Microstructure Evolution and Microhardness of Ultrafine-grained High Carbon Steel during Multiple Laser Shock Processing  

作　　者：Yi XIONG Tian-tian HE Feng-zhang REN Peng-yan LI Lu-fei CHEN Alex A.VOLINSKY 

机构地区：[1]School of Materials Science and Engineering,Henan University of Science and Technology [2]Henan Collaborative Innovation Center of Non-ferrous Metal Generic Technology [3]Institute of Metal Research,Chinese Academy of Sciences [4]Department of Mechanical Engineering,University of South Florida,Tampa FL 33620,USA

出　　处：《Journal of Iron and Steel Research International》2015年第1期55-59,共5页

基　　金：Sponsored by National Natural Science Foundation of China(50801021,51201061);Program for Young Key Teachers in Henan Province of China(2011GGJS-070);Program for Henan Province for Science and Technology Innovation Excellent Talents of China(144200510001)

摘　　要：Surface microstructure and microhardness of （ferrite＋ cementite） microduplex structure of the ultrafine- grained high carbon steel after laser shock processing （LSP） with different impact times were investigated by means of scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD） and microhardness measurements. Equiaxed ferrite grains were refined from 400 to 150 nm, and the cementite lamellae were fully spheroidized, with a decrease of the particle diameter from 150 to 100 nm as the impact times increased. The cementite dissolution was enhanced significantly. Correspondingly, the lattice parameter of α-Fe and microhard- hess increased with the impact times.Surface microstructure and microhardness of （ferrite＋ cementite） microduplex structure of the ultrafine- grained high carbon steel after laser shock processing （LSP） with different impact times were investigated by means of scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD） and microhardness measurements. Equiaxed ferrite grains were refined from 400 to 150 nm, and the cementite lamellae were fully spheroidized, with a decrease of the particle diameter from 150 to 100 nm as the impact times increased. The cementite dissolution was enhanced significantly. Correspondingly, the lattice parameter of α-Fe and microhard- hess increased with the impact times.

关 键 词：ultrafine-grained high carbon steel laser shock processing impact times MICROSTRUCTURE MICROHARDNESS 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG142.31[一般工业技术—材料科学与工程]