| The stainless steel composite plate has better performance,which makes the stainless steel composite plate have great development prospects in bridge construction,petrochemical industry,home decoration and so on.In this study,the stainless composite plate are made of cladding 316 L stainless steel and Q370 qE carbon steel.They have the advantages of good corrosion resistance of 316 L stainless steel and lower production cost of carbon steel Q370 qE.Rolled composite is a more commonly used composite method,but because the stress will be generated during the rolling process to affect the performance of the composite plate,it is necessary to heat treat the composite plate.In this paper,metallographic microscope and scanning electron microscope(SEM)were used to observe the structural changes and element diffusion of the bonding surface of the sample after different heat treatment temperatures.The composite plate samples were tested for microhardness,shear strength,tensile properties,and impact properties,and the weight loss experiments and electrochemical methods were used to test the corrosion resistance of the sample interface.The microstructure of the 316 L side is austenite,and the Q370 qE side is mainly composed of pearlite and ferrite.As the heat treatment temperature increases,the grains tend to grow.Chromium carbide precipitated at the grain boundary of the sample and the "heat-sensitive zone".The hardness values of the heat-treated samples are highest at the interface,and the hardness values gradually decrease when they are far away from the interface.The hardness value at the interface increases first and then decreases as the heat treatment temperature increases.This is due to the strengthening and Soften interactions.The minimum shear strength of the sample is 385 MPa,which is greater than national standards and requirements for practical use.When the heat treatment temperature is 400 ° C,1000 ° C and 1100 ° C,the impact energy does not meet the national standards. |
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