简介概要

EFFECT OF Zr ADDITION TO Ti-KILLED STEEL ON INCLUSION FORMATION AND MICROSTRUCTURAL EVOLUTION IN WELDING INDUCED COARSE-GRAINED HEAT AFFECTED ZONE

来源期刊:Acta Metallurgica Sinica2008年第3期

论文作者:Z.Xu H.Su C.F.Yang Y.H.Yang Y.Q.Zhang F.Chai

Key words:Nonmetallic inclusions; Zirconium; Acicular ferrite; Coarse-grain heat affected zone (CGHAZ);

Abstract: Effects of Zirconium on the chemical component and size distribution of Ti-bearing inclusions, favored the grain refinement of the welding induced, coarse-grained heat affected zone (CGHAZ) with enhanced impact toughness in Ti-killed steels, which were examined based on experimental observations and thermodynamic calculations.It indicated that the chemical constituents of inclusions gradually varied from the TiO oxide to the Ti-O+Zr-O compound oxide and a single phase of the ZrO2 oxide,as the Zr content increased from zero to 0.0100%. A trace of Zr (0.0030%-0.0080%,depending on the oxygen content in liquid steel) provided a large amount of nucleating core for Ti oxide because of the larger specific density of ZrO2 oxide, and produced a small size distribution of the inclusions favorable for aeieular ferrite transformation with a high nucleation rate in the CGHAZ, and a high volume fraction of aeicular ferrite was obtained in the CGHAZ, with enhanced impact toughness. Otherwise, a high content of Zr (~0.0100%) produced a single phase ZrO2, which was impotent to nucleate acicular ferrite, and a microstructure composed of ferrite side plate and grain boundary ferrite developed in the CGHAZ. The experimental results were confirmed by thermodynamic calculations.

详情信息展示

EFFECT OF Zr ADDITION TO Ti-KILLED STEEL ON INCLUSION FORMATION AND MICROSTRUCTURAL EVOLUTION IN WELDING INDUCED COARSE-GRAINED HEAT AFFECTED ZONE

Z.Xu1,H.Su2,C.F.Yang2,Y.H.Yang3,Y.Q.Zhang2,F.Chai2

(1.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China;
2.Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China;
3.School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China)

Abstract:Effects of Zirconium on the chemical component and size distribution of Ti-bearing inclusions, favored the grain refinement of the welding induced, coarse-grained heat affected zone (CGHAZ) with enhanced impact toughness in Ti-killed steels, which were examined based on experimental observations and thermodynamic calculations.It indicated that the chemical constituents of inclusions gradually varied from the TiO oxide to the Ti-O+Zr-O compound oxide and a single phase of the ZrO2 oxide,as the Zr content increased from zero to 0.0100%. A trace of Zr (0.0030%-0.0080%,depending on the oxygen content in liquid steel) provided a large amount of nucleating core for Ti oxide because of the larger specific density of ZrO2 oxide, and produced a small size distribution of the inclusions favorable for aeieular ferrite transformation with a high nucleation rate in the CGHAZ, and a high volume fraction of aeicular ferrite was obtained in the CGHAZ, with enhanced impact toughness. Otherwise, a high content of Zr (~0.0100%) produced a single phase ZrO2, which was impotent to nucleate acicular ferrite, and a microstructure composed of ferrite side plate and grain boundary ferrite developed in the CGHAZ. The experimental results were confirmed by thermodynamic calculations.

Key words:Nonmetallic inclusions; Zirconium; Acicular ferrite; Coarse-grain heat affected zone (CGHAZ);

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