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Formation and Evolution of Inclusions in High Chromium Steel
ISIJ International ( IF 1.8 ) Pub Date : 2021-09-15 , DOI: 10.2355/isijinternational.isijint-2021-078
Yoshihiko Higuchi 1 , Hideki Ono 2 , Katsuyoshi Okumoto 3
Affiliation  

Controlling inclusion content in high chromium steel is very important to prevent submerged entry nozzle from clogging in continuous casting and avoid the negative impacts of inclusions on steel properties. Therefore, effects of temperature and content of elements on phase stability diagram should be clarified in chromium bearing steel. However, the effect of chromium content on boundaries of MgO, MgO∙Al2O3 and Al2O3 in phase stability diagram are much different among the researchers. The direction of boundaries shift is affected by chromium content differently. Temperature dependencies of deoxidation equilibrium constants below 1873 K are also scattered. Calcium, which is used to avoid the negative effect of MgO∙Al2O3 inclusion, enlarges liquid region in phase stability diagram. However, the region replaced by liquid oxide is understood differently in low alloyed steel and high chromium steel. In TiOX–Al2O3–MgO system inclusion, commercial thermochemical software predicts that boundaries of Ti2O3, Ti3O5, Al2O3 and TiOx–Al2O3 shift toward lower titanium content in high chromium steel. However, the calculated phase stability diagrams vary among studies even in liquid iron or low alloyed steel. Therefore, equilibrium experiments under various conditions and reliable technique of thermodynamic calculation with high accuracy are desired.



中文翻译:

高铬钢夹杂物的形成与演化

控制高铬钢中的夹杂物含量对于防止连铸时浸入式水口堵塞,避免夹杂物对钢的性能产生负面影响非常重要。因此,在含铬钢中应明确温度和元素含量对相稳定性图的影响。然而,铬含量对相稳定性图中MgO、MgO∙Al 2 O 3和Al 2 O 3边界的影响因研究人员而异。边界移动的方向受铬含量的影响不同。低于 1873 K 的脱氧平衡常数的温度依赖性也很分散。钙,用于避免 MgO∙Al 2的负面影响O 3夹杂物,扩大了相稳定性图中的液相区域。然而,在低合金钢和高铬钢中,对被液态氧化物取代的区域有不同的理解。在 TiO X –Al 2 O 3 –MgO 系统夹杂物中,商业热化学软件预测 Ti 2 O 3、Ti 3 O 5、Al 2 O 3和 TiOx–Al 2 O 3 的边界向高铬钢中较低的钛含量转变。然而,即使在铁水或低合金钢中,计算出的相稳定性图也会因研究而异。因此,需要各种条件下的平衡实验和可靠的高精度热力学计算技术。

更新日期:2021-09-15
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