Pub Date : 1996-01-01DOI: 10.1080/09534962.1996.11819212
J. A. Taylor
Many foundries have intermittently experienced a major outbreak of casting rejects in which the alloy, although clearly within specification, nevertheless appears to be the primary cause of the problem. Minor changes in metal composition or metal quality can be sufficient to facilitate the formation of casting defects, within normally castable products, even when normal process conditions prevail. In the Al-Si based foundry alloys, the formation of porosity and shrinkage defects is sensitive to both metal composition and metal quality. However, the casting design and the actual processing conditions used can alter the sensitivity of the response to variations occurring within the metal. A number of metal-dependent factors of particular relevance to the castability of aluminium foundry alloys are discussed in this review. These include hydrogen level, oxidation tendency, the presence of inclusions, total volumetric shrinkage, alloy freezing range, dendritic growth conditions (dendrite arm spacing, coherenc...
{"title":"Metal-related castability effects in aluminium foundry alloys","authors":"J. A. Taylor","doi":"10.1080/09534962.1996.11819212","DOIUrl":"https://doi.org/10.1080/09534962.1996.11819212","url":null,"abstract":"Many foundries have intermittently experienced a major outbreak of casting rejects in which the alloy, although clearly within specification, nevertheless appears to be the primary cause of the problem. Minor changes in metal composition or metal quality can be sufficient to facilitate the formation of casting defects, within normally castable products, even when normal process conditions prevail. In the Al-Si based foundry alloys, the formation of porosity and shrinkage defects is sensitive to both metal composition and metal quality. However, the casting design and the actual processing conditions used can alter the sensitivity of the response to variations occurring within the metal. A number of metal-dependent factors of particular relevance to the castability of aluminium foundry alloys are discussed in this review. These include hydrogen level, oxidation tendency, the presence of inclusions, total volumetric shrinkage, alloy freezing range, dendritic growth conditions (dendrite arm spacing, coherenc...","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75465546","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 : 1996-01-01DOI: 10.1080/09534962.1996.11819207
J. Massone, R. Boeri, O. Moncada, J. Sikora
{"title":"Mechanical properties of partially austempered ductile iron","authors":"J. Massone, R. Boeri, O. Moncada, J. Sikora","doi":"10.1080/09534962.1996.11819207","DOIUrl":"https://doi.org/10.1080/09534962.1996.11819207","url":null,"abstract":"","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87575596","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 : 1996-01-01DOI: 10.1080/09534962.1996.11819208
C. Shieh, T. Lui, L. Chen, W. T. Lin
{"title":"Carbide formation in an austempered ductile cast iron during prolonged austempering and tensile loading at elevated temperatures","authors":"C. Shieh, T. Lui, L. Chen, W. T. Lin","doi":"10.1080/09534962.1996.11819208","DOIUrl":"https://doi.org/10.1080/09534962.1996.11819208","url":null,"abstract":"","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85892898","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 : 1996-01-01DOI: 10.1080/09534962.1996.11819211
S. Singh, A. Chakrabarti
{"title":"Inclusion removal from liquid steel by filtration and salt treatment","authors":"S. Singh, A. Chakrabarti","doi":"10.1080/09534962.1996.11819211","DOIUrl":"https://doi.org/10.1080/09534962.1996.11819211","url":null,"abstract":"","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73653153","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 : 1996-01-01DOI: 10.1080/09534962.1996.11819210
C. Cheng, T. Lui, L. Chen
{"title":"A study of the 500 to 900°C tensile deformation behaviour of spheroidal graphite cast iron","authors":"C. Cheng, T. Lui, L. Chen","doi":"10.1080/09534962.1996.11819210","DOIUrl":"https://doi.org/10.1080/09534962.1996.11819210","url":null,"abstract":"","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88769035","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 : 1995-11-01DOI: 10.1080/09534962.1995.11819203
A. Hǻkonsen, O. R. Myhr
This paper deals with the temperature distribution in direct-chill (DC) continuous casting and describes how results from a few computer simulations can form the basis for the construction of more generally applicable process diagrams based on dimensionless groups. Such diagrams were constructed for the temperature distribution in the steady-state period of the casting process for different types of aluminium alloys. The accuracy of these diagrams was checked extensively against literature data and revealed good correlations. Since the constructed diagrams are valid for a range of different casting conditions, they can be applied for sensitivity analysis, i.e. to obtain a general overview of the process and the relative importance of the different parameters.
{"title":"Dimensionless diagrams for the temperature distribution in direct-chill continuous casting","authors":"A. Hǻkonsen, O. R. Myhr","doi":"10.1080/09534962.1995.11819203","DOIUrl":"https://doi.org/10.1080/09534962.1995.11819203","url":null,"abstract":"This paper deals with the temperature distribution in direct-chill (DC) continuous casting and describes how results from a few computer simulations can form the basis for the construction of more generally applicable process diagrams based on dimensionless groups. Such diagrams were constructed for the temperature distribution in the steady-state period of the casting process for different types of aluminium alloys. The accuracy of these diagrams was checked extensively against literature data and revealed good correlations. Since the constructed diagrams are valid for a range of different casting conditions, they can be applied for sensitivity analysis, i.e. to obtain a general overview of the process and the relative importance of the different parameters.","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76989290","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 : 1995-11-01DOI: 10.1080/09534962.1995.11819205
S. Katz, J. Carter, V. Laxmanan
A critical review of the various theories which have been proposed to explain the occurrence of aluminium-induced sub-surface gas defects (“pinholes”) in iron castings is presented. These theories do not adequately explain the occurrence of the defect, and also do not seem to point to effective solutions to the pinholing problem. A new mechanism for pinhole formation is presented here which involves the reaction of aluminium nitride with iron oxide to produce nitrogen, alumina, and iron. It is suggested that the nitrogen gas bubble produced by this reaction remains trapped beneath the surface of the casting and constitutes the pinhole defect. This new mechanism appears to be consistent with most of the experimental observations on pinholing.
{"title":"A new theory for aluminium-induced gas defects in iron castings","authors":"S. Katz, J. Carter, V. Laxmanan","doi":"10.1080/09534962.1995.11819205","DOIUrl":"https://doi.org/10.1080/09534962.1995.11819205","url":null,"abstract":"A critical review of the various theories which have been proposed to explain the occurrence of aluminium-induced sub-surface gas defects (“pinholes”) in iron castings is presented. These theories do not adequately explain the occurrence of the defect, and also do not seem to point to effective solutions to the pinholing problem. A new mechanism for pinhole formation is presented here which involves the reaction of aluminium nitride with iron oxide to produce nitrogen, alumina, and iron. It is suggested that the nitrogen gas bubble produced by this reaction remains trapped beneath the surface of the casting and constitutes the pinhole defect. This new mechanism appears to be consistent with most of the experimental observations on pinholing.","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75205218","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 : 1995-11-01DOI: 10.1080/09534962.1995.11819201
Şemsettin Özdemir, E. Atasoy
{"title":"A new approach to feeder dimensioning","authors":"Şemsettin Özdemir, E. Atasoy","doi":"10.1080/09534962.1995.11819201","DOIUrl":"https://doi.org/10.1080/09534962.1995.11819201","url":null,"abstract":"","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83668065","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 : 1995-11-01DOI: 10.1080/09534962.1995.11819204
J. Lewandowski, M. Holtzer
During the formation of surface defects in a casting an important part is played by the surface energy and by the phenomenon of wettability of the moulding material by a liquid alloy. The surface t...
在铸件表面缺陷的形成过程中，表面能和液态合金对成型材料的润湿性起着重要的作用。表面…
{"title":"An investigation of wettability and work of adhesion in ferrous alloy/moulding sand systems","authors":"J. Lewandowski, M. Holtzer","doi":"10.1080/09534962.1995.11819204","DOIUrl":"https://doi.org/10.1080/09534962.1995.11819204","url":null,"abstract":"During the formation of surface defects in a casting an important part is played by the surface energy and by the phenomenon of wettability of the moulding material by a liquid alloy. The surface t...","PeriodicalId":9691,"journal":{"name":"Cast Metals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89260817","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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