Tensile properties and work hardening behaviors of ultrafine grained carbon steel and pure iron processed by warm high pressure torsion
Tensile properties and work hardening behaviors of ultrafine grained carbon steel and pure iron processed by warm high pressure torsion
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DOI：
10.1016/j.msea.2013.05.008
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发表时间：
2013-10
期刊：
影响因子：
6.4
通讯作者：
J. Ning;Eglantine Courtois-Manara;L. Kurmanaeva;A. Ganeev;R. Valiev;C. Kübel;Y. Ivanisenko
中科院分区：
文献类型：
--
作者：
J. Ning;Eglantine Courtois-Manara;L. Kurmanaeva;A. Ganeev;R. Valiev;C. Kübel;Y. Ivanisenko
使用TEM中的自动晶体取向映射（ACOM），我们已经表明在350 ° C下高压扭转（HPT）后，C45钢和Armco铁中形成了主要（> 90%）具有大角度晶界的超细晶粒（UFG）结构。UFG C45钢表现出高的抗拉强度和延展性的组合，并且与类似处理的Armco铁相比，其机械性能显著改善。热处理后C45钢的高强度是由于热变形引起的晶粒细化、铁素体颗粒高度破碎所致。两种材料韧性的差异与其微观组织特征不同而产生的不同加工硬化行为有关。
Using automated crystal-orientation mapping (ACOM) in TEM, we have shown the formation of an ultrafine grained (UFG) structure with predominantly (>90%) high angle grain boundaries in C45 steel and Armco iron after high pressure torsion (HPT) at 350 °C. The UFG C45 steel exhibits a combination of high tensile strength and ductility and its mechanical properties were improved significantly compared to the analogously processed Armco iron. The higher strength of the processed C45 steel is attributed to the finer grain size, the highly fragmented cementite particles induced by the HPT deformation. The difference in ductility of the two materials is related to the distinct work hardening behaviors due to the different microstructural characteristics.