Strain rate sensitivity of nanocrystalline and ultrafine-grained steel obtained by mechanical attrition
Strain rate sensitivity of nanocrystalline and ultrafine-grained steel obtained by mechanical attrition
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DOI：
10.1016/j.msea.2007.10.041
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发表时间：
2008-06
期刊：
影响因子：
6.4
通讯作者：
R. Rodríguez-Baracaldo;J. A. Benito;J. Caro;J. Cabrera;J. Prado
中科院分区：
文献类型：
--
作者：
R. Rodríguez-Baracaldo;J. A. Benito;J. Caro;J. Cabrera;J. Prado
用球磨铁粉通过温固结工艺制备了具有纳米晶和超细晶铁素体晶粒尺寸的0.55%C钢的高致密块状试样。研究了不同晶粒尺寸下的显微组织、力学性能和应变速率敏感性参数。发现随着晶粒尺寸在超细范围内减小，m不断减小。相反，在纳米晶制度中，随着晶粒尺寸减小，观察到m略微增加。
High dense bulk specimens of 0.55% C steel with ferritic grain sizes within the nanocrystalline and ultrafine regimes have been produced from ball-milled iron powder through the warm consolidation process. The microstructure, the mechanical properties and the strain rate sensitivity parameter (m) were investigated for the different grain sizes obtained. A constant decrease of m was found as the grain size decreases within the ultrafine regime. In the nanocrystalline regime, on the contrary, as the grain size decreases a slight increase of m was observed.