Influence of different loading stresses on the peak shape of X-ray rocking curves of an austenitic-ferritic duplex stainless steel during VHCF
Influence of different loading stresses on the peak shape of X-ray rocking curves of an austenitic-ferritic duplex stainless steel during VHCF
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不同加载应力对奥氏体-铁素体双相不锈钢VHCF过程中X射线摇摆曲线峰形的影响
DOI：
10.1007/978-3-658-24531-3_7
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
U. Pietsch
中科院分区：
文献类型：
--
作者：
A. K. Hüsecken;B. Dönges;M. Söker;K. Istomin;U. Krupp;H.-J. Christ;U. Pietsch
本文研究了奥氏体铁素体双相不锈钢的X射线摇摆曲线的行为。利用超声波检测装置对平板试件进行了不同载荷幅值下的疲劳试验。在每次加载后，进行X射线衍射仪扫描，并将摇摆曲线与非疲劳状态下的摇摆曲线进行比较。这些测量是在光束线BL10的同步辐射光源Delta上进行的。由于双相不锈钢的颗粒结构，即使一次照射几个颗粒，也可以进行单颗粒分析。每个晶格面与入射光束和探测器具有正确方向的颗粒在探测器上都会产生一次布拉格反射。不同的颗粒具有不同的取向，因此反射排列在德拜-谢勒环上，两个颗粒几乎不可能具有完全相同的取向。然后，反射可以被索引为奥氏体反射或铁素体反射。比较了不同加载幅值后不同颗粒的摇摆曲线，从而可以看出单个颗粒的发展情况。摇摆曲线可能的变化有加宽、分裂、位置和强度的变化以及积分强度的变化。本研究对这些变化进行了讨论，并给出了实例。不仅奥氏体晶会受到影响，铁素体也会受到影响，但不像奥氏体受影响那么大。摇摆曲线的变化可以通过滑移带的形成、小角度晶界的变化或裂纹的萌生和扩展来解释。
The behavior of X-ray rocking curves of an austenitic-ferritic duplex stainless steel is investigated in this study. Flat samples were fatigued with different load amplitudes to certain fatigue cycles with an ultrasonic testing device. After each load amplitude X-ray diffraction scans were performed and the rocking curves were compared to the rocking curves of the unfatigued state. These measurements were performed at the synchrotron light source DELTA at beamline BL10. Due to the grain structure of the duplex stainless steel it is possible to perform a single grain analysis even if several grains are illuminated at one time. Each grain whose lattice planes have the right orientation to the incoming beam and the detector, gives a single Bragg reflection on the detector. Different grains have different orientations and so the reflections are arranged on Debye-Scherrer-Rings and it is nearly impossible for two grains to have exactly the same orientations. The reflections can then be indexed as Austenite or Ferrite reflections. The rocking curves are compared for each grain after different loading amplitudes, so the development of one grain can be seen. Possible changes of the rocking curves are broadening, splitting, change in position and intensity and also the integrated intensity. All these changes are discussed in this study and examples are given. Not only Austenite grains are affected even ferrite grains are, but not as much as Austenite is. Changes of rocking curves are explained by formation of slip bands, changes of small angle grain boundaries or initiation and propagation of cracks.
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