HREM Observation of Age-Precipitated Particles in Practical Cu-bearing Ultra-Low Carbon Steels  

作　　者：Guiquan Yin Caifu Yang Yinong Lu 

机构地区：[1]School of Materials Science and Engineering, Anhm University of Technology, Ma'anshan 243002, China [2]Anhui Key Lab of Metal Material and Processing, Ma'anshan 243002, China [3]Institute for Structure Material Research, Central Iron and Steel Research Institute, Beijing 100081, China [4]School of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China

出　　处：《Journal of Materials Science & Technology》2010年第5期433-438,共6页材料科学技术（英文版）

基　　金：supported by the National High-Tech Research and Development Program of China ("863 Program", Grant Nos. 2007AA03A228 and 2005AA305G70)

摘　　要：Morphology,distribution and crystal structures of age-precipitated particles in practical Cu-bearing steels with ultra-low carbon were studied by high resolution electron microscopy（HREM）.The age-precipitation behavior was explored when poly-microalloying elements Cu,Nb,Cr,Mo and Ni were used and ε-Cu particles coexisted with carbides（carbonitrides） in steels.The fine dispersed ε-Cu particles and carbides of microalloying element Nb,Cr,Mo being about 10 nm only in size were observed in peak aging specimens and over-aging specimens.The twin structures and stacking faults in the particles and the transient structures formed in the early stage of the particle precipitation were also observed.The crystal structure of three types of age-precipitation particles was firstly identified by lattice streaks in HREM images of the single particles.The experimental method identifying crystal structure of fine and dispersed particles using HREM images of single particle was proposed.Morphology,distribution and crystal structures of age-precipitated particles in practical Cu-bearing steels with ultra-low carbon were studied by high resolution electron microscopy（HREM）.The age-precipitation behavior was explored when poly-microalloying elements Cu,Nb,Cr,Mo and Ni were used and ε-Cu particles coexisted with carbides（carbonitrides） in steels.The fine dispersed ε-Cu particles and carbides of microalloying element Nb,Cr,Mo being about 10 nm only in size were observed in peak aging specimens and over-aging specimens.The twin structures and stacking faults in the particles and the transient structures formed in the early stage of the particle precipitation were also observed.The crystal structure of three types of age-precipitation particles was firstly identified by lattice streaks in HREM images of the single particles.The experimental method identifying crystal structure of fine and dispersed particles using HREM images of single particle was proposed.

关 键 词：Practical Cu-bearing steels HREM image Age-precipitated particles Crystal structure identification 

分 类 号：TG142.13[一般工业技术—材料科学与工程] TB383[金属学及工艺—金属材料]