Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment
文献类型：期刊论文
| 作者 | L. Zhou ; G. Liu ; X. L. Ma ; K. Lu |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2008 |
| 卷号 | 56期号:1页码:78-87 |
| 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 |
| ISSN号 | 1359-6454 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/33391]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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