首页 | 本学科首页   官方微博 | 高级检索  
     检索      

Evaluation of the microstructure,secondary dendrite arm spacing,and mechanical properties of Al-Si alloy castings made in sand and Fe-Cr slag molds
作者姓名:I. Narasimha Murthy  J. Babu Rao
作者单位:Department of Metallurgical Engineering, Andhra University, Visakhapatnam 530003, India
基金项目:Authors would thank the DST–Fly Ash unit, New Delhi, India for their financial support
摘    要:The microstructure and mechanical properties of as-cast A356 (Al-Si) alloy castings were investigated. A356 alloy was cast into three different molds composed of sand, ferrochrome (Fe-Cr) slag, and a mixture of sand and Fe-Cr. A sodium silicate-CO2 process was used to make the necessary molds. Cylindrical-shaped castings were prepared. Cast products with no porosity and a good surface finish were achieved in all of the molds. These castings were evaluated for their metallography, secondary dendrite arm spacing (SDAS), and mechanical properties, including hardness, compression, tensile, and impact properties. Furthermore, the tensile and impact samples were analyzed by fractography. The results show that faster heat transfer in the Fe-Cr slag molds than in either the silica sand or mixed molds led to lower SDAS values with a refined microstructure in the products cast in Fe-Cr slag molds. Consistent and enhanced mechanical properties were observed in the slag mold products than in the castings obtained from either sand or mixed molds. The fracture surface of the slag mold castings shows a dimple fracture morphology with a transgranular fracture nature. However, the fracture surfaces of the sand mold castings display brittle fracture. In conclusion, products cast in Fe-Cr slag molds exhibit an improved surface finish and enhanced mechanical properties compared to those of products cast in sand and mixed molds.

关 键 词:silica  sand    ferrochrome  slag    alloy  castings    secondary  dendrite  arm  spacing    mechanical  properties

Evaluation of the microstructure,secondary dendrite arm spacing,and mechanical properties of Al–Si alloy castings made in sand and Fe–Cr slag molds
I. Narasimha Murthy,J. Babu Rao.Evaluation of the microstructure,secondary dendrite arm spacing,and mechanical properties of Al-Si alloy castings made in sand and Fe-Cr slag molds[J].International Journal of Minerals,Metallurgy and Materials,2017,24(7):784-793.
Authors:I Narasimha Murthy  J Babu Rao
Institution:Department of Metallurgical Engineering, Andhra University, Visakhapatnam 530003, India
Abstract:The microstructure and mechanical properties of as-cast A356 (Al–Si) alloy castings were investigated. A356 alloy was cast into three different molds composed of sand, ferrochrome (Fe–Cr) slag, and a mixture of sand and Fe–Cr. A sodium silicate–CO2 process was used to make the necessary molds. Cylindrical-shaped castings were prepared. Cast products with no porosity and a good surface finish were achieved in all of the molds. These castings were evaluated for their metallography, secondary dendrite arm spacing (SDAS), and mechanical properties, including hardness, compression, tensile, and impact properties. Furthermore, the tensile and impact samples were analyzed by fractography. The results show that faster heat transfer in the Fe–Cr slag molds than in either the silica sand or mixed molds led to lower SDAS values with a refined microstructure in the products cast in Fe–Cr slag molds. Consistent and enhanced mechanical properties were ob-served in the slag mold products than in the castings obtained from either sand or mixed molds. The fracture surface of the slag mold castings shows a dimple fracture morphology with a transgranular fracture nature. However, the fracture surfaces of the sand mold castings display brittle fracture. In conclusion, products cast in Fe–Cr slag molds exhibit an improved surface finish and enhanced mechanical properties compared to those of products cast in sand and mixed molds.
Keywords:silica sand  ferrochrome slag  alloy castings  secondary dendrite arm spacing  mechanical properties
本文献已被 万方数据 SpringerLink 等数据库收录!
点击此处可从《矿物冶金与材料学报》浏览原始摘要信息
点击此处可从《矿物冶金与材料学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号