Abstract
Abstract HRB500E seismic steel bars are mainly used in high-rise buildings near the seismic zone. The influence of different niobium contents (0–0.023%) on the microstructure and mechanical properties of HRB500E seismic reinforcement was studied. Results showed that the grain size of ferrite was between 3.6 and 8.3 μm when only V was added. Meanwhile, as the niobium content increases, the ferrite particles are further refined. After adding niobium, the grain contribution increased by 9%. The addition of niobium significantly refined the grain size of HRB500E seismic reinforcement. The second-phase nano-elliptic precipitate is NbC. The precipitated phase is dispersed on the grain boundary and the matrix, and the dislocation density on the matrix promotes the precipitation of NbC particles along the dislocation line. The second-phase precipitation of niobium can form an effective pinning effect and then refine the pearlite spacing. The microhardness and the tensile strength also significantly improved. The yield strength increased from 509 to 570 MPa.
Highlights
HRB500E seismic steel bars are mainly used in high-rise buildings near the seismic zone
The present study investigated the effects of adding different contents of Nb and V on the microstructure and mechanical properties of HRB500E seismic reinforcement
The precipitated niobium in the second phase eliminates the adverse effects of solid solution niobium, and when more niobium is added to steel, more niobium carbonitride will be formed and fine parent austenite grains will be formed
Summary
Abstract: HRB500E seismic steel bars are mainly used in high-rise buildings near the seismic zone. The influence of different niobium contents (0–0.023%) on the microstructure and mechanical properties of HRB500E seismic reinforcement was studied. The steel bar bears huge local stress and strain at the crack place of concrete At this time, the safety performance of the building has an important relationship with the comprehensive mechanical properties of the reinforcement [1,2,3,4,5,6]. Seismic reinforcement can produce huge deformation of buildings, has high strain capacity, can delay the collapse time of buildings, and can provide escape time for people It can reduce casualties and property damage [7,8,9,10,11,12]. The present study investigated the effects of adding different contents of Nb and V on the microstructure and mechanical properties of HRB500E seismic reinforcement
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