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首页> 外文期刊>ISIJ international >Characterization of Dislocation Evolution in Cyclically Loaded Austenitic and Ferritic Stainless Steels via XRD Line-profile Analysis
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Characterization of Dislocation Evolution in Cyclically Loaded Austenitic and Ferritic Stainless Steels via XRD Line-profile Analysis

机译：XRD线形分析法表征循环加载奥氏体和铁素体不锈钢中的位错演化

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摘要

Dislocations in austenitic and ferritic stainless steels (SSs) under cyclic loading were quantitatively evaluated via X-ray diffraction line-profile analysis to determine the relationship between the dislocation density and low-cycle fatigue (LCF) life in both SSs. The dislocation density of the austenitic and ferritic SSs varied linearly with respect to the LCF life in a double-logarithmic graph, with different slopes of the line. The dislocation density normalized by the maximum work hardening for both SSs exhibited a log-log linear relationship with the LCF life. The fraction of screw dislocations in the ferritic SS decreased with decreasing LCF life owing to the easy cross-slip of dislocations. Because of the difficulty of the cross-slip of dislocations in the austenitic SS, the fraction of screw dislocations remained almost constant throughout the LCF life. Analysis of the crystallite size and the dislocation arrangement with respect to the dislocation density under tensile and cyclic loading revealed that the dislocation arrangement for cyclic loading was smaller than that for tensile loading. Thus, the dislocation arrangement was related to the cyclic loading. In the plot of the dislocation evolution versus the number of cycles, two stages were observed in the variation of the dislocation characteristics for both SSs. In the first stage, the dislocation density increased, and the crystallite size decreased. The dislocation arrangement parameter of the ferritic and austenitic SS decreased and remained the same, respectively, in the first stage. In the second stage, the dislocation density, dislocation arrangement parameter, and crystallite size remained constant.
机译：通过X射线衍射线轮廓分析定量评估了循环载荷下奥氏体和铁素体不锈钢（SSs）中的位错，以确定两种SS中位错密度与低周疲劳（LCF）寿命之间的关系。在双对数图中，奥氏体和铁素体不锈钢的位错密度相对于LCF寿命线性变化，且线的斜率不同。通过对两个不锈钢的最大加工硬化归一化的位错密度与LCF寿命呈对数对数线性关系。由于容易错位错位，铁素体不锈钢中的螺钉错位的比例随着LCF寿命的降低而降低。由于在奥氏体不锈钢中错位交叉滑动的困难，在整个LCF寿命中，螺钉错位的比例几乎保持恒定。对在拉伸和循环载荷下的微晶尺寸和位错排列相对于位错密度的分析表明，循环载荷的位错排列小于拉伸载荷下的位错排列。因此，位错布置与循环载荷有关。在位错演化与循环数的关系图中，两个SS的位错特性变化都观察到两个阶段。在第一阶段，位错密度增加，微晶尺寸减小。在第一阶段，铁素体和奥氏体不锈钢的位错排列参数分别减小并保持不变。在第二阶段中，位错密度，位错排列参数和微晶尺寸保持恒定。

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