Abstract
In order to research the effect of heat treatment on the microstructure and corrosion resistance of stainless/carbon steel bimetal plate, the annealing process at 700°C with different times was carried out for stainless/carbon steel bimetal plate. Because the carbon content of carbon steel was higher than that of stainless steel, the carbon would diffuse from carbon steel to stainless steel in the bimetal plate during the annealing process. The carbon diffusion would cause the thickness of the decarburized layer in carbon steel and the carbon content of stainless steel to increase. The carbon diffusion would be ongoing with the annealing process until the carbon content of stainless steel reached 0.08%. The higher carbon content could help in the formation of more chromium-depleted regions in the stainless steel surface, causing the stainless steel in the bimetal plate to have a poorer surface corrosion resistance than that of stainless steel under the same annealing conditions.
Highlights
Due to its good mechanical properties and excellent corrosion resistance, type 304 austenitic stainless steel is one of the most widely utilized ferrous materials in many engineering fields [1, 2]
The surface corrosion resistance of all the samples was researched by polarization test and electrochemical impedance spectroscopy (EIS). e polarization tests were conducted in 3.5% NaCl solution at a scan rate of 1 mV/s
The D area and E area correspond to the area near the interface in Figure 6 and the area away from the interface in Figure 6, respectively. e carbon distribution in the thickness direction of the bimetal plate corresponds well to the different microstructures in Figures 5 and 6. e above results are in agreement with previous works reported by Dhib et al and Jun et al [25, 26]. In their papers, according to the different carbon contents, the B area, C area, and D area were called the decarburized layer, interface layer, and carburized layer, respectively. ey believed that the formation of the decarburized layer and carburized layer was related to the carbon diffusion between the carbon steel and stainless steel in the bimetal plate
Summary
Due to its good mechanical properties and excellent corrosion resistance, type 304 austenitic stainless steel is one of the most widely utilized ferrous materials in many engineering fields [1, 2]. For stainless/carbon steel bimetal plate, the effect of element diffusion should be taken into consideration in the study of its corrosion resistance evolution. Wang et al investigated the effect of rolling reduction ratios on the microstructure, mechanical properties, and interface bonding mechanism of hot-rolled stainless steel clad plates, and they found that increasing the rolling deformation could increase the alloy element diffusion distance and the shear strength of clad plate [21]. If element diffusion occurs in the bimetal plate within the temperature range of 550–850°C, it would affect the formation of chromiumdepleted region in the stainless steel, subsequently influencing the surface corrosion resistance of the bimetal plate. Investigating the evolution of microstructure and corrosion resistance of stainless/carbon steel bimetal plate at the high-temperature condition could be helpful to improve the heat treatment process of the bimetal plate
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
