气缸套用等温淬火球墨铸铁的组织和性能  

Microstructure and Mechanical Properties of Austempered Ductile Iron for Cylinder Liner

作　　者：高广东[1,2] 熊毅[1] 任凤章[1] 徐超 刘治军 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]中原内配集团股份有限公司,河南孟州454750

出　　处：《河南科技大学学报（自然科学版）》2015年第6期5-9,4,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(50801021);河南省高等学校青年骨干教师基金项目(2011GGJS-070);河南省科技创新杰出人才支持计划基金项目(144200510009)

摘　　要：采用扫描电镜、电子拉伸试验机、布氏硬度计等仪器研究了气缸套用新型球墨铸铁等温淬火前、后的组织特性及力学性能。研究结果表明:在本试验条件下,该球墨铸铁的最佳热处理工艺为920℃奥氏体化90 min、360℃等温淬火80 min。此时基体组织为针状贝氏体加少量残余奥氏体组织,抗拉强度和布氏硬度适中,具有优良的强度指标和切削加工性能,同时摩擦磨损性能也得到显著改善。等温淬火使得球墨铸铁拉伸断口形貌由处理前的脆性断裂向处理后的韧性断裂转变。The microstructure and mechanical properties of austempered ductile irons( ADI) for cylinder liner were investigated by scanning electron microscopy( SEM),electronic tensile testing machine and Brinell hardness. The results show that under the experiment condition,the optimal heat treatment process of ductile iron is austenitizing temperature at 920 ℃ for 90 min and austempering temperature at 360 ℃ for 80 min. At that time the microstructure of the matrix is acicular bainite and a small amount of retained austenite. The tensile strength and Brinell hardeness are moderate. The ductile iron has good strength and cutting performance. The friction and wear properties are significantly improved. The tensile fracture morphology of ductile iron is changed from brittle fracture to ductile fracture after austempering treatment.

关 键 词：球墨铸铁 等温淬火 组织 性能 

分 类 号：TF593.4[冶金工程—钢铁冶金] TG113[金属学及工艺—物理冶金]