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Formation and Evolution of Inclusions in High Chromium Steel

机译：高铬钢中夹杂物的形成与演化

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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?Al_(2)O_(3) and Al_(2)O_(3) 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?Al_(2)O_(3) 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 TiO_(X)–Al_(2)O_(3)–MgO system inclusion, commercial thermochemical software predicts that boundaries of Ti_(2)O_(3), Ti_(3)O_(5), Al_(2)O_(3) and TiOx–Al_(2)O_(3) 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.
机译：控制高铬钢中的包涵含量非常重要，无法防止浸没式进入喷嘴在连续铸造中堵塞，避免夹杂物对钢质性能的负面影响。因此，在铬轴承钢中应澄清温度和元素含量对相位稳定性图的影响。然而，铬含量对MgO的边界的影响，MgO？AL_（2）O_（3）和Al_（2）O_（3）在研究人员之间存在多大差异。边界移位的方向不同地受铬含量的影响。在1873 k以下的脱氧平衡常数的温度依赖性也分散。钙，用于避免MgO的负面影响？AL_（2）O_（3）夹杂物，扩大相位稳定性图中的液态区域。然而，由液体氧化物代替的区域以低合金钢和高铬钢的不同方式理解。在TIO_（x）-al_（2）O_（3）-MGO系统包含时，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）在高铬钢中朝向较低的钛含量转变。然而，计算出的相位稳定性图在即使在液态铁或低合金钢中也会变化。因此，期望在各种条件下的平衡实验和高精度的热力学计算的可靠技术。

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