Influence of Rare Earths on Improve Impact Property of Structural Alloy Steel with Extra Low Sulfur and Oxygen
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Lin Qin Guo Feng
Key words：lanthanum; cerium; extra low sulfur and oxygen structure alloy steel; impact toughness; mechanism;
Abstract: The influence of rare earth lanthanum and cerium on impact property of structural alloy steel with extra low sulfur and oxygen was studied by impact test and microanalysis. The results showed that rare earths increased impact power of the steel when their contents were about 0.005%. Proper addition of rare earths could purify grain boundaries and decrease amount of inclusions, and reduced the possibility of crack growth along grain boundaries and through inclusions. Therefore, such steel could absorb more crack growth energy while it was impacted. However, if the content of rare earths is excessive, the grain boundary would be weakened and brittle-hard phosphates and Fe-RE intermetallic would be formed, which worsened impact toughness of steel.
Lin Qin1，Guo Feng2
(1.Physical Chemistry Department, University of Science and Technology Beijing, Beijing 100083, China;
2.College of Materials Science and engineering, Inner Mongolia University of Technology, Huhhot 010051, China)
Abstract:The influence of rare earth lanthanum and cerium on impact property of structural alloy steel with extra low sulfur and oxygen was studied by impact test and microanalysis. The results showed that rare earths increased impact power of the steel when their contents were about 0.005%. Proper addition of rare earths could purify grain boundaries and decrease amount of inclusions, and reduced the possibility of crack growth along grain boundaries and through inclusions. Therefore, such steel could absorb more crack growth energy while it was impacted. However, if the content of rare earths is excessive, the grain boundary would be weakened and brittle-hard phosphates and Fe-RE intermetallic would be formed, which worsened impact toughness of steel.
Key words:lanthanum; cerium; extra low sulfur and oxygen structure alloy steel; impact toughness; mechanism;
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