In situ diffraction characterization on microstructure evolution in austenitic stainless steel during cyclic plastic deformation and its relation to the mechanical response
In situ diffraction characterization on microstructure evolution in austenitic stainless steel during cyclic plastic deformation and its relation to the mechanical response
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奥氏体不锈钢循环塑性变形过程中微观组织演变的原位衍射表征及其与机械响应的关系
DOI：
10.1016/j.msea.2021.141582
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Harjo Stefanus
中科院分区：
文献类型：
--
作者：
Kumagai Masayoshi;Akita Koichi;Kuroda Masatoshi;Harjo Stefanus
进行衍射线轮廓分析以定性地评估奥氏体不锈钢在250次塑性变形循环期间的微观结构的变化。位错密度随着循环次数的增加而增加，直到50次循环，但此后下降。对应于该最大点的循环数根据其是否被评估为总位错密度或被解卷积为刃位错密度和螺位错密度而不同。在初始状态下，刃型位错占主导地位，然而，螺型位错大大增加，在循环加载的第一阶段。之后，刃位错形成胞壁，螺位错湮灭。达到奇点的周期数取决于位错结构的发展。当胞状结构发展和胞壁变尖时，位错的平均排列减少，晶粒尺寸增加。奥氏体相的流变应力有增有减，反映了循环加载过程中位错密度的变化。而在α-马氏体生成后，随着循环次数的增加，相变马氏体对总流变应力的贡献增大。
Diffraction line profile analysis was performed to qualitatively evaluate the change in the microstructure of austenitic stainless steel during 250 cycles of plastic deformation. The dislocation density increased with increasing number of cycles until 50 cycles but thereafter decreased. The cycle number corresponding to this maximum point differed depending on whether it was evaluated as the total dislocation density or was deconvoluted into edge and screw dislocation densities. At the initial state, edge dislocations were predominant; however, screw dislocations greatly increased at the first stage of cyclic loading. Afterwards, edge dislocations formed cell walls and screw dislocations annihilated. The cycle number at which the singularity was reached depended on the development of the dislocation structure. When the cell structure developed and the cell wall became sharp, the arrangement of dislocations on average decreased and the crystallite size increased. The flow stress of the austenite phase increased and decreased, reflecting the dislocation density during cyclic loading. However, after αʹ-martensite was generated as the number of cycles increased, the contribution of the transformed martensite to the total flow stress could increase.
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