Formation, microstructure and development of the localized shear deformation in low-carbon steels
文献类型：期刊论文
| 作者 | Xu YB; Bai YL(白以龙) ; Xue Q; Shen LT(沈乐天)
|
| 刊名 | Acta Materialia
 |
| 出版日期 | 1996 |
| 卷号 | 44期号:5页码:1917-1926 |
| 关键词 | High-Strain Rates Adiabatic Shear Band Formation Instability Flow |
| ISSN号 | 1359-6454 |
| 通讯作者 | Xu, YB (reprint author), CHINESE ACAD SCI,INST MET RES,STATE KEY LAB FATIGUE & FRACTURE MAT,SHENYANG 110015,PEOPLES R CHINA. |
| 中文摘要 | An investigation has been made into the effect of microstructural parameters on the propensity for forming shear localization produced during high speed torsional testing by split Hopkinson bar with different average rates of 610, 650 and 1500 s(-1) in low carbon steels. These steels received the quenched, quenched and tempered as well as normalized treatments that provide wide microstructural parameters and mechanical properties. The results indicate that the occurrence of the shear localization is susceptible to the strength of the steels. In other words, the tendency of the quenched steel to form a shear band is higher than that of the other two steels. It is also found that there is a critical strain at which the shear localization occurs in the steels. The critical strain value is strongly dependent on the strength of the steels. Before arriving at this point, the material undergoes a slow work-hardening. After this point, the material suffers work-softening, corresponding to a process during which the deformation is gradually localized and eventually becomes spatially correlated to form a macroscopic shear band. Examinations by SEM reveal that the shear localization within the band involves a series of sequential crystallographic and non-crystallographic events including the change in crystal orientation, misorientation, generation and even perhaps damage in microstructures such as the initiation, growth and coalescence of the microcracks. It is expected that the sharp drop in the load-carrying capacity is associated with the growth and coalescence of the microcracks rather than the occurrence of the shear localization, but the shear localization is seen to accelerate the growth and coalescence of the microcracks. The thin foil observations by TEM reveal that the density of dislocations in the band is extremely high and the tangled arrangement and cell structure of dislocations tends to align along the shear direction. The multiplication and interaction of dislocations seems to be responsible for work-hardening of the steels. The avalanche of the dislocation cells corresponds to the sharp drop in shear stress at which the deformed specimen is broken. Double shear bands and kink bands are also observed in the present study. The principal band develops first and its width is narrower than that of the secondary band. |
| 类目[WOS] | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 研究领域[WOS] | Materials Science ; Metallurgy & Metallurgical Engineering |
| 关键词[WOS] | HIGH-STRAIN RATES ; ADIABATIC SHEAR ; BAND FORMATION ; INSTABILITY ; FLOW |
| 收录类别 | SCI ; EI |
| 语种 | 英语 |
| WOS记录号 | WOS:A1996UF04600018 |
| 公开日期 | 2009-08-03 ; 2010-08-20 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/39144]  |
| 专题 | 力学研究所_力学所知识产出(1956-2008) |
| 推荐引用方式 GB/T 7714 | Xu YB,Bai YL,Xue Q,et al. Formation, microstructure and development of the localized shear deformation in low-carbon steels[J]. Acta Materialia,1996,44(5):1917-1926. |
| APA | Xu YB,白以龙,Xue Q,&沈乐天.(1996).Formation, microstructure and development of the localized shear deformation in low-carbon steels.Acta Materialia,44(5),1917-1926. |
| MLA | Xu YB,et al."Formation, microstructure and development of the localized shear deformation in low-carbon steels".Acta Materialia 44.5(1996):1917-1926. |
入库方式： OAI收割
来源：力学研究所
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