Microstructural evolution in a commercial low carbon steel by equal channel angular pressing
Microstructural evolution in a commercial low carbon steel by equal channel angular pressing
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DOI：
10.1016/s1359-6454(00)00028-8
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发表时间：
2000-05
期刊：
影响因子：
9.4
通讯作者：
D. Shin;Byung Cheol Kim;Yong-Seog Kim;Kyung-Tae Park
中科院分区：
文献类型：
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作者：
D. Shin;Byung Cheol Kim;Yong-Seog Kim;Kyung-Tae Park
在本研究中，研究了具有铁素体和珠光体混合结构的普通低碳钢在等通道角挤压过程中的宏观和微观微观结构变化。在等通道角挤压过程中，样品在通道之间绕其纵轴旋转 180°。通过重复压制直至累积有效应变为~4，获得了亚微米尺寸为0.2-0.3μm的铁素体晶粒。光学观察表明，在目前的等通道角挤压条件下，由于珠光体渗碳体具有相当大的塑性变形能力，硬珠光体相以与软铁素体相类似的方式宏观变形。通过透射电子显微镜检查显微照片表明，铁素体相的微观结构变化与单相铝固溶体合金中的微观结构变化相似，观察到晶界的非平衡构型。在珠光体相中，渗碳体片状片的形貌变化表现为存在相互平行的严重颈缩碎片或卷曲的波状碎片。通过将普通低碳钢经等通道角挤压后的显微组织演变与等通道角挤压铝固溶合金和重冷拉珠光体钢丝进行比较来讨论，后者表现出类似的显微组织变化。
In the present investigation, both macroscopic and microscopic microstructural changes in a plain low carbon steel with a mixed structure of ferrite and pearlite were examined during equal channel angular pressing . During equal channel angular pressing, the sample was rotated 180°around its longitudinal axis between the passages. By repeating the pressing up to the accumulated effective strain of ∼4, ferrite grains with a submicron size of 0.2–0.3 μm were obtained. Optical observation revealed that hard pearlite phase deformed macroscopically in a similar manner to soft ferrite phase due to a considerable capability of pearlitic cementite for plastic deformation under the present equal channel angular pressing conditions. An examination of micrographs taken by transmission electron microscopy showed that the microstructural change in ferrite phase was similar to those in single phase Al solid solution alloys in that the non-equilibrium configurations of grain boundary were observed. In pearlite phase, the morphological change of cementite lamellar plates was represented by the existence of either severely necked fragments parallel to each other or curled wavy fragments. Microstructural evolution in a plain low carbon steel subjected to equal channel angular pressing was discussed by comparing it to that of equal channel angular pressed Al solid solution alloys and heavily cold drawn pearlitic steel wire, which exhibited similar microstructural change.