In situ neutron diffraction study of the microstructure and tensile deformation behavior in Al-added high manganese austenitic steels
In situ neutron diffraction study of the microstructure and tensile deformation behavior in Al-added high manganese austenitic steels
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DOI：
10.1016/j.actamat.2011.12.043
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发表时间：
2012-03-01
期刊：
影响因子：
9.4
通讯作者：
Koo, Y. M.
中科院分区：
文献类型：
--
作者：
Jeong, J. S.;Woo, W.;Koo, Y. M.
利用中子衍射原位实验研究了不同Al含量（0，1.5，2.0，3.0 wt.%）的高锰奥氏体钢的拉伸变形行为。在塑性区观察到衍射峰的位移、展宽和不对称性的显著变化。衍射峰形分析被施加到确定微观结构参数，如堆垛层错/孪晶故障的概率，位错密度和堆垛层错能（SFE）。这些参数与拉伸变形过程中的屈服强度、锯齿状流动和应变硬化率定量相关。主要结果表明，随着Al的加入，孪晶/层错几率从0.05降低到0.01，位错密度从10（16）降低到4 × 10（15）m（-2），而SFE（γ）从20增加到45 mJ m（-2），γ = 8.84 wt.% Al + 19.0 mJ m（-2）。这些微结构参数也与电子背散射方法获得的取向差和图形质量图的结果吻合得很好。(C)2012 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
In situ neutron diffraction experiments were performed to measure the tensile deformation behavior of high manganese austenitic steels with different Al contents (0, 1.5, 2.0, 3.0 wt.%). Significant variations of peak shift, broadening and asymmetry of the diffraction peaks were observed in the plastic region with the measurement. Diffraction peak profile analysis was applied to determine microstructural parameters such as stacking/twinning fault probabilities, dislocation density and stacking fault energy (SFE). These parameters are quantitatively correlated to the yield strength, serrated flow and strain hardening rate during tensile deformation. The main results showed that the twin/stacking fault probability considerably decreases from 0.05 to 0.01 and dislocation density from 10(16) to 4 x 10(15) m(-2) as a function of Al addition, while SFE (gamma) increases from 20 to 45 mJ m(-2) with the relationship of gamma = 8.84 wt.% Al + 19.0 mJ m(-2). Such microstructural parameters are also in good agreement with the results of the misorientation and pattern quality map obtained by the electron backscatter method. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.