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研究Al预脱氧对Ce处理钢夹杂物和显微组织的影响,利用热力学计算、带能谱的扫描电镜和DIL805A热膨胀仪检测进行了对比研究。得到如下结论:Ce处理后钢中的主要夹杂物从MnS转变为Ce2O2S+MnS,Al脱氧能使Ce处理钢中夹杂物转变为CeAlO3+Ce2S3+MnS。Ce处理C-Mn钢连续冷却过程有利于获得晶内铁素体的冷速为2~8℃/s。Al脱氧能改变诱导晶内铁素体形核的核心夹杂物种类,诱导铁素体形核的能力降低,且Al能够使Ce处理钢连续冷却组织转变(CCT)曲线向左上方移动,促进铁素体在晶界形核,不利于Ce处理后晶内铁素体的形成。Al脱氧Ce处理C-Mn钢在冷速为2~5℃/s时,由于夹杂物核心成分的改变与Al合金化作用导致晶内铁素体含量较未用Al脱氧Ce处理钢少。
The effects of Al pre-deoxidation on the inclusions and microstructures of Ce-treated steel were studied. The thermodynamic calculation, SEM with EDS and DIL805A thermal dilatometer were used to study the effects of Al pre-deoxidation on Ce. It is concluded that the main inclusions in the steel after the Ce treatment change from MnS to Ce2O2S + MnS, and the deoxidation of Al can transform the inclusions into CeAlO3 + Ce2S3 + MnS in the Ce treated steel. Ce treatment of C-Mn steel continuous cooling process is conducive to obtaining intragranular ferrite cooling rate of 2 ~ 8 ℃ / s. Al deoxidation can change the types of core inclusions induced by intragranular ferrite nucleation and reduce the ability of inducing ferrite nucleation, and Al can make the Ce-treated steel continuously cool the transformation of the structure (CCT) curve to move to the upper left and promote the ferrite In the grain boundary nucleation, is not conducive to the formation of intragranular ferrite after Ce treatment. Al deoxidation Ce treatment of C-Mn steel at a cooling rate of 2 ~ 5 ℃ / s, due to changes in the core composition of inclusions and Al alloying caused intragranular ferrite content than the Al-deoxidized Ce steel less.