the surface layer. Electrochemical measurements have indicated that the carbide-based layer exhibits a lower corrosion resistance than the substrate (e.g. casting).
采用原位铸造技术在球墨铸铁件表面制备碳化铬层。该过程包括(i)在硅砂模具表面涂上铬铁浆料以形成表面层(例如涂层)和(ii)使用球墨铁合金铸造涂层模具。通过扫描电子显微镜(SEM)、光学显微镜(OM)和x射线衍射仪(XRD)对实现的面层微观结构进行了表征和分析。用电化学方法分析了样品在0.03 M NaCl溶液中的腐蚀行为。进行了磨损试验和维氏硬度测量，以确定表面层的性能。测定该层由碳化铬(Cr7C3)、莱氏体和珠光体组成。碳化铬成分显著提高了合金的耐磨性和表层硬度。电化学测量表明，碳化物基层的耐腐蚀性低于基材(如铸件)。
{"title":"Surface modification of ductile iron produced by an innovative in-situ casting technique","authors":"E. Mardaras, R. González-Martínez, R. Bayón, L. Nastac, S. Méndez","doi":"10.1080/13640461.2020.1766278","DOIUrl":"https://doi.org/10.1080/13640461.2020.1766278","url":null,"abstract":"ABSTRACT In this study, a chromium carbide layer was fabricated by an in-situ casting technique on ductile iron cast components. The procedure consists of (i) applying a ferrochrome slurry at the surfaces of silica sand moulds to create a surface layer (e.g. coating) and (ii) use a ductile iron alloy to cast the coated moulds. The microstructure of the realised surface layer was characterised and analysed via Scanning Electron Microscopy (SEM), optical microscopy (OM) and X-ray Diffraction (XRD).The corrosion behaviour of the samples was analysed by an electrochemical method using 0.03 M NaCl. The wear tests and Vickers hardness measurements were performed to determine the properties of the surface layer. It was determined that the layer is composed of chromium carbide (Cr7C3), ledeburite and pearlite. The ‘chromium carbide’constituent improved significantly both the wear resistance and the hardness of the surface layer. Electrochemical measurements have indicated that the carbide-based layer exhibits a lower corrosion resistance than the substrate (e.g. casting).","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"103 - 111"},"PeriodicalIF":1.4,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1766278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41452778","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 : 2020-05-03DOI: 10.1080/13640461.2020.1769318
R. N, M. Sam
ABSTRACT Functionally graded Cu-10Sn-5Ni/10B4C composite was fabricated using horizontal centrifugal casting. Microstructural and mechanical properties were superior at reinforcement-rich inner zone where wear tests were conducted based on response surface methodology five-level run order, using pin on disc tribometer. Results showed that wear rate increases linearly with increase in load and sliding velocity whereas with increased sliding distance, it increases non-linearly with reduced slope. Minimum wear is observed at optimum combination of load (10 N), velocity (1 m/s) and sliding distance (500 m). Worn surfaces were analysed using scanning electron microscope to determine the wear mechanisms. Results concluded applied load as the major influential parameter over wear rate leading to occurrence of deep grooves along with delamination at higher loads and shallow grooves along the sliding direction at lower loads. Fabricated composite proves the ability to replace conventional materials for automotive sliding applications, providing improved wear characteristics at dry sliding conditions.
{"title":"Microstructural, mechanical and tribological analysis of functionally graded copper composite","authors":"R. N, M. Sam","doi":"10.1080/13640461.2020.1769318","DOIUrl":"https://doi.org/10.1080/13640461.2020.1769318","url":null,"abstract":"ABSTRACT Functionally graded Cu-10Sn-5Ni/10B4C composite was fabricated using horizontal centrifugal casting. Microstructural and mechanical properties were superior at reinforcement-rich inner zone where wear tests were conducted based on response surface methodology five-level run order, using pin on disc tribometer. Results showed that wear rate increases linearly with increase in load and sliding velocity whereas with increased sliding distance, it increases non-linearly with reduced slope. Minimum wear is observed at optimum combination of load (10 N), velocity (1 m/s) and sliding distance (500 m). Worn surfaces were analysed using scanning electron microscope to determine the wear mechanisms. Results concluded applied load as the major influential parameter over wear rate leading to occurrence of deep grooves along with delamination at higher loads and shallow grooves along the sliding direction at lower loads. Fabricated composite proves the ability to replace conventional materials for automotive sliding applications, providing improved wear characteristics at dry sliding conditions.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"123 - 133"},"PeriodicalIF":1.4,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1769318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44544958","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 : 2020-05-03DOI: 10.1080/13640461.2020.1766279
P. Schmidt, M. Wessén, M. Lundberg, Z. Diószegi, E. Persson, Anton Marberg
ABSTRACT A high shake-out temperature after casting is beneficial from a production point of view due to the need of a shorter cooling line in the foundry. However, a higher shake-out temperature might also lead to increased residual stresses due to faster cooling. In order to get a good agreement between simulated and measured temperature curves it is important to adjust material data and heat transfer coefficients accordingly. A reduction of the thermal conductivity of the sand by 25% and a drastically increased HTC were the main adjustments. From the residual stress simulation, the most important lesson learned was the necessity to include the sand in the calculation. Especially internal sand cores can greatly restrict the thermal contraction of the casting. After this fine-tuning of the simulation a good agreement with measurements was obtained. It could be verified that an increased shake-out temperature will lead to significantly increased residual stresses.
{"title":"Measurement and simulation of residual stresses in grey cast iron as a function of shake-out temperature","authors":"P. Schmidt, M. Wessén, M. Lundberg, Z. Diószegi, E. Persson, Anton Marberg","doi":"10.1080/13640461.2020.1766279","DOIUrl":"https://doi.org/10.1080/13640461.2020.1766279","url":null,"abstract":"ABSTRACT A high shake-out temperature after casting is beneficial from a production point of view due to the need of a shorter cooling line in the foundry. However, a higher shake-out temperature might also lead to increased residual stresses due to faster cooling. In order to get a good agreement between simulated and measured temperature curves it is important to adjust material data and heat transfer coefficients accordingly. A reduction of the thermal conductivity of the sand by 25% and a drastically increased HTC were the main adjustments. From the residual stress simulation, the most important lesson learned was the necessity to include the sand in the calculation. Especially internal sand cores can greatly restrict the thermal contraction of the casting. After this fine-tuning of the simulation a good agreement with measurements was obtained. It could be verified that an increased shake-out temperature will lead to significantly increased residual stresses.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"112 - 119"},"PeriodicalIF":1.4,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1766279","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60012025","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 : 2020-05-03DOI: 10.1080/13640461.2020.1773053
G. Özer, Burçin Özbay, Z. Öter, G. Tarakci, M. S. Yılmaz, M. Bulduk, E. Koç, S. Acar, K. Güler
ABSTRACT In this study, Polymer (Primecast® 101-EOS)patterns were produced with the EOS Formiga P110 system, and these patterns were compared with conventional wax patterns using their suitability for the investment casting (IC) method. Besides, Scanning Electron Microscope (SEM) and Thermal Analysis (DSC and TGA) were applied produced to investigate the properties of Primecast® patterns and their suitability for the IC. A356 aluminium alloy castings were produced in a Vacuum-Assisted Casting (VAC) machine, and graded precision casting method using conventional wax and Primecast® patterns and surface roughness and dimensional accuracy measurements were carried out on the patterns and cast parts. In light of the data obtained from the study, Primecast® powder is thought to have several advantages for the ceramic shell IC method.
{"title":"Investigation of the surface quality and dimensional accuracy of polymer patterns produced by selective laser sintering (SLS) method for investment casting (IC)","authors":"G. Özer, Burçin Özbay, Z. Öter, G. Tarakci, M. S. Yılmaz, M. Bulduk, E. Koç, S. Acar, K. Güler","doi":"10.1080/13640461.2020.1773053","DOIUrl":"https://doi.org/10.1080/13640461.2020.1773053","url":null,"abstract":"ABSTRACT In this study, Polymer (Primecast® 101-EOS)patterns were produced with the EOS Formiga P110 system, and these patterns were compared with conventional wax patterns using their suitability for the investment casting (IC) method. Besides, Scanning Electron Microscope (SEM) and Thermal Analysis (DSC and TGA) were applied produced to investigate the properties of Primecast® patterns and their suitability for the IC. A356 aluminium alloy castings were produced in a Vacuum-Assisted Casting (VAC) machine, and graded precision casting method using conventional wax and Primecast® patterns and surface roughness and dimensional accuracy measurements were carried out on the patterns and cast parts. In light of the data obtained from the study, Primecast® powder is thought to have several advantages for the ceramic shell IC method.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"146 - 152"},"PeriodicalIF":1.4,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1773053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46550945","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 : 2020-05-03DOI: 10.1080/13640461.2020.1757917
G. Angella, R. Donnini, F. Zanardi
ABSTRACT A two diagram procedure was used to assess the microstructure effects on tensile strain hardening in different silicon strengthened ductile irons produced through different cooling rates. In the Matrix Assessment Diagram, the data from different ductile irons were identified through lines. While with Si 2.5 wt-% the intercept of the best fitting line was positive in agreement with the physical meaning of strain hardening, the intercept decreased with increasing silicon content and decreasing cooling rate, becoming unexpectedly negative with Si 4.5 wt-% and slow cooling rates. The negative intercepts were found to be related to graphite degeneracy. In the Integrity Assessment Diagram the effect of microstructure on ductility was investigated, reporting that ductility was reduced significantly by graphite degeneracy. So the two diagram procedure that was first proposed to classify ductile irons with different chemical compositions and production routes, can also indicate the presence of graphite degeneracy in ductile irons.
{"title":"Assessment of microstructure effects on tensile behaviour in silicon strengthened ductile irons produced through different cooling rates","authors":"G. Angella, R. Donnini, F. Zanardi","doi":"10.1080/13640461.2020.1757917","DOIUrl":"https://doi.org/10.1080/13640461.2020.1757917","url":null,"abstract":"ABSTRACT A two diagram procedure was used to assess the microstructure effects on tensile strain hardening in different silicon strengthened ductile irons produced through different cooling rates. In the Matrix Assessment Diagram, the data from different ductile irons were identified through lines. While with Si 2.5 wt-% the intercept of the best fitting line was positive in agreement with the physical meaning of strain hardening, the intercept decreased with increasing silicon content and decreasing cooling rate, becoming unexpectedly negative with Si 4.5 wt-% and slow cooling rates. The negative intercepts were found to be related to graphite degeneracy. In the Integrity Assessment Diagram the effect of microstructure on ductility was investigated, reporting that ductility was reduced significantly by graphite degeneracy. So the two diagram procedure that was first proposed to classify ductile irons with different chemical compositions and production routes, can also indicate the presence of graphite degeneracy in ductile irons.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"102 - 89"},"PeriodicalIF":1.4,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1757917","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41597474","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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