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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Relationship Between Solidification Microstructure and Hot Cracking Susceptibility for Continuous Casting of Low-Carbon and High-Strength Low-Alloyed Steels: A Phase-Field Study
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Relationship Between Solidification Microstructure and Hot Cracking Susceptibility for Continuous Casting of Low-Carbon and High-Strength Low-Alloyed Steels: A Phase-Field Study

机译：低碳高强度低合金钢连铸凝固组织与热裂敏感性的关系：相场研究

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摘要

Hot cracking is one of the major defects in continuous casting of steels, frequently limiting the productivity. To understand the factors leading to this defect, microstructure formation is simulated for a low-carbon and two high-strength low-alloyed steels. 2D simulation of the initial stage of solidification is performed in a moving slice of the slab using proprietary multiphase-field software and taking into account all elements which are expected to have a relevant effect on the mechanical properties and structure formation during solidification. To account for the correct thermodynamic and kinetic properties of the multicomponent alloy grades, the simu lation software is online coupled to commercial thermodynamic and mobility databases. A moving-frame boundary condition allows traveling through the entire solidification history starting from the slab surface, and tracking the morphology changes during growth of the shell. From the simulation results, significant microstructure differences between the steel grades are quantitatively evaluated and correlated with their hot cracking behavior according to the Rappaz-Drezet-Gremaud (RDG) hot cracking criterion. The possible role of the microalloying elements in hot cracking, in particular of traces of Ti, is analyzed. With the assumption that TiN precipitates trigger coalescence of the primary dendrites, quantitative evaluation of the critical strain rates leads to a full agreement with the observed hot cracking behavior.
机译：热裂化是钢连续铸造的主要缺陷之一，经常会限制生产率。为了了解导致该缺陷的因素，对低碳钢和两种高强度低合金钢的微观组织形成进行了模拟。凝固初始阶段的2D模拟是使用专有的多相场软件在平板的移动切片中进行的，并考虑了所有可能对凝固过程中的机械性能和结构形成有相关影响的元素。为了说明多组分合金牌号的正确热力学和动力学特性，将模拟软件在线耦合到商业热力学和迁移率数据库。运动框架边界条件允许从板坯表面开始遍历整个凝固过程，并跟踪壳生长过程中的形态变化。根据模拟结果，根据Rappaz-Drezet-Gremaud（RDG）热裂化准则，定量评估了钢种之间显着的显微组织差异并将其与热裂化行为相关联。分析了微合金元素在热裂解中的可能作用，特别是痕量的Ti。假设TiN沉淀物会触发初级枝晶的聚结，对临界应变率的定量评估会导致与观察到的热裂化行为完全吻合。

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