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Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel 被引量:9

Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel
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摘要 The microstructures and properties of hot-rolled low-carbon ferritic steel have been investigated by optical microscopy, field-emission scanning electron microscopy, transmission electron microscopy, and tensile tests after isothermal transformation from 600°C to 700°C for 60 min. It is found that the strength of the steel decreases with the increment of isothermal temperature, whereas the hole expansion ratio and the fraction of high-angle grain boundaries increase. A large amount of nanometer-sized carbides were homogeneously distributed throughout the material, and fine(Ti, Mo)C precipitates have a significant precipitation strengthening effect on the ferrite phase because of their high density. The nanometer-sized carbides have a lattice parameter of 0.411-0.431 nm. After isothermal transformation at 650°C for 60 min, the ferrite phase can be strengthened above 300 MPa by precipitation strengthening according to the Ashby-Orowan mechanism. The microstructures and properties of hot-rolled low-carbon ferritic steel have been investigated by optical microscopy, field-emission scanning electron microscopy, transmission electron microscopy, and tensile tests after isothermal transformation from 600°C to 700°C for 60 min. It is found that the strength of the steel decreases with the increment of isothermal temperature, whereas the hole expansion ratio and the fraction of high-angle grain boundaries increase. A large amount of nanometer-sized carbides were homogeneously distributed throughout the material, and fine(Ti, Mo)C precipitates have a significant precipitation strengthening effect on the ferrite phase because of their high density. The nanometer-sized carbides have a lattice parameter of 0.411-0.431 nm. After isothermal transformation at 650°C for 60 min, the ferrite phase can be strengthened above 300 MPa by precipitation strengthening according to the Ashby-Orowan mechanism.
出处 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第3期266-272,共7页 矿物冶金与材料学报(英文版)
基金 financial support by the National Natural Science Foundation of China (No. 51271035) the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20110006110007)
关键词 ferritic steel NANOPARTICLES mechanical properties carbides PRECIPITATION strengthening ferritic steel nanoparticles mechanical properties carbides precipitation strengthening
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