球墨铸铁表面二维碳化物的激光原位合成及其拉伸性能研究  

Laser In-Situ Synthesis and Mechanical Properties of Two-Dimensional Carbides in Ductile Iron

作　　者：李泽光 张勇[1] LI Zeguang;ZHANG Yong(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2022年第2期85-89,共5页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金资助项目(60870009)。

摘　　要：对球墨铸铁进行激光表面熔凝处理,通过调控激光功率、扫描速度、光斑尺寸等参数变化,将球墨铸铁表面的石墨转变为二维碳化物.实验结果表明:在球墨铸铁的激光表面熔凝反应中,石墨球良好的光吸收能力使其吸收了激光产生的大量热量,形成石墨熔池,从而促进了石墨球向二维碳化物的转变;激光熔凝层的拉伸强度为279.5 MPa,远高于球墨铸铁基体的拉伸强度152.6 MPa.Aiming at the problem of low graphite strength in ductile iron,the ductile iron is treated by laser surface melting,and the graphite in the nodular cast iron is transformed into two-dimensional carbide by adjusting the parameters of laser power,scanning speed,spot size and so on.Experiment results show that in the laser surface melting reaction of the ductile iron,the good light absorption capacity of the graphite balls absorbs a large amount of heat generated by the laser,forming a graphite molten pool,and promoting the transformation of graphite balls into two-dimensional carbides.The tensile strength of the laser fused layer is 279.5 MPa,which is much higher than the tensile strength of the ductile iron matrix of 152.6 MPa.

关 键 词：球墨铸铁 激光熔凝 二维碳化物 石墨 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG143.5[一般工业技术—材料科学与工程]