Advanced high-strength steels (AHSSs) have been applied to the automobile industry due to the advantages of low energy consumption and high safety. The non-reactive CaO–Al₂O₃-based mold fluxes with low/no SiO₂ content have been proposed for developing the efficient casting technology of sustainable AHSSs, due to the occurrence of the reaction between AHSSs and conventional CaO–SiO₂-based mold flux. Then, the effects of (CaO + BaO)/Al₂O₃ ratio on the melting, crystallization, and melt structure of a designed non-reactive CaO–Al₂O₃-10 wt% SiO₂-based mold flux system have been studied. Results suggested that a higher (CaO + BaO)/Al₂O₃ ratio would lower the melting temperatures of the mold fluxes, and the slag system showed a good thermal stability during the melting process with the evaporation less than 5.10%. Besides, the crystallization behavior was promoted with the increase of (CaO + BaO)/Al₂O₃ ratio, which is associated with the reduction of the polymerization degree of the melt structure, because of the high polymerization degree of Q²(Si) structural units, and the symmetric and asymmetric [AlO₄]⁵⁻-tetrahedral structures were destroyed by the released O²⁻ ions. Thus, the migration resistance of ions and atom groups was reduced, and then the growth kinetics of LiAlO₂ and Ca₂SiO₄ crystals were improved. When 7.42 wt% BaO was added to Sample D with (CaO + BaO)/Al₂O₃ ratio at 1.75, the crystallization was promoted with the decomposition of melt structure, and the Ba-bearing phase of Ba₃Al₂O₆ crystal was precipitated to replace the main crystalline phase of LiAlO₂ due to the tight junction of Ba²⁺ and [AlO₄]⁵⁻ for compensating the Al³⁺ charge.

Graphical Abstract

中文翻译：

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（CaO + BaO）/ Al 2 O 3比率对高级高强度钢中CaO–Al 2 O 3 -10 wt％SiO 2基铸模助熔剂的熔融，结晶和熔体结构的影响

先进的高强度钢（AHSSs）由于具有低能耗和高安全性的优点而被应用于汽车工业。非反应性的CaO-Al系_2个ö ₃具有低基模渣/无的SiO ₂含量已经提出了用于发展可持续AHSSs的高效铸造技术，由于AHSSs和常规的CaO-的SiO之间的反应的发生₂ -基脱模剂。然后，（CaO + BaO）/ Al ₂ O _3的比例对设计的非反应性CaO–Al ₂ O ₃ -10 wt％SiO ₂的熔融，结晶和熔融结构的影响基于模型的助焊剂系统已被研究。结果表明，较高的（CaO + BaO）/ Al ₂ O ₃比会降低铸模助熔剂的熔融温度，并且渣系统在熔融过程中表现出良好的热稳定性，且蒸发量小于5.10％。此外，由于Q ²（Si）的高聚合度，随着（CaO + BaO）/ Al ₂ O ₃比的增加，结晶行为得到了促进，这与熔融结构的聚合度的降低有关。结构单元，对称的和不对称的[AlO ₄ ] ^5-四面体结构被释放的O ^2-破坏离子。因此，降低了离子和原子基团的迁移阻力，然后改善了LiAlO ₂和Ca ₂ SiO ₄晶体的生长动力学。当以（CaO + BaO）/ Al ₂ O ₃比为1.75向样品D中添加7.42 wt％BaO时，熔融结构的分解促进了结晶，Ba ₃ Al ₂ O ₆晶体的Ba承载相由于Ba ²⁺和[AlO ₄ ] ⁵⁻的紧密连接，Al沉淀析出以取代LiAlO ₂的主晶相，以补偿Al ^3+的电荷。

图形概要