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Hot deformation behavior and microstructural evolution of Nb-V-Ti microalloyed ultra-high strength steel

Journal Article


Abstract


  • The hot deformation behavior of Nb-V-Ti microalloyed ultra-high strength steel was investigated by isothermal compression at 900-1200 ��C with strain rates from 0.01 to 10 s-1. The microstructure evolution and precipitation behavior were studied using an optical microscope and a transmission electron microscope Results indicate that the peak stress of experimental steel increases with increasing the strain rate and decreasing the deformation temperature. The constitutive equation of hot deformation was developed with the activation energy Q being about 407.29 kJ/mol. The processing maps were also obtained to identify the instable regions of the flow behavior and to evaluate the efficiency of hot deformation. The size of dynamically recrystallized grains increases gradually with a decrease in the strain rate. Three types of carbides were identified, namely M3C, rich-Ti MC, and rich-Nb MC. With the increase of the deformation rate, the amounts of carbides increase, and the average sizes of the carbides decrease gradually.

Publication Date


  • 2017

Citation


  • Dong, J., Li, C., Liu, C., Huang, Y., Yu, L., Li, H., & Liu, Y. (2017). Hot deformation behavior and microstructural evolution of Nb-V-Ti microalloyed ultra-high strength steel. Journal of Materials Research, 32(19), 3777-3787. doi:10.1557/jmr.2017.365

Scopus Eid


  • 2-s2.0-85032643186

Start Page


  • 3777

End Page


  • 3787

Volume


  • 32

Issue


  • 19

Place Of Publication


Abstract


  • The hot deformation behavior of Nb-V-Ti microalloyed ultra-high strength steel was investigated by isothermal compression at 900-1200 ��C with strain rates from 0.01 to 10 s-1. The microstructure evolution and precipitation behavior were studied using an optical microscope and a transmission electron microscope Results indicate that the peak stress of experimental steel increases with increasing the strain rate and decreasing the deformation temperature. The constitutive equation of hot deformation was developed with the activation energy Q being about 407.29 kJ/mol. The processing maps were also obtained to identify the instable regions of the flow behavior and to evaluate the efficiency of hot deformation. The size of dynamically recrystallized grains increases gradually with a decrease in the strain rate. Three types of carbides were identified, namely M3C, rich-Ti MC, and rich-Nb MC. With the increase of the deformation rate, the amounts of carbides increase, and the average sizes of the carbides decrease gradually.

Publication Date


  • 2017

Citation


  • Dong, J., Li, C., Liu, C., Huang, Y., Yu, L., Li, H., & Liu, Y. (2017). Hot deformation behavior and microstructural evolution of Nb-V-Ti microalloyed ultra-high strength steel. Journal of Materials Research, 32(19), 3777-3787. doi:10.1557/jmr.2017.365

Scopus Eid


  • 2-s2.0-85032643186

Start Page


  • 3777

End Page


  • 3787

Volume


  • 32

Issue


  • 19

Place Of Publication