Abstract
In this study, a 304/20MnSi stainless-steel clad rebar was prepared by single-pass compression process using the MMS-200 Thermal Mechanical Simulator. The impact of different degrees of deformation and deformation temperature on microstructure evolution and the mechanical properties of stainless steel clad rebars were investigated. The study indicated that with the increase of the degree of deformation, the content of pearlite in a carbon steel matrix was increased, and the grains refined. The metallurgical bonding of the bonded interface was formed under high temperature and high extrusion force. With the increase of the deformation temperature, more bainite was obtained on the side of carbon steel, and the grain size increased. The obvious diffusion of Fe, Cr and Ni elements near the bonding interface resulted in higher microhardness of the stainless steel side and smaller microhardness of the carbon steel side. Moreover, the engineering stress-strain curves obtained by the tensile test showed that the plastic deformation of stainless steel and carbon steel was more coordinated. With the increase of deformation temperature and the degree of deformation, the tensile strength of the stainless steel clad rebar was as high as 690 MPa and the elongation was 26%, which was superior to the properties of the clad rebar prepared by other process parameters.
Highlights
Due to its high service strength and low cost, the traditional carbon steel rebar has been widely used in the field of construction as reinforced concrete skeletons, but huge economic losses are caused because of corrosion
When the clad rebar underwent a small degree of deformation at a lower temperature, that is, T = 950 ◦ C, E= 50%, ferrite and pearlite were mainly obtained in the carbon steel matrix
Given that 50% degree of plastic deformation was given at 950 ◦ C, the phase transition was more likely to occur, and deformation could promote phase transition of ferrite and a large amount of pro-eutectoid ferrite is expected to precipitate during the cooling process
Summary
Due to its high service strength and low cost, the traditional carbon steel rebar has been widely used in the field of construction as reinforced concrete skeletons, but huge economic losses are caused because of corrosion. The thermal simulation technology which is based on the actual production process, simplifies the process conditions, and the prototype is replaced by the experimental model, and an equal proportion of sample or substitute material is used to simulate the production process on the equipment [11] This method can reveal the mechanical properties and microstructure evolution of metal materials during hot working deformation compared with the “empirical” method. The effects of two different degrees of deformation (50% and 70%) and two different deformation temperatures (950 ◦ C and 1050 ◦ C) on the microstructure and mechanical properties of the bonded interface of stainless steel rebar were studied, which could provide theoretical basis and technical guidance for the preparation of stainless steel clad rebar by hot rolled-cladding method in actual production
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