Quantitative Analysis of Hydrogen‐Assisted Microcracking in Duplex Stainless Steel through X‐Ray Refraction 3D Imaging
Quantitative Analysis of Hydrogen‐Assisted Microcracking in Duplex Stainless Steel through X‐Ray Refraction 3D Imaging
复制标题
通过 X 射线折射 3D 成像定量分析双相不锈钢中的氢辅助微裂纹
DOI：
10.1002/adem.202101287
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发表时间：
2022
影响因子：
3.6
通讯作者：
G. Bruno
中科院分区：
文献类型：
--
作者：
R. Laquai;T. Schaupp;A. Griesche;B. R. Müller;A. Kupsch;A. Hannemann;T. Kannengiesser;G. Bruno
虽然氢辅助损伤机制的识别问题已经并正在深入研究，但这种损伤的定量分析仍然缺乏合适的工具。事实上，虽然电子显微镜可以提供出色的表征，但损伤的定量分析同时需要大视场和高空间分辨率。同步加速器X射线折射技术确实具有这两个特征。在本文中，我们展示了同步加速器X射线折射计算机断层扫描（SXRCT）如何量化由贫双相钢中的氢脆引起的损伤，产生的结果甚至优于同步加速器X射线吸收计算机断层扫描所能实现的结果。正如文献中已经报道的，但这次使用的是无损技术，它表明，氢电荷不渗透到拉伸试样的中心。通过对原始试样和充氢试样的比较，可以推断出试样中的裂纹是由于轧制过程而不是氢辅助引起的。结果表明，（微）裂纹扩展从拉伸试样的表面到内部与所施加的应变增加，它是推断，一个显着的裂纹扩展只能观察到短的断裂前。
While the problem of the identification of mechanisms of hydrogen‐assisted damage has and is being thoroughly studied, the quantitative analysis of such damage still lacks suitable tools. In fact, while, for instance, electron microscopy yields excellent characterization, the quantitative analysis of damage requires at the same time large field‐of‐views and high spatial resolution. Synchrotron X‐ray refraction techniques do possess both features. Herein, it is shown how synchrotron X‐ray refraction computed tomography (SXRCT) can quantify damage induced by hydrogen embrittlement in a lean duplex steel, yielding results that overperform even those achievable by synchrotron X‐ray absorption computed tomography. As already reported in the literature, but this time using a nondestructive technique, it is shown that the hydrogen charge does not penetrate to the center of tensile specimens. By the comparison between virgin and hydrogen‐charged specimens, it is deduced that cracks in the specimen bulk are due to the rolling process rather than hydrogen‐assisted. It is shown that (micro)cracks propagate from the surface of tensile specimens to the interior with increasing applied strain, and it is deduced that a significant crack propagation can only be observed short before rupture.