一种新型球墨铸铁的等温淬火工艺研究  

Study on Isothermal Quenching Process of A New Ductile Iron

作　　者：禹灿 任鹏禾 黄为 王威明 许晓嫦[1] YU Can;REN Penghe;HUANG Wei;WANG Weiming;XU Xiaochang(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Changsha Jinlong Foundry Industry Co.,Ltd.,Changsha 410144,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]长沙金龙铸造实业有限公司,湖南长沙410144

出　　处：《热加工工艺》2021年第20期126-130,共5页Hot Working Technology

基　　金：长沙市重大科技专项项目(KQ1601010)。

摘　　要：研究了一种新型球墨铸铁的等温淬火工艺。对不同热处理状态下的球墨铸铁进行金相、X射线衍射、硬度、拉伸等试验检测,结果表明:最佳热处理工艺参数为奥氏体化温度860℃、时间60 min,等温淬火温度340℃、时间60min,其基体组织为针状的贝氏体以及均匀分布于贝氏体之间的残余奥氏体。此时,球墨铸铁的抗拉强度为1228 MPa,伸长率为8.1%。The austempering process of a new type of ductile iron was studied.X-ray diffraction,hardness and tensile test of ductile iron under different heat treatment conditions were carried out.The results show that,the optimum heat treatment parameters are austenitizing temperature at 860℃for 60 min,isothermal quenching temperature at 340℃for 60 min.The matrix structure is acicular bainite and the residual austenite distributed uniformly between bainite.At this time,the tensile strength and elongation of ductile iron are 1228 MPa and 8.1%,respectively.

关 键 词：球墨铸铁 奥氏体化工艺 等温淬火 组织和性能 

分 类 号：TG156.3[金属学及工艺—热处理] TG143.5[金属学及工艺—金属学]