通过热力学计算研究稀土Ce夹杂物在高铁扣件弹簧钢中生成的热力学条件,并分析加入稀土Ce对Al2O3夹杂的变质作用及条件.由稀土Ce硫化物、氧化物和氧硫化物的标准吉布斯生成自由能构建了稀土Ce夹杂物的空间析出图,并将其应用在预测高铁扣件弹簧钢中加入稀土Ce后夹杂物的生成顺序,并确定其存在形式及热力学转换条件.计算结果表明:钢液中加入稀土最容易生成的是CeAlO3夹杂,其次是Ce2O2S;在本计算所用钢种的氧活度和硫活度分别为0.000639和0.005845的条件下,钢液中首先会析出Ce2O2S;当钢液中Al含量为0.013%时,稀土变质Al2O3夹杂的理论加入量为0.0019%.
@@@@Thermodynamic condition of rare earth cerium inclusion formed in spring steel used in fastener of high-speed railway was studied by the thermodynamic calculation. In addition, the effect and condition of rare earth cerium on modifying Al2O3 inclusion were analyzed. Through the standard Gibbs free energies of formation of the sulfides, oxides and oxysulfides of cerium, the precipitation diagram in space was built. And it was applied to predict the sequence of rare earth inclusion formed the spring steel. Finally, the ultimate state of rare earth inclusions and their thermodynamic transformation condition were determined. The computation results show that the most easily formed inclusion is CeAlO3 when rare earth element Ce is added to the molten steel, with Ce2O2S following. In this work, when the activities of oxygen and sulfur in the steel are 0.000 639 and 0.005 845, respectively, the first precipitated inclusion is Ce2O2S. Moreover, when the aluminum content in the steel is 0.013%, the theoretic amount of added rare earth Ce is 0.0019%, which can realize Al2O3 deformation.
参考文献
| [1] | KIESSLING R;NORDBERG H.Influence of inclusions on mechanical properties of steel[A].London:The Iron and Steel Institute,1972:179-185. |
| [2] | LANKFORD J .Effect of oxide inclusions on fatigue failure[J].International Metals Reviews,1977,22(01):221-228. |
| [3] | FRUEHAN R J .The effect of zirconium,cerium,and lanthanum on the solubility of oxygen in liquid iron[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1974,5(02):345-347. |
| [4] | WILSON W G;KAY D;VAHED A .The use of thermodynamics and phase equilibria to predict the behavior of the rare earth elements in steel[J].Journal of Metals,1975,26(05):14-23. |
| [5] | FISCHER W A;BERTRAM H .The deoxidation,desulphurization and nitrogen removal of iron melts containing oxygen,sulfur or nitrogen using the rare earth metals cerium and lanthanum[J].Arch Eisenhutten News,1973,44:87-95. |
| [6] | HAN Q;FENG X;LIU S;NIU H TANG Z .Equilibria between cerium or neodymium and oxygen in molten iron[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1990,21(02):295-302. |
| [7] | LANGENBERG F C;CHIPMAN J .Equilibrium between cerium and sulfur in liquid iron[J].Transactions of the Metallurgical Society of ALME,1958,212:290-293. |
| [8] | 李文超 .钢中稀土夹杂物生成的热力学规律[J].钢铁,1986,21(03):7-12. |
| [9] | A. Katsumata;H. Todoroki .Effect of Rare Earth Metal on Inclusion Composition in Molten Stainless Steel[J].Iron & Steelmaker,2002(7):51-57. |
| [10] | FARRAR J;DOLBY R E .Sulfide inclusions in steel[J].ASM,1975,6(02):252-268. |
| [11] | Garrison, WM;Maloney, JL .Lanthanum additions and the toughness of ultra-high strength steels and the determination of appropriate lanthanum additions[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,2005(1-2):299-310. |
| [12] | Liu Yonghua,Lin Qin,Ye Wen,Chen Ning,Guo Ying,Chen Zhuqing,Zhu Qinghe.Behavior of Rare Earths in Ultra-Low-Sulfur Microalloyed Steel[J].稀土学报（英文版）,1999(03):207-212. |
| [13] | Lin Qin,Guo Feng,Zhu Xingyuan.Behaviors of Lanthanum and Cerium on Grain Boundaries in Carbon Manganese Clean Steel[J].稀土学报（英文版）,2007(04):485-489. |
| [14] | Guo Feng,Lin Qin.Existing Forms of Lanthanum in Purity Steels[J].稀土学报（英文版）,2006(z2):405-408. |
| [15] | SAMANTA S K;MITRA S K;Pal T K .Effect of rare earth elements on microstructure and oxidation behavior in TIG weldments of AISI 316L stainless steel[J].Materials Science and Engineering A,2006,430(01):242-247. |
| [16] | Chen X;Li YX .Fracture toughness improvement of austempered high silicon steel by titanium, vanadium and rare earth elements modification[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):298-305. |
| [17] | 王龙妹,杜挺,卢先利,乐可襄.微量稀土元素在钢中的作用机理及应用研究[J].稀土,2001(04):37-40. |
| [18] | 王龙妹,杜挺,卢先利,李正邦,盖玉春.稀土元素在钢中的热力学参数及应用[J].中国稀土学报,2003(03):251-254. |
| [19] | 陈家祥.炼钢常用图表数据手册[M].北京:冶金工业出版社,2010:757-761. |
| [20] | VAHED A;KAYD A R .Thermodynamics of rare earths in steelmaking[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1976,7(03):375-383. |
| [21] | S.Diao;Q.Han .Equilibria of Ce-Al-O and Nd-Al-O in molten iron[J].Steel Research,1997(11):469-474. |
| [22] | HIRATA H;ISOBE K .Steel having finely dispersed inclusions[P].US,0157162,2006-07-20. |
| [23] | 杨晓红,吴鹏飞,吴钺川,成国光.特殊钢中稀土变质夹杂物行为研究[J].中国稀土学报,2010(05):612-618. |
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