摘要
为了深入研究与控制SWRS82B钢中氧化铝夹杂,针对添加稀土元素铈研究其对氧化铝的改性问题,通过热力学以及边-边匹配模型对稀土夹杂物的析出条件和Al2O3与稀土氧(硫)化物之间、γ-Fe和稀土氧(硫)化物之间的原子间错配度进行计算,探究稀土铈夹杂物作为Al2O3和γ-Fe异质形核的有效性,进而证明稀土铈元素对B类氧化铝夹杂物改性的有效性,提高钢材性能。计算结果表明,在0~2000K的温度区间上,生成CeAlO3夹杂物反应的吉布斯自由能最低,且在同等条件下铈氧(硫)化物生成的可能性偏低,稀土铈氧(硫)化物可以作为Al2O3异质形核的核心,且稀土铈氧(硫)化物可以作为γ-Fe异质形核的核心;Al2O3可在稀土铈氧(硫)化物上有效形核,且Al2O3优先在Ce2O2S上发生异质形核;γ-Fe可在Al2O3和稀土铈氧(硫)化物上有效形核,且γ-Fe优先在Al2O3上发生异质形核,使得形状不规则的氧化铝夹杂物转变为近球形的铈铝酸盐夹杂,揭示SWRS82B钢中非金属夹杂物的变性机理,为提高SWRS82B钢中脆性夹杂物转变为塑性夹杂物处理的实际效果提供理论依据。
In order to further study and control the alumina inclusions in SWRS82B steel,the modification of alumina with rare earth element cerium was studied.The thermodynamics and edge-edge matching model were used to calculate the precipitation conditions of rare earth inclusions and the degree of interatomic mismatch between Al2O3 and rare earth oxygen(sulfide)compounds,and betweenγ-Fe and rare earth oxygen(sulfide)compounds,which investigate the effectiveness of rare earth cerium inclusions as heterogeneous nucleation of Al2O3 andγ-Fe,and further prove the effectiveness of rare earth cerium elements to modify B-type alumina inclusions and improve the properties of steel.The calculation results show that in the temperature range from 0 to 2000 K,the Gibbs free energy for the reaction to generate CeAlO3 inclusions is the lowest,and the possibility of cerium oxide(sulfide)formation is low under the same conditions,and the rare earth cerium oxide(sulfur)compound can be used as the core of heterogeneous nucleation of Al2O3,and the rare earth cerium oxy(sulfide)compound can be used as the core of heterogeneous nucleation ofγ-Fe;Al2O3 can effectively nucleate on the rare earth cerium oxide(sulfide)compound,and Al2O3 is preferentially heterogeneous nucleation occurs on Ce2O2S;γ-Fe can effectively nucleate on Al2O3 and rare earth cerium(sulfide)compounds,andγ-Fe preferentially nucleates on Al2O3,causing irregularly shaped alumina inclusions to transform into near-spherical cerium aluminate inclusions,revealing the mechanism of non-metallic inclusions in SWRS82B steel to degenerate.The actual effect of plastic inclusion treatment provides a theoretical basis.
作者
王奕
李长荣
曾泽芸
席作冰
WANG Yi;LI Chang-rong;ZENG Ze-yun;XI Zuo-bing(School of Materials and Metallurgy,Guizhou University,Guiyang 550025,Guizhou,China;Guizhou Key Laboratory of Metallurgical Engineering and Process Energy Conservation,Guiyang 550025,Guizhou,China)
出处
《钢铁》
CAS
CSCD
北大核心
2020年第10期69-74,88,共7页
Iron and Steel
基金
国家自然科学基金资助项目(51864013)。
关键词
SWRS82B钢
热力学
稀土夹杂物
错配度
晶体学
SWRS82B steel
thermodynamics
rare earth inclusion
mismatch degree
crystallography
