硼对含碳化物等温淬火球墨铸铁组织和性能的影响  

Effect of Boron on Microstructure and Properties of Carbidic Austempered Ductile Iron

作　　者：韩成府 孙玉福[1] 吴越[1,2] 赵靖宇[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450002 [2]陕西星王企业集团有限公司,陕西西安710065

出　　处：《铸造》2015年第5期391-394,共4页Foundry

摘　　要：研究了不同硼含量对含碳化物等温淬火球墨铸铁（CADI）的组织、力学性能及耐磨性能的影响。结果表明：铸态下，随着硼含量的增加，石墨球数量减少，球径增加，球化率降低，碳化物数量增多。经900℃奥氏体化保温1．5h，280℃等温淬火保温1．5h后，试样组织为奥铁体（针状铁素体＋残余奥氏体）、石墨球和一定数量的碳化物，硼主要以Fe2B和Fe23（CB）6存在。当硼含量在0．020％~0．062％时，随着硼含量的增加，试样的洛氏硬度、耐磨性均提高，冲击韧度降低。当硼含量为0．047％时，试样洛氏硬度可达HRC56．7，冲击韧度可达8．7J／cm2，磨损率为0．190mg／m。The effect of boron on microstructure and properties of CADI were investigated. The results show that graphite spheroidization level reduces, graphite size increases, the number of graphite declines, and the amount of carbide increases in the as-cast specimens with the increase of the content of boron. After austenitizing at 900 ℃ for 1.5 h and austempered at 280 ℃ for 1.5 h, the microstructure is composed of graphite nodule, acicular ferrite, retained austenite and a certain amount of carbide, and the forms of boron are Fe2B and Fe23（CB）6. In the range of boron content containing 0.020%-0.062%, the Rockwell hardness and wear resistance rise while the impact toughness decreases. With 0.047% boron, the Rockwell hardness of the sample reaches HRC 56.7, while the impact toughness and wear rate acquire 8.7 J/era2 and 0.190 mg/m respectively.

关 键 词：CADI 硼 洛氏硬度 冲击韧度 耐磨性 

分 类 号：TG143.5[一般工业技术—材料科学与工程]