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测定了稀土对船板的低温韧性的影响,并通过观察不同稀土含量时钢的组织及夹杂物的形貌,研究了稀土对船板钢热轧板断口形貌及对钢中夹杂物形成的影响。研究发现,加入稀土后,钢中的铁素体含量有所增加,而对其晶粒度没有明显的影响;而加入适量的稀土后(RE:0.018%~0.027%),常温下的冲击韧性下降,但在低温情况下的冲击功高于未加稀土的钢样,此时主要存在的稀土夹杂相是:RE-O-S-Ca和RE-S-Ca,而稀土元素与As形成的复合相主要出现在稀土含量较高的样品中,而当钢中稀土含量过高时会形成数量较多、颗粒较大的以氧、硫为核心的稀土、砷复合夹杂,反而会恶化钢的冲击性能。
The influence of rare earth on the low temperature toughness of ship plate was measured. By observing the microstructure and inclusions of steel with different RE content, the effect of rare earth on the fracture morphology of hot plate of ship plate and the formation of inclusions in steel influences. The results show that the ferrite content in steel increases with the addition of rare earth, but has no obvious effect on the grain size. However, the addition of the rare earth (RE: 0.018% ~ 0.027%), the impact toughness , But the impact energy at low temperature is higher than that of the non-added rare earths. In this case, the main rare earth inclusions are RE-OS-Ca and RE-S-Ca, while the complex phases of rare earth elements and As Mainly appear in the samples with higher RE content. However, when the content of rare earth in the steel is too high, a large number of rare earth and arsenic particles containing oxygen and sulfur as the core will be formed, which will worsen the impact properties of the steel .