NDLI: Formation Mechanism of SiO$_{2}$-Type Inclusions in Si-Mn-Killed Steel Wires Containing Limited Aluminum Content

Content Provider	Springer Nature Link
Author	Wang, Kunpeng Jiang, Min Wang, Xinhua Wang, Ying Zhao, Haoqian Cao, Zhanmin
Copyright Year	2015
Abstract	The origin, formation mechanism, and evolution of SiO$_{2}$-type inclusions in Si-Mn-killed steel wires were studied by pilot trials with systematical samplings at the refining ladle, casting tundish, as-cast bloom, reheated bloom, and hot-rolled rods. It was found that the inclusions in tundish were well controlled in the low melting point region. By contrast, MnO-SiO$_{2}$-Al$_{2}$O$_{3}$ inclusions in the as-cast bloom were with compositions located in the primary region of SiO$_{2}$, and most CaO-SiO$_{2}$-Al$_{2}$O$_{3}$-MnO inclusions lied in primary phase region of anorthite. Therefore, precipitation of SiO$_{2}$ particles in MnO-SiO$_{2}$-Al$_{2}$O$_{3}$ inclusions can be easier than in CaO-SiO$_{2}$-Al$_{2}$O$_{3}$-MnO inclusions to form dual-phase inclusions in the as-cast bloom. Thermodynamic calculation by the software FactSage 6.4 (CRCT-ThermFact Inc., Montréal, Canada) showed that mass transfer between liquid steel and inclusions resulted in the rise of SiO$_{2}$ content in inclusions from tundish to as-cast bloom and accelerated the precipitation of pure SiO$_{2}$ phase in the formed MnO-SiO$_{2}$-Al$_{2}$O$_{3}$ inclusions. As a result, the inclusions characterized by dual-phase structure of pure SiO$_{2}$ in MnO-SiO$_{2}$-Al$_{2}$O$_{3}$ matrix were observed in both as-cast and reheated blooms. Moreover, the ratio of such dual-phase SiO$_{2}$-type inclusions witnessed an obvious increase from 0 to 25.4 pct before and after casting, whereas it changed little during the reheating and rolling. Therefore, it can be reasonably concluded that they were mainly formed during casting. Comparing the evolution of the inclusions composition and morphology in as-cast bloom and rolled products, a formation mechanism of the SiO$_{2}$-type inclusions in wire rods was proposed, which included (1) precipitation of SiO$_{2}$ in the formed MnO-SiO$_{2}$-Al$_{2}$O$_{3}$ inclusion during casting and (2) solid-phase separation of the undeformed SiO$_{2}$ precipitation from its softer MnO-SiO$_{2}$-Al$_{2}$O$_{3}$ matrix during multipass rolling.
Starting Page	2198
Ending Page	2207
Page Count	10
File Format	PDF
ISSN	10735615
Journal	Metallurgical and Materials Transactions B
Volume Number	46
Issue Number	5
e-ISSN	15431916
Language	English
Publisher	Springer US
Publisher Date	2015-07-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Mechanics of Materials Condensed Matter Physics

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