等温处理过程中冷拔珠光体钢丝的组织及其性能  

Evolution of microstructure and mechanical properties of cold drawn pearlitic steel wires during isothermal treatment

作　　者：沈云霞[1] 方峰[1] 蒋建清[1] 

机构地区：[1]东南大学江苏省先进金属材料高技术研究重点实验室,江苏南京211189

出　　处：《材料热处理学报》2009年第5期83-86,共4页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展规划项目(2007CB616903)

摘　　要：对冷拔钢丝进行不同保温时间下的等温处理,研究此过程中钢丝组织、力学性能的变化。等温初期,铁素体片中析出细小渗碳体颗粒,钢丝的抗拉强度有所上升,塑性急剧下降,并出现扭转分层现象。等温后期,渗碳体片发生球化,析出相长大,并且铁素体片发生明显回复,三者综合作用造成钢丝的抗拉强度下降,塑性提高。The effect of isothermal time on microstructure and mechanical properties of cold drawn peaditic steel wires was investigated. The results show that strength of the wire increases, its elongation decreases and torsion delamination occurs at initial stage of the isothermal treatment. These phenomena are resulted from the precipitation of small cementite particles in lamellar ferrite. At the later isothermal stage, the lamellar eementite begins to spheroidize, the precipitated particles grow up and recovery of the lamellar ferrite takes place, resulting in decrease of strength and increase of elongation for the pearlitic steel wires.

关 键 词：珠光体钢 渗碳体 球化 

分 类 号：TG142.21[一般工业技术—材料科学与工程] TG356.52[金属学及工艺—金属材料]