Dong June Park, Jeonghoon Lee, Jong Han Song, Seong Ho Lee, Sang Hyun Heo, Chae Hun Lee, Nam Yong Kim, Jin Mo Lee, Taekyung Lee
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Role of Double Quenching and Tempering in Improving the Low-Temperature Impact Toughness of SA350 LF3 Steel
The low-temperature impact toughness of SA350 LF3 steel is an essential property for casks used to store and transport spent nuclear fuel. This study examined the effects of the double quenching and tempering (QQT) process on the impact toughness of SA350 LF3 steel at 163–183 K, employing a typical quenching and tempering (QT1) process and an extended austenitization (QT2) process for comparison. The microstructure, impact toughness, hardness, and tensile properties of the steel were analyzed to assess the roles of double quenching and extended austenitization in improving low-temperature toughness. Compared to QT1, QT2 marginally reduced the fracture temperature from 178 to 173 K in drop-weight impact tests. On the other hand, the QQT process did not fail at 163 K. The different degrees of improvements in the impact toughness achieved by both methods were interpreted in terms of the grain refinement, grain boundary energy, kernel average misorientation, carbide state, and the other mechanical properties.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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