Performance Evaluation of 316L-Q345R Stainless Steel Clad Plate
JIN He-rong1,2, YANG Xu-kun3, YI Ya-li3
1. Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education, Yanshan University, Qinhuangdao 066004, Hebei, China;
2. Parallel Robot and Mechatronic System Laboratory of Hebei Province, Yanshan University, Qinhuangdao 066004, Hebei, China;
3. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China
Abstract：Performance of 316L-Q345R stainless steel clad plate prepared by vacuum hot-rolling was evaluated from two aspects of the microstructure and micro-hardness. Microstructure topography and constituent of clad plate were investigated by scanning electron microscope and energy spectrum analysis, and changing rules of phase structure and constituent were also studied. Relationship between microstructure and hardness was studied by testing the hardness of interface between stainless steel and carbon steel through hardness tester. The results indicate that, after vacuum hot-rolling, the microstructure of Q345R is mainly composed of ferrite and pearlite. The microstructure of 316L is single austenite, and part of grain is twin state. The clad plate compounds well after vacuum hot rolling, and the interface between stainless steel and carbon steel is straight. Elements diffuse into both sides of the interface. Cr and Ni diffuse from stainless steel into the low alloy steel and form a rich Cr/Ni layer in the interface, and C migrates from the low alloy steel into stainless steel. The hardness of clad plate is larger at the composite interface. The hardness away from the interface is closed to that of Q345R steel in Q345R steel side, while from the interface to stainless steel, the hardness reduces and then increases until it reaches a stable value.
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2016, Vol. 44 
