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Structures and Properties of Cast Irons Reinforced by Trace Addition of Modified SiC Nanopowders
Jian-wei Li, Mei-ling Chen, Hong Gao, Ying-hua Zhao*
Author NameAffiliationE-mail
Jian-wei Li Mechanical and Power Engineering Institute, East China University of Science and Technology, Shanghai 200237, China;  
Mei-ling Chen Material and Science Engineering Institute, Dalian Jiaotong University, Dalian 116028, China;  
Hong Gao Material and Science Engineering Institute, Dalian Jiaotong University, Dalian 116028, China;  
Ying-hua Zhao* Institue of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, China yhzhao@newmail.dlmu.edu.cn 
Abstract:
"To improve the performance of traditional cast iron, trance amount of surface modified nanometer SiC powders were added into the melted iron. The microstructures, the mechanical properties, as well as the wear resistance were investigated. The trace addition of SiC nano-powders were active due to the presence of structural defects arising from the treatment, they were eoient in affecting not only the generation and growth of crystals but also change the morphology of graphite. On the other hand, the addition of SiC nanopowders as heterogeneous seedings in the crystallization of liquid metals lead to the changing of supercooling temperature, so the ratio of ferrite and pearlite was changed. The mechanical characteristics and wear resistance were enhanced as a result of the improved graphite shape and changed matrix composition caused by the trace addition of SiC nanopowders (in amounts of about 0.01% mass). The strengthening mechanism and the free gap between powders were also discussed. It is suggested that the tensile strength, toughness, as well as the wear resistance can be improved simultaneously, which indicates the novel strengthening technology by trace addition of nanopowders is promising to extend to large-scale industrial production."
Key words:  Surface modified SiC nanometer powders, Cast iron, microstructure, Mechanical properties, Wear resistance
FundProject:辽宁省教育厅基金资助项目;辽宁省科技攻关项目
痕量改性纳米SiC粉体强化铸铁的组织性能
李建卫,陈美玲,高宏,赵颖华*
摘要:
"为了提高传统铸铁材料的性能,对经过表面改性处理的纳米SiC粉体进行强化处理,并对微观组织、力学性能以及耐磨损性能进行了研究.结果表明,经过改性处理后,纳米SiC粉体表面形成结构缺陷,增加了表面活性,不仅有利于结晶形核,而且改善了石墨形态.作为外来异质核心的纳米SiC粉体改变了过冷度,导致基体组织中铁素体和珠光体比例发生变化.此外,加入质量分数仅为0.01%的纳米SiC粉体,就能够有效提高铸铁的力学性能和耐磨损性能,并在此基础上探讨了强化机理以及粉体之间的自由距."
关键词:  表面改性纳米SiC粉体,铸铁,微观组织,力学性能,耐磨损性能
DOI:10.1088/1674-0068/20/06/625-631
分类号: