Transient Inclusion Evolution During Modification of Alumina Inclusions by Calcium in Liquid Steel: Part II. Results and Discussion

被引：130

作者：

Verma, N. ^{[1
]}

Pistorius, Petrus C. ^{[1
]}

Fruehan, Richard J. ^{[1
]}

Potter, Michael ^{[2
]}

Lind, Minna

Story, Scott R. ^{[3
]}

机构：

[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Ctr Iron & Steelmaking Res, Pittsburgh, PA 15213 USA

[2] RJ Lee Grp, Monroeville, PA 15146 USA

[3] US Steel Corp, Res & Technol Ctr, Dept Proc Technol Steelmaking & Casting, Munhall, PA 15120 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2011年 / 42卷 / 04期

关键词：

Sulfur Content; Calcium Aluminate; Calcium Treatment; Inclusion Composition; Alumina Inclusion;

D O I：

10.1007/s11663-011-9517-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The formation of intermediate reaction products after calcium addition to aluminum-killed steel was studied. Steel samples were taken from laboratory and industrial heats before and at various times after calcium treatment. Inclusions were characterized by automated and manual scanning electron microscopy and X-ray microanalysis of polished cross sections and inclusions extracted by dissolution of the steel. Industrial and laboratory melts containing more than 40 parts per million (by mass) of dissolved sulfur showed calcium sulfide as the main reaction product after calcium injection, with calcium aluminates appearing later. It is proposed that the calcium aluminates are formed by reaction between the calcium sulfide and the alumina. A laboratory heat containing 7 parts per million of sulfur showed calcium oxide as the main initial calcium reaction product. A simple mechanism is proposed for the modification of alumina inclusions by calcium, considering transient CaO and CaS formation.

引用

页码：720 / 729

页数：10