Abstract：To investigate the effects of different Al-Ce alloys on cerium-containing and titanium-containing inclusions in titanium microalloyed steel, the size, quantity, morphology, and type of inclusions in steel were analyzed using a scanning electron microscope, energy dispersive spectroscope, and OTS inclusion automatic analysis system. The Equilib and Phase Diagram modules in FactSage 8.1 thermodynamic software were used to calculate the precipitation of inclusions in steel at different temperatures. The thermodynamic calculation results show that CeAlO3is mainly formed in molten steel, while Ce2S3 and Ce2O2S are precipitated during the solidification of molten steel. When the mass percent of cerium is 0.005%, with the mass percent of sulfur increasing from 0.000 8% to 0.003 3%, the type of rare earth inclusions will gradually change from CeAlO3, Ce2S3, and Ce2O2S to single Ce2S3. The experimental results show that when Al-Ce alloys (w(Ce)∶w(Al)=4.5∶1, 8.5∶1, and 11.5∶1) are added to the steel successively, the content of sulfur will gradually decrease, the typical cerium-containing inclusions in steel are Ce2S3, Ce-Al-O-S and Ce2O2S-CeAlO3, the morphology is mainly ellipsoidal and spherical, and the average size of rare-earth inclusions increases from 3 μm to 5.5 μm, the size of Al2O3 and Ti(C, N) in steel with rare earth alloys is reduced compared with the steel without rare earth alloys. The possibility of CeN transition between Ce-Al-O-S inclusions and TiN is verified based on the two-dimensional mismatch degree model and the surface scanning results of Ce-Al-O-S-Ti(C, N) inclusions. In the steel smelted with the alloy of w(Ce)∶w(Al)=11.5∶1, CeAlO3 precipitates in the form of dendrites on the surface of Ce2O2S. The edge-to-edge matching model proves that Ce2O2S can become the nucleation core of CeAlO3, and there are four possible orientation relationships between Ce2O2S and CeAlO3. Individual Ti(C, N) in steel has two growth models,continuous growth and two-dimensional nucleation, when Ti(C, N) nucleates and grows on the surface of different rare earth inclusions for a certain period, its final growth characteristics are the same, it takes rare earth inclusions as the heterogeneous nucleation core, and grows in a cubic structure along its surface in all directions.
何飞虎, 彭军, 张芳, 常宏涛. Al-Ce合金对铝脱氧钛微合金钢中夹杂物的影响[J]. 钢铁, 2023, 58(3): 61-72.
HE Fei-hu, PENG Jun, ZHANG Fang, CHANG Hong-tao. Effect of Al-Ce alloy on inclusions in Al deoxidization titanium microalloyed steel[J]. Iron and Steel, 2023, 58(3): 61-72.
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2023, Vol. 58 
