Thermodynamic Analysis on Precipitation of Nonmetallic Inclusions in Gear Steel

被引：1
|
作者：
Chen, Yong [1 ]
Chen, Tianming [1 ]
Wang, Xinhua [1 ]
Chen, Jun [1 ]
机构：
[1] Pangang Grp Res Inst Co Ltd, Chengdu 611731, Sichuan, Peoples R China
来源：
MATERIALS AND DESIGN, PTS 1-3 | 2011年 / 284-286卷
关键词：
gear steel; nonmetallic inclusions; precipitation; thermodynamic analysis; DEOXIDATION EQUILIBRIA; OXYGEN EQUILIBRIUM; ALUMINUM; IRON;
D O I：
10.4028/www.scientific.net/AMR.284-286.1060
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In order to make nonmetallic inclusions with low melting point and improve the fatigue resistance of gear steel, thermodynamic analysis on precipitation of nonmetallic inclusions CaO(MgO)-Al2O3 system was investigated in this paper. The complex deoxidation equilibria of strong deoxidizing elements such as aluminum, calcium, magnesium and so on were calculated accurately with the second order and middle term of the activity coefficient expression. Thermodynamic conditions for the precipitation of spinel inclusion (MgO center dot Al2O3) is sufficient as the acid-soluble aluminum content is 0.04% and magnesium content is less than 0.0005% in the tested gear steel 20CrMoH. The relationship between precipitation of spinel and calcium aluminate inclusions in gear steel and the composition of molten steel at 1873K indicates that, the compositions of inclusions before and after calcium treatment are C(12)A(7) and C(3)A respectively, while the reactions in ladle reach the equilibrium state.
引用
收藏
页码：1060 / 1066
页数：7
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