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Effects of (CaO + BaO)/Al 2 O 3 Ratio on the Melting, Crystallization, and Melt Structure of CaO–Al 2 O 3 -10 wt% SiO 2 -Based Mold Fluxes for Advanced High-Strength Steels
Journal of Sustainable Metallurgy ( IF 2.5 ) Pub Date : 2021-04-15 , DOI: 10.1007/s40831-021-00358-y
Lei Zhang , Bingyu Zhai , Wanlin Wang , Il Sohn

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:

(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

更新日期:2021-04-15
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