Influence of refining slag composition on cleanness and fatigue life of 60Si2MnA spring steel

被引：22

作者：

Hu, Y. ^{[1
]}

Chen, W. Q. ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China

来源：

IRONMAKING & STEELMAKING | 2016年 / 43卷 / 05期

关键词：

Spring steel; LF refining slag; T.[O; Inclusion; Void; Cleanness; Fatigue life; AL-KILLED STEEL; QUANTITATIVE-EVALUATION; CALCIUM TREATMENT; INCLUSIONS; STRENGTH; STRESS; SIZE;

D O I：

10.1179/1743281215Y.0000000045

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The influence of basicity and Al2O3 content of LF refining slag on T.[O] (total oxygen) as well as type, number and size of non-metallic inclusions in Al killed 60Si2MnA spring steel was investigated. The results showed that with the increase of slag basicity R(CaO/SiO2) or the decrease of Al2O3 content in slag, the T.[O], number and size of non-metallic inclusions decreased significantly. On the one hand, as the slag basicity increased, inclusions in steel were transformed from Al2O3-SiO2-CaO-MgO quaternary system to Al2O3-SiO2-CaO-MgO-CaS quinary system, which made the formation of voids between inclusions and steel matrix to decrease. Furthermore, thermodynamic calculations showed that CaS could only form in steel (R >= 3.4). Al2O3-SiO2-CaO-MgO came close to the compositions of the low melting point area, while Al2O3-SiO2-CaO-MgO-CaS deviated from this. On the other hand, as the Al2O3 content in slag increased, Al2O3-SiO2-CaO-MgO-CaS came close to the compositions of the low melting point area. In conclusion, the cleanness and fatigue life of 60Si2MnA spring steel had been improved by the increase of slag basicity or the decrease of Al2O3 content in slag.

引用

页码：340 / 350

页数：11

共 22 条

[1] Thermodynamic description of Al2O3-CaO-MnO and Al2O3-FeO-MnO melts -: a model approach [J].

Björkvall, J ;

Du, SC ;

Seetharaman, S .

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2000, 24 (03) :353-376

[2] Thermodynamic examination of inclusion modification and precipitation from calcium treatment to solidified steel [J].

Holappa, L ;

Hämäläinen, M ;

Liukkonen, M ;

Lind, M .

IRONMAKING & STEELMAKING, 2003, 30 (02) :111-115

[3]

Howard M., 1984, METALL T B, V15, P547

[4] Study on refining slags targeting high cleanliness and lower melting temperature inclusions in Al killed steel [J].

Jiang, M. ;

Wang, X. H. ;

Wang, W. J. .

IRONMAKING & STEELMAKING, 2012, 39 (01) :20-25

[5]

Kawada Y., 1971, J JPN SOC STRENGTH F, V6, P1

[6] OBSERVATION OF PRECIPITATES AND METALLOGRAPHIC GRAIN ORIENTATION IN STEEL BY A NON-AQUEOUS ELECTROLYTE-POTENTIOSTATIC ETCHING METHOD [J].

KUROSAWA, F ;

TAGUCHI, I ;

MATSUMOTO, R .

JOURNAL OF THE JAPAN INSTITUTE OF METALS, 1979, 43 (11) :1068-1077

[7]

Liu J. H., 2010, STEELMAKING CHINA, V45, P40

[8]

Ma M. J., 2014, IRONMAK STEELMAK, V41, P26

[9]

Malkiewicz T., 1963, IRON STEEL I, V1, P33

[10] THE EFFECT OF STRESS AMPLITUDE ON THE CAUSE OF FATIGUE CRACK INITIATION IN A SPRING STEEL [J].

MELANDER, A ;

LARSSON, M .

INTERNATIONAL JOURNAL OF FATIGUE, 1993, 15 (02) :119-131

← 1 2 3 →