Abstract: The exploration and exploitation of deep sea resources is currently developing rapidly. Therefore, it is required that the shipbuilding steel must possess excellent mechanical properties. The effect of Y based rare earth (RE) on the microstructure and impact toughness, especially the impact pro perties at low temperature, of E36 shipbuilding steels has been investigated. The results indicate that the microstructure of shipbuilding steels was characterized through the ferrite and pearlite. The addition of RE reduces the content of pearlite, and the pearlite appears to be degenerate state. Furthermore, the addition of RE obviously improves the impact toughness of E36 steel, especially at the low temperature. In comparison with E36 steel, the longitudinal impact energy of E36 steel containing RE is increased by 35 %, and the transverse impa ct energy is increased by 113.7 % at 60 o C. The difference of longitudinal and transverse impact properties is decreased by adding the RE.
Authors: Maolin Ye, Xiaojun Xi, Shufeng Yang, and Jingshe Li
Keywords: Y based rare earth ; impact toughness; E36 shipbuilding steel