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运用扫描电镜及能谱等分析手段研究了钇基稀土对E36钢中夹杂物的变质作用以及对显微组织和冲击性能的影响.研究表明,钇基稀土改善了E36钢的显微组织,减少了珠光体的片间距和含量.加入钇基稀土后,E36钢的冲击断口由典型的解理断口变为准解理+韧窝型断口,韧窝中细小球状的稀土夹杂是其转变的主要原因.加入少量的钇基稀土显著改善了E36钢的冲击韧性,尤其是低温冲击性能.在-60℃情况下,E36Re钢的纵向冲击功较E36钢提高了33.5%,横向冲击功提高了113.7%.并且,钇基稀土显著改善了E36钢纵横向冲击性能的差异性,未加稀土E36钢的纵、横冲击比均大于1.70,-60℃条件下达到2.77,而E36Re钢的纵、横冲击比为1.51~1.73.
The effect of yttrium-based rare earth on the inclusions in E36 steel and its effect on the microstructure and impact properties were studied by means of SEM and EDS. The results show that the yttrium-based rare earth improves the microstructure of E36 steel and reduces The pearlite spacing and content.After adding yttrium-based rare earth, the impact fracture of E36 steel changed from typical cleavage fracture to quasi-cleavage + dimple fracture, and the rare earth spheroid inclusions in dimples were the main change The reason is that the addition of a small amount of yttrium-based rare earth significantly improves the impact toughness of E36 steel, especially the low-temperature impact properties. The longitudinal impact energy of E36Re steel is increased by 33.5% and the impact energy at horizontal direction is increased by 113.5 at -60 ° C %. Moreover, the yttrium-based rare earth significantly improved the longitudinal and transverse impact performance of E36 steel, the impact of longitudinal and horizontal impact ratio of rare earth E36 steel are greater than 1.70, -60 ℃ conditions to reach 2.77, while E36Re steel vertical and horizontal Impact ratio of 1.51 ~ 1.73.