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采用光学显微镜、带能谱的扫描电子显微镜等分析技术观察了不同冷速下La脱氧钢的显微组织,并绘制了静态连续冷却转变图.实验结果发现,在4~10℃·s-1的冷速范围内,钢中会有大量晶内铁素体形成,其中在8℃·s-1冷却时可以获得大量细小且弥散分布的晶内针状铁素体.La脱氧钢中含La夹杂物与α-Fe相有较低错配度,其中La2O2S夹杂物与α-Fe相的晶格错配度最小为0.2%,钢中含La夹杂物均可诱导晶内针状铁素体形核并可促进感生形核,进而细化组织.
The microstructure of La deoxidized steel under different cooling rates was observed by optical microscope and energy dispersive scanning electron microscope, and the static continuous cooling transformation diagram was drawn.It was found that at 4 ~ 10 ℃ · s-1 , A large amount of intragranular ferrite is formed in the steel, and a large amount of fine and dispersed intragranular acicular ferrite can be obtained at 8 ℃ · s-1 cooling.La deoxidized steel contains La The inclusions have a lower degree of mismatch with the α-Fe phase, in which the lattice mismatch between the La 2 O 2S inclusions and the α-Fe phase is at least 0.2%. The inclusion of La inclusions in the steel can induce intragranular acicular ferrite Nuclear and can promote the nucleation, thereby refining the organization.