Effect of TiN inclusions on the impact toughness of low-carbon microalloyed steels

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	Effect of TiN inclusions on the impact toughness of low-carbon microalloyed steels
	W. Yan; Y. Y. Shan; K. Yang
	2006
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	37A 期号:7 页码:2147-2158
摘要	Microalloying with various elements, including titanium, coupled with thermomechanically controlled processing, has become a major technology for the manufacture of high-quality steel plate. In this research, the influence of TiN inclusions on the impact toughness of low-carbon plate steels microalloyed with titanium, vanadium, and boron was investigated. The three experimental steels had Ti/N ratios of 2.44, 3.5, and 4.2, and all three had a granular bainite microstructure. However, Charpy V-notch testing showed that steel A had very high toughness at both room temperature and -20 degrees C, whereas steels B and C showed very low toughness at -20 degrees C and moderate toughness at room temperature. Scanning electron microscope fractography revealed that coarse TiN inclusions had acted as cleavage fracture initiation sites in steels B and C. The effect of Ti and N levels on TiN formation and growth is analyzed using alloy thermodynamics. It is shown that not only is the Ti/N ratio important, but also the product of total Ti and N plays a most important role in TiN formation and growth. It is concluded that the product of the total Ti and N contents should not be greater than the solubility product of TiN at the solidus temperature to prevent the precipitation of TiN particles before solidification. Furthermore, the ratio of Ti to N should also be maintained lower than the stoichiometric ratio of 3.42 to ensure a low coarsening rate for the TiN inclusions during soaking before rolling.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china.;yan, w (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;weiyan@imr.ac.cn
关键词	Heat-affected Zone Cleavage Fracture Brittle-fracture Forging Steels Initiation Microstructure Deformation Titanium Ferrite
URL	查看原文
WOS记录号	WOS:000238808900013
引用统计	被引频次：118[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34635
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Yan,Y. Y. Shan,K. Yang. Effect of TiN inclusions on the impact toughness of low-carbon microalloyed steels[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2006,37A(7):2147-2158.
APA	W. Yan,Y. Y. Shan,&K. Yang.(2006).Effect of TiN inclusions on the impact toughness of low-carbon microalloyed steels.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,37A(7),2147-2158.
MLA	W. Yan,et al."Effect of TiN inclusions on the impact toughness of low-carbon microalloyed steels".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 37A.7(2006):2147-2158.