Effect of Zr addition on toughness and microstructure of coarse grained heat affected zone in Al deoxidised low carbon steel

被引:7
作者
Li, X. B. [1 ]
Min, Y. [1 ]
Liu, C. J. [1 ]
Jiang, M. F. [1 ]
机构
[1] Northeastern Univ, Sch Met & Mat, Minist Educ, Key Lab Ecol Met Multimetall Mineral, Shenyang 110819, Peoples R China
基金
中国国家自然科学基金;
关键词
Al deoxidised low carbon steel; Zirconium; Precipitate; Coarse grained heat affected zone (CGHAZ); Intragranular ferrite; ACICULAR FERRITE; NONMETALLIC INCLUSIONS; C-MN; ZIRCONIUM; ALLOY; NUCLEATION; BEHAVIOR;
D O I
10.1179/1743284715Y.0000000144
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of Zr addition on the toughness and microstructure of coarse grained heat affected zone (CGHAZ) in Al deoxidised low carbon steel was investigated. In this present work, the specimens (Zr free and Zr added) were subjected to weld thermal cycle with heat input of 54, 80 and 100 kJ cm(-1) at 1350 degrees C peak temperature using thermal simulator. The typical inclusions were characterised by scanning electron microscopy, and the chemical composition of the inclusions was determined by energy dispersive spectroscopy. The nanoscale precipitates were analysed by transmission electron microscopy and energy dispersive spectroscopy. It was verified that the occurrence of Zr in steel mostly exists in the form of oxide inclusions, but a few in the form of solid solution state and Zr containing precipitates when the concentration of Zr is 0.015%. The improvement of CGHAZ toughness is obtained when the heat input is 80-100 kJ cm(-1). The possible reasons about the effects of Zr on the toughness of CGHAZ, including Zr containing inclusions, precipitates and microstructure characteristics, were also discussed.
引用
收藏
页码:507 / 515
页数:9
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