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

作　　者：Hong-bo Pan Meng-jiao Zhang Wei-ming Liu Jun Yan Hui-ting Wang Chang-sheng Xie Zhan Guo 

机构地区：[1]Key Laboratory of Metallurgical Emission Reduction & Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan 243002, Anhui, China [2]Anhui Province Key Laboratory of Metallurgy Engineering & Resources Recycling, Anhui University of Technology, Ma'anshan 243002, Anhui, China [3]School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243002, Anhui, China [4]Technology Center, Ma'anshan Iron & Steel Company Limited, Ma'anshan 243000, Anhui, China

出　　处：《Journal of Iron and Steel Research International》2017年第5期536-543,共8页

基　　金：supported by Natural Science Research Project of Anhui Province of China (KJ2016A091);Natural Science Foundation of Anhui Province (1708085ME116);Science and Technology Research Program of Anhui Province of China (1201a0201005)

摘　　要：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.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.

关 键 词：Micro-alloying High-strength steel rebar THERMO-MECHANICAL controlling process Mechanical property Precipitation strengthening THERMODYNAMICS 

分 类 号：TG142.1[一般工业技术—材料科学与工程]