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利用冲击试验、扫描电镜和透射电镜观察研究了不同稀土Ce含量对00Cr17钢冲击韧性及475℃脆性的影响。结果表明,随着钢中Ce含量的增加,00Cr17钢的横向和纵向冲击韧性均先增加后减少,在含0.02%Ce时最大。冲击韧性的改善是由于稀土Ce的加入改变了钢中非金属夹杂的形貌和类型。随着475℃时效时间的增加,不同Ce含量的00Cr17钢的冲击韧性均逐渐减小,并最终趋于零,呈现完全脆性断裂。但在475℃时效时间小于196h时,含Ce钢的冲击韧性高于不含Ce的钢,即减缓00Cr17钢的475℃脆化速度,这是由于稀土Ce的加入抑制了钢中α′相的析出。
The effects of Ce content on the impact toughness and brittleness at 475 ℃ of 00Cr17 steel were investigated by impact test, scanning electron microscopy and transmission electron microscopy. The results show that with the increase of Ce content in steel, the transverse and longitudinal impact toughness of 00Cr17 steel firstly increases and then decreases, and reaches the maximum with 0.02% Ce. Impact toughness improvement is due to the addition of rare earth Ce has changed the morphology and type of non-metallic inclusions in steel. With the aging time of 475 ℃, the impact toughness of 00Cr17 steels with different Ce contents decreased gradually, and eventually tended to be zero, showing a completely brittle fracture. However, when the aging time is less than 196h at 475 ℃, the impact toughness of Ce-containing steels is higher than that of Ce-free steels, ie, the 475 ℃ embrittlement rate of 00Cr17 steel is slowed down. This is because the addition of rare earth Ce suppresses the α ’ Precipitation.