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首页> 外文期刊>ISIJ international >Thermodynamic Analysis of Mn-depleted Zone Near Ti Oxide Inclusions for Intragranular Nucleation of Ferrite in Steel
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Thermodynamic Analysis of Mn-depleted Zone Near Ti Oxide Inclusions for Intragranular Nucleation of Ferrite in Steel

机译：钢中铁素体晶内形核过程中靠近Ti氧化物夹杂物的Mn贫化区的热力学分析

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摘要

A series of thermodynamic analyses have been performed to elucidate possible mechanism of Mn-depleted zone (MDZ) development near Ti oxide inclusions as nucleation sites of Intragranular Acicular Ferrite (IGF) transformation in steels, using a computational thermodynamic approach (CALPHAD). It is demonstrated that thermodynamic calculations are able to reproduce experimentally known inclusions evolution in the steels. The MDZ development near the Ti_2O_3 inclusions is shown to be a result of Mn absorption into the Ti_2O_3. Moreover, from thermodynamic analysis of phase equilibria in the Mn-Ti complex oxide system, it is proposed that a phase change of inclusion from (Ti_3O_5) s.s. (pseudobrookite structure solid solution dissolving Mn) to (Ti_2O_3) s.s. (ilmenite structure solid solution dissolving Mn) accelerate the Mn absorption into the Ti_2O_3 inclusion in steel. From a series of thermodynamic calculations, optimum thermal heating condition to enhance Mn absorption into Ti_2O_3 inclusions as well as IGF formation is discussed.
机译：使用计算热力学方法（CALPHAD），已进行了一系列热力学分析，以阐明Ti氧化物夹杂物附近的Mn耗尽区（MDZ）形成的可能机制，作为钢中颗粒状针状铁素体（IGF）转变的成核位点。结果表明，热力学计算能够重现实验已知的钢中夹杂物的演变。 Ti_2O_3夹杂物附近的MDZ形成是锰吸收到Ti_2O_3中的结果。此外，通过对Mn-Ti复合氧化物体系中相平衡的热力学分析，提出了从（Ti_3O_5）s.s开始的夹杂物的相变。 （将锰溶解的伪板钛矿结构固溶体）至（Ti_2O_3）s.s。 （钛铁矿结构固溶体溶解Mn）促进了Mn在钢中Ti_2O_3夹杂物中的吸收。通过一系列热力学计算，讨论了最佳热加热条件，以增强Mn吸收到Ti_2O_3夹杂物中以及形成IGF。

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