Effects of micro-alloying and production process on precipitation behaviors and mechanical properties of HRB600

Effects of micro-alloying elements and production process on microstructure, mechanical properties and precipitates of 600 MPa grade rebars were studied by using pilot test, metallographic observa- tion, tensile test, thermodynamic calculation and transmission electron microscopy. The results show t...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2017-05, Vol.24 (5), p.536-543
Main Authors: Pan, Hong-bo, Zhang, Meng-jiao, Liu, Wei-ming, Yan, Jun, Wang, Hui-ting, Xie, Chang-sheng, Guo, Zhan
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Engineering
High-strength steel rebar
Machines
Manufacturing
Materials Engineering
Materials Science
Mechanical property
Metallic Materials
Micro-alloying
Physical Chemistry
Precipitation strengthening
Processes
Thermo-mechanical controlling process
Thermodynamics
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Summary:Effects of micro-alloying elements and production process on microstructure, mechanical properties and precipitates of 600 MPa grade rebars were studied by using pilot test, metallographic observa- tion, tensile test, thermodynamic calculation and transmission electron microscopy. The results show that the tested steels are composed of ferrite and pearlite, in which the conterlt range of pearlite is 33%-45%. For vanadium micro-alloyed steel, interphase preeipitation Strengthening effect of V can be promoted and the yield strength of tested steels can be increased with increasing V content and de- creasing finishing rolling temperature. The temperature of terminated cooling should be more than 700 ℃ when the water cooling is used. When niobium is added to the steel, more coarse （Nb,V）C,N precipitates are generated at high temperature, so that the solid solubility of precipitated phases of vanadium is reduced and the precipitation strengthening effect of vanadium is weakened.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(17)30081-X