首页|Effect of Al content on modification behavior of non-metallic inclusions in high-strength steel treated with rare earth
Effect of Al content on modification behavior of non-metallic inclusions in high-strength steel treated with rare earth
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The influence of Al content(0.0053,0.0171,and 0.0578 wt.％)on the modification behavior of non-metallic inclusions in 20CrMoVTiB steel treated with rare earth elements was studied through high-temperature experiments and thermodynamic simulation.The results showed that the modification products varied with the Al content in steel under 0.01 wt.％of Ce addition.The formation sequence of typical rare earth inclusions in steel with the increase in Al content was Ce2O3 →CeAlO3 → CeAl11O18,and the final stable products were highly Al content dependent.When the Al content was 0.0053 wt.％,the stable phase in steel was Ce2O3;while the[Al]reached 0.0171 wt.％,the stable phase became CeAlO3.As the Al content reached 0.0578 wt.％,CeAl11O18 became the stable phase.As a result,increasing the Al content could inhibit the precipitation of Ce2O3 inclusions in steel while promote the formation of CeAlO3 and CeAl11O18 inclusions.In addition,both Ca treatment and Ce treatment could effectively refine the size of inclusions in steel by changing their types.However,the feeding amount of Ca wire into molten steel should be appropriately reduced under the condition of adding Ce simultaneously,which is expected to be beneficial for an improved Ce treatment effect.
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