Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment

IMR OpenIR

	Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment
	L. Zhou; G. Liu; X. L. Ma; K. Lu
	2008
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	56 期号:1 页码:78-87
摘要	Steel with spheroidal cementite particles dispersed in a ferrite matrix was subjected to surface mechanical attrition treatment. Strain-induced microstructure evolution, including grain refinement of ferrite and cementite as well as dissolution of cementite, was examined using transmission electron microscopy. Upon straining, dense dislocation walls were developed in ferrite grains, which evolved gradually into sub-boundaries and highly misoriented grain boundaries (GB) at increasing strains, leading to grain refinement of the ferrite. The ferrite refinement process is greatly facilitated by the presence of dispersed cementite particles, as the cementite/ferrite interfaces are effective nucleation sites for dislocations and also barriers for dislocation motions. When ferrite grains are refined to sizes smaller than that of cementite particles, plastic deformation occurs in cementite particles, characterized by edge dislocation gliding along the I I 10) and I 10 0) planes. Dislocation gliding in cementite is initiated at intersections of the cementite/ferrite interfaces and ferrite GB. Accumulated multiple gliding progressively refines cementite into nano-sized cementite particles mixed within ferrite nano-grains in the top surface layer. A decreasing volume fraction of cementite is observed with decreasing depth in the top deformed layer, indicative of dissolution of cementite induced by increased plastic straining. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[zhou, l.; liu, g.; ma, x. l.; lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;lu, k (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;lu@imr.ac.cn
关键词	Steel With Spheroidal Cementite Nanocrystalline Material Grain Refinement Cementite Dissolution Dislocation Gliding Induced Grain-refinement Coarse 2nd-phase Particles Pearlitic Steel Plastic-deformation Nanocrystalline Ferrite Nanostructure Formation Nanometer-scale Dissolution Microstructures Decomposition
URL	查看原文
WOS记录号	WOS:000251847200010
引用统计	被引频次：162[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/321006/33391
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Zhou,G. Liu,X. L. Ma,et al. Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment[J]. Acta Materialia,2008,56(1):78-87.
APA	L. Zhou,G. Liu,X. L. Ma,&K. Lu.(2008).Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment.Acta Materialia,56(1),78-87.
MLA	L. Zhou,et al."Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment".Acta Materialia 56.1(2008):78-87.