Processing of a low-carbon steel by equal-channel angular pressing
Processing of a low-carbon steel by equal-channel angular pressing
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DOI：
10.1016/s1359-6454(01)00441-4
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发表时间：
2002-04-02
期刊：
影响因子：
9.4
通讯作者：
Langdon, TG
中科院分区：
文献类型：
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作者：
Fukuda, Y;Oh-ishi, K;Langdon, TG
对含碳量为0.08%的低碳钢进行了等径角挤压（ECAP）工艺研究，采用B-C工艺路线，每道次试样同向旋转90 °。在室温下将样品压制通过总共三个通道。结果表明，随着应变的增加，从具有低角度的取向差的边界分离的细长的亚晶粒的阵列到由高角度边界分离的合理的等轴晶粒的阵列的微观结构的演变。三次通过后的平均晶粒尺寸接近0.2 μ m。通过ECAP处理增加了0.2%的屈服应力和极限抗拉强度（UTS），但断裂伸长率相应地降低。与早期发表的使用加工路线A（道次之间无旋转）和C（道次之间旋转180度）获得的结果的比较表明路线B-C是优选的，因为这些样品在室温下的拉伸测试中表现出广泛的应变硬化区域和合理的高伸长率。这种差异归因于当使用处理路线B-C时实现的更大的微观结构均匀性。(C)2002 Acta Materialia Inc.由爱思唯尔科技有限公司出版。保留所有权利。
A low-carbon steel containing 0.08% C was processed by Equal-Channel Angular Pressing (ECAP) with the sample rotated by 90degrees in the same direction between each pass in processing route B-C. Samples were pressed through a total of three passes at room temperature. The results reveal an evolution in the microstructure with increasing strain from an array of elongated sub-rains separated by boundaries having low angles of misorientation to an array of reasonably equiaxed grains separated by high-angle boundaries. The average grain size after three passes was similar to0.2 mum. Processing by ECAP increases the 0.2% proof stress and the ultimate tensile strength (UTS) but there is a corresponding decrease in the elongation to failure. A comparison with earlier published results obtained using processing routes A (no rotation between passes) and C (rotation of 180degrees between passes) suggests that route B-C is preferable because these samples exhibit an extensive region of strain hardening and a reasonably high elongation in tensile testing at room temperature. This difference is attributed to the greater microstructural homogeneity that is achieved when using processing route B-C. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.