Effect of final rolling temperature on interfacial microstructure and mechanical properties of 2205/Q345C steel clad plate

doi:10.13251/j.issn.0254-6051.2021.07.021

Abstract

Abstract: Effect of final rolling temperature on the interface microstructure, element diffusion, hardness distribution and shear strength of 2205/Q345C clad steel plates prepared by vacuum hot rolling method were studied. The results show that the interface of the clad plates are all well bonded when the final rolling temperature is in the range of 950-1100 ℃, which is composed of ferrite + pearlite at the Q345C steel side and austenite + ferrite at the 2205 steel side. Near the interface of clad plate, the C atoms diffuses from Q345C steel into 2205 steel, causing a decarburized layer formed in Q345C steel, while a “carburized layer” formed in 2205 steel, and the thicknesses of both the decarburized layer and “carburized layer” increase with the increase of the final rolling temperature. Meanwhile, the Cr and Ni atoms diffuse continuously from Q345C steel into 2205 steel, and the diffusion distance of Cr atoms is greater than that of Ni atoms. With the increase of the final rolling temperature, the diffusion distances of Cr atoms and Ni atoms increase. Also with the increase of the final rolling temperature, the hardness of the clad plate changes little, and the hardness of 2205 steel near the interface is the highest while that of Q345C steel is the lowest. At the same time, the interfacial shear strength of the clad plates decreases, but all of them are greater than 420 MPa, which conforms to the requirement of shear strength ≥210 MPa in the standard of GB/T 8165—2008 Stainless Steel Clad Plates and Strips. In conclusion, when the final rolling temperature is in the range of 950-1100 ℃, the 2205/Q345C clad plates can obtain good mechanical properties.

Key words: stainless steel clad plate, final rolling temperature, microstructure, element diffusion, mechanical properties

CLC Number:

TB33

Zhang Yongjian, Chen Junhong, Chen Zhen, Wang Jiaojiao, Hui Weijun, Wang Xiaoyong, Yang Jianwei. Effect of final rolling temperature on interfacial microstructure and mechanical properties of 2205/Q345C steel clad plate[J]. Heat Treatment of Metals, 2021, 46(7): 108-113.

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