Formation mechanism of nanostructures in austenitic stainless steel during equal channel angular pressing
Formation mechanism of nanostructures in austenitic stainless steel during equal channel angular pressing
复制标题
奥氏体不锈钢等通道角挤压过程中纳米结构的形成机制
DOI：
10.1080/14786430701594046
复制
发表时间：
2007-09
影响因子：
1.6
通讯作者：
Deng, B.
中科院分区：
文献类型：
--
作者：
Yang, G.;Zhang, Z. F.;Li, S. X.;Huang, C. X.;Wu, S. D.;Deng, B.
采用等通道转角挤压（ECAP）工艺，在室温下对一种超低碳奥氏体不锈钢进行了1 ~ 8道次的挤压。利用X射线衍射、光学显微镜和透射电子显微镜研究了ECAP变形过程中的微观结构演变，揭示了应变诱导纳米结构的形成机理。细化机制包括剪切带和形变孪晶的形成、孪晶层的破碎以及由微米级到纳米级的奥氏体晶粒通过γ（fcc）→ ε（hcp）→ α′（bcc）的连续马氏体转变。经过8道次的挤压，获得了两种类型的纳米晶粒：（a）平均晶粒尺寸为~ 31 nm的纳米晶奥氏体和（B）平均晶粒尺寸为~ 74 nm的应变诱导纳米晶α′马氏体。从形变孪晶和马氏体相变的显微组织细分角度讨论了其形成机制。
An ultra-low carbon austenitic stainless steel was successfully pressed from one to eight passes by equal channel angular pressing (ECAP) at room temperature. By using X-ray diffraction, optical microscopy and transmission electron microscopy, the microstructural evolution during ECAP was investigated to reveal the formation mechanism of strain-induced nanostructures. The refinement mechanism involved the formation of shear bands and deformation twins, followed by the fragmentation of twin lamellae, as well as successive martensite transformation from parent austenitic grains with sizes ranging from microns to nanometres through the processes γ(fcc) → ε(hcp) → α′(bcc). After pressing for eight passes, two types of nanocrystalline grains were achieved: (a) nanocrystalline austenite with a mean grain size of ∼31 nm and (b) strain-induced nanocrystalline α′-martensite with a size of ∼74 nm. The formation mechanisms are discussed in terms of microstructural subdivision via deformation twinning and martensite transformation.
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DOI：
10.1007/s11661-003-0209-7
发表时间：
2003
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
B. Han;F. Mohamed;E. Lavernia
通讯作者：
B. Han;F. Mohamed;E. Lavernia
影响因子：
56.9
作者：
Shan, ZW;Stach, EA;Mao, SX
通讯作者：
Mao, SX
影响因子：
4
作者：
Yinmin M Wang;E. Ma
通讯作者：
Yinmin M Wang;E. Ma
DOI：
10.1016/0921-5093(95)09705-8
发表时间：
1995-07-01
影响因子：
6.4
作者：
SEGAL, VM
通讯作者：
SEGAL, VM
影响因子：
2.7
作者：
Valiev, RZ;Alexandrov, IV;Lowe, TC
通讯作者：
Lowe, TC