Influence of TiN inclusions on the cleavage fracture behavior of low-carbon microalloyed steels

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	Influence of TiN inclusions on the cleavage fracture behavior of low-carbon microalloyed steels
	W. Yan; Y. Y. Shan; K. Yang
	2007
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	38A 期号:6 页码:1211-1222
摘要	Toughness is a major concern for low-carbon microalloyed steels. In this work, the impact fracture behavior of two low-carbon Ti-V microalloyed steels was investigated in order to better understand the role of TiN inclusions in the toughness of the steels. The steels had similar chemical compositions and were manufactured by the same rolling process. However, there was an obvious difference in the ductile brittle transition temperature (DBTT) in the Charpy V-notch (CVN) impact tests of the two steels; one (steel 1) possessing a DBTT below -20 degrees C, while the DBTT of the other (steel 2) was above 15 degrees C. Scanning electron microscopy (SEM) fractography revealed that there were TIN inclusions at the cleavage fracture initiation sites on the fracture surfaces of steel 2 at both low and room temperatures. It is shown that the TiN inclusions had nucleated on Al2O3 particles and that they had pre-existing interior flaws. A high density of TiN inclusions was found in steel 2, but there was a much lower density in steel 1. Analysis indicates that these inclusions were responsible for the shift of DBTT to a higher temperature in steel 2. A mechanism is proposed for understanding the effect of the size and density of TiN inclusions on the fracture behavior, and the cleavage fracture initiation process is analyzed in terms of the distribution and development of stresses ahead of the notch tip during fracture at both low and room temperatures.
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;yyshan@imr.ac.cn
关键词	Low-alloy Steel Pearlitic Eutectoid Steel C-mn Steel Brittle-fracture Forging Steels Pipeline Steel Grain-size Toughness Stress Mechanism
URL	查看原文
WOS记录号	WOS:000248187200009
引用统计	被引频次：61[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/321006/33965
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. Influence of TiN inclusions on the cleavage fracture behavior of low-carbon microalloyed steels[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2007,38A(6):1211-1222.
APA	W. Yan,Y. Y. Shan,&K. Yang.(2007).Influence of TiN inclusions on the cleavage fracture behavior of low-carbon microalloyed steels.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,38A(6),1211-1222.
MLA	W. Yan,et al."Influence of TiN inclusions on the cleavage fracture behavior of low-carbon microalloyed steels".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 38A.6(2007):1211-1222.