|About this Abstract
||Liquid Metal Processing & Casting Conference (LMPC 2019)
||Liquid Metal Processing & Casting
||Effect of Yttrium on the Microstructure and Mechanical Properties of an Austenitic Hot-Work Tool Steel
||Chengbin Shi, Yongfeng Qi, Jing Li, Lan Peng
|On-Site Speaker (Planned)
The microstructure and mechanical properties of high-Mn austenitic die steel with yttrium addition were investigated with the help of optional microscope (OM), scanning electron microscope (SEM) and electron back scattered diffraction (EBSD). The microsegregation of alloying elements were analyzed by electron probe microanalysis (EPMA). The results showed that the microstructure were refined and mechanical properties were improved when the amount of soluble yttrium in as-cast ingot reached to 60×106. The secondary dendritic arm spacings and corresponding the size of primary carbides were reduced with increasing yttrium addition up to 60×106, but increased when excessive yttrium addition. The grain sizes decreased with increasing yttrium addition after heat treatment. The intragranular twin grain boundaries were increased with increasing yttrium addition, which resulted in the increasing in grain boundaries area ratio. Therefore, the strength and toughness of the steel were simultaneously increased due to the refined grains, reduced carbides and impeded movement dislocation.
||Definite: At-meeting proceedings