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Transformation of Inclusions in a Complicated‐Deoxidized Heavy Rail Steels During Heating
Steel Research International ( IF 1.9 ) Pub Date : 2020-06-02 , DOI: 10.1002/srin.202000120 Yuexin Zhang 1 , Lifeng Zhang 2 , Yanping Chu 3 , Qiang Ren 1 , Jujin Wang 1 , Nan Liu 1, 4 , Zhiyong Chen 4 , Jianguo Zhi 4
Steel Research International ( IF 1.9 ) Pub Date : 2020-06-02 , DOI: 10.1002/srin.202000120 Yuexin Zhang 1 , Lifeng Zhang 2 , Yanping Chu 3 , Qiang Ren 1 , Jujin Wang 1 , Nan Liu 1, 4 , Zhiyong Chen 4 , Jianguo Zhi 4
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The transformation of inclusions in a heavy rail steel during heating is investigated in laboratory experiments. When the steel is heated at 1000–1300 °C, inclusions of CaO–SiO2–Al2O3–MgO are transformed into CaS–MgO·Al2O3 ones and the contents of CaS and Al2O3 in inclusions increase, whereas those of CaO and SiO2 decrease. When the steel is heated at 1400 °C, the MgO·Al2O3 phase in inclusions precipitates, whereas CaS, CaO, and SiO2 still exist, which is caused by the lower thermodynamic driving force at high temperature. With the holding time increasing from 0 to 7 h, the composition of inclusions tends to the equilibrium value which is predicted using Factsage. The transformation phenomenon is validated using thermodynamic analysis and a kinetic model is established to predict the composition of inclusions during heating. The MgO·Al2O3 phase formed in inclusions in the steel during heating results in an exposure of MgO·Al2O3 spinel inclusions after rolling, which are rigid and harmful to the performance of steel rails.
中文翻译：
复杂脱氧重轨钢加热过程中夹杂物的转变
在实验室实验中研究了加热过程中重型钢轨中夹杂物的转变。当钢在1000–1300°C加热时，CaO-SiO 2 -Al 2 O 3 -MgO夹杂物转变为CaS-MgO·Al 2 O 3夹杂物，并且夹杂物中CaS和Al 2 O 3的含量增加，而CaO和SiO 2减少。将钢加热到1400°C时，夹杂物中的MgO·Al 2 O 3相析出，而CaS，CaO和SiO 2仍然存在，这是由于高温下较低的热力学驱动力引起的。随着保持时间从0小时增加到7小时，夹杂物的组成趋于达到使用Factsage预测的平衡值。使用热力学分析验证了相变现象，并建立了动力学模型以预测加热过程中夹杂物的组成。加热期间在钢中的夹杂物中形成的MgO·Al 2 O 3相导致轧制后暴露出MgO·Al 2 O 3尖晶石夹杂物，这些夹杂物是刚性的并且对钢轨的性能有害。
更新日期：2020-06-02
中文翻译：
复杂脱氧重轨钢加热过程中夹杂物的转变
在实验室实验中研究了加热过程中重型钢轨中夹杂物的转变。当钢在1000–1300°C加热时，CaO-SiO 2 -Al 2 O 3 -MgO夹杂物转变为CaS-MgO·Al 2 O 3夹杂物，并且夹杂物中CaS和Al 2 O 3的含量增加，而CaO和SiO 2减少。将钢加热到1400°C时，夹杂物中的MgO·Al 2 O 3相析出，而CaS，CaO和SiO 2仍然存在，这是由于高温下较低的热力学驱动力引起的。随着保持时间从0小时增加到7小时，夹杂物的组成趋于达到使用Factsage预测的平衡值。使用热力学分析验证了相变现象，并建立了动力学模型以预测加热过程中夹杂物的组成。加热期间在钢中的夹杂物中形成的MgO·Al 2 O 3相导致轧制后暴露出MgO·Al 2 O 3尖晶石夹杂物，这些夹杂物是刚性的并且对钢轨的性能有害。
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