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Digital Image Correlation Measurement of Localized Deformation in Carbon Steel in the Presence of Hydrogen

机译：氢存在下碳钢局部变形的数字图像相关测量

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Although there have been many reports related to localized plastic deformation in the presence of hydrogen, this process has not been clearly elucidated to date. In our previous report, we conducted tensile tests on hydrogen-charged carbon steel S25C. Using the digital image correlation method, we were able to measure the time evolution of the equivalent strain distribution and the equivalent strain rate distribution up to the crack initiation around the notch bottom. We then revealed that the hydrogen induced an increase in the equivalent strain rate during the deformation process and a decrease in the equivalent strain when the time the crack started to grow. In this study, we performed similar measurements on carbon steels S15C and S55C and evaluated how the deformation progressed until the crack started to grow depending on the carbon content. The results showed a decrease in the local equivalent strain when the time the crack started to grow in all of the investigated materials, but we could not identify any clear trend with respect to a carbon-content dependence. However, we observed that smaller carbon contents (i.e. , higher ferrite volume fractions) resulted in greater significance of the localization of the deformation due to the hydrogen and in a greater rate of increase in the local strain rate. In addition, on the basis of the equivalent strain distribution, we revealed that the deformation tended to localize in the ferrite phase.
机译：尽管有许多关于氢存在下局部塑性变形的报道，但迄今为止尚未清楚地阐明该过程。在我们以前的报告中，我们对氢充碳碳钢S25C进行了拉伸试验。使用数字图像相关方法，我们能够测量等效应力分布和等效应变率分布的时间演变，直到切口底部周围的裂纹开始为止。然后我们发现，在变形过程中，氢引起等效应变率的增加，而当裂纹开始扩展时，等效应变的降低。在这项研究中，我们对碳钢S15C和S55C进行了类似的测量，并根据碳含量评估了变形如何发展直至裂纹开始扩展。结果表明，在所有研究的材料中，当裂纹开始扩展时，局部等效应变都减小了，但是我们无法确定任何明显的碳含量依赖性趋势。但是，我们观察到较小的碳含量（即较高的铁素体体积分数）导致因氢引起的变形的局部化具有更大的意义，并且导致局部应变率的增加率增大。此外，根据等效应变分布，我们发现变形趋于局限在铁素体相中。

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