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| Effect of Y on inclusions characteristics and tensile #br# properties in EH36 shipbuilding steel |
| ZHAO Mengjing1,2，WANG Feng1,2，XI Xiaojun1,2，YANG Shufeng1,2，LI Jingshe1,2 |
(1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing，
Beijing 100083， China；2. Beijing Key Laboratory of Special Melting and Preparation of
HighEnd Metal Materials， Beijing 100083， China) |
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Abstract Adding rare earth Y into steel can modify inclusions effectively in steel，bringing the changes of tensile properties. In order to study the effect of different content of Y on inclusions modification and tensile properties in steel，EH36 shipbuilding steel was chosen to analyze the inclusions in origin steel and in test steel with different Y addition using scanning electron microscope (SEM) and energy dispersive spectroscope (EDS). Tensile properties were also explored and tested. The results showed that rare earth Y could modify effectively the inclusions. The origin strip of MnS inclusions or the composite manganese sulfide inclusions could be modified into the spherical inclusions which the core was YAlO and the outer ring was rare earth oxysulfide. For mechanical properties，the results showed that the tensile strength and yield strength of shipbuilding steel were improved significantly with the Y addition increasing. The sample with the Y addition of 0.055% had the best morphology of inclusions modification and better tensile strength and yield strength.
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