Precipitation of carbonitrides and their strengthening upon non-quench aging for micro-alloyed acicular ferrite pipeline steels

IMR OpenIR

	Precipitation of carbonitrides and their strengthening upon non-quench aging for micro-alloyed acicular ferrite pipeline steels
	M. C. Zhao; T. Hanamura; H. Qiu; K. Yang
	2005
发表期刊	Materials Transactions
ISSN	1345-9678
卷号	46 期号:4 页码:784-789
摘要	A non-quench aging (reheating hot-rolled plates to 600&DEG; C for isothermal aging), different from the conventional quench aging (quench followed by temper), was carried Out to improve the strength level for acicular ferrite (AF) pipeline steels, while their impact energies and ductilities did not decrease obviously, and the Charpy impact fracture appearances were similar between the as-rolled and the aged samples, showing the ductile dimple rupture over the whole fracture surface. The strengthening was ascribed to the further additional precipitation of microalloyed carbonitrides, and the little degradation of ductile and toughness is believed to relate to both the tempering of martensite in martensite/austenite (M/A) islands and the improvement of microstructural uniformity upon the non-quench aging. The nucleation and strengthening of the carbonitrides in the Current non-quench aging were hypothetically calculated with the present mathematical modes and hypothesis based on the thermodynamic consideration and Orowan looping mechanism, which was somewhat consistent with the present experiment, indicating that the strengthening mechanism of the present AF pipeline steels by the current non-quench aging evidently resulted from the additional precipitation of carbonitrides in ferrite region of approximately 600&DEG; C.
部门归属	natl inst mat sci, steel res ctr, tsukuba, ibaraki, japan. chinese acad sci, inst met res, shenyang, peoples r china.;zhao, mc (reprint author), natl inst mat sci, steel res ctr, tsukuba, ibaraki, japan;mczhao@imr.ac.cn
关键词	Pipeline Steel Non-quench Aging Mechanical Property Carbonitride Toughness
URL	查看原文
WOS记录号	WOS:000229601900007
引用统计	被引频次：6[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/321006/35267
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. C. Zhao,T. Hanamura,H. Qiu,et al. Precipitation of carbonitrides and their strengthening upon non-quench aging for micro-alloyed acicular ferrite pipeline steels[J]. Materials Transactions,2005,46(4):784-789.
APA	M. C. Zhao,T. Hanamura,H. Qiu,&K. Yang.(2005).Precipitation of carbonitrides and their strengthening upon non-quench aging for micro-alloyed acicular ferrite pipeline steels.Materials Transactions,46(4),784-789.
MLA	M. C. Zhao,et al."Precipitation of carbonitrides and their strengthening upon non-quench aging for micro-alloyed acicular ferrite pipeline steels".Materials Transactions 46.4(2005):784-789.