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Hydrogen Embrittlement of Ni-Based Inconel 718 Superalloy

Hydrogen embrittlement prevails in metals and alloys and results in devastating mechanical failures such as cracking, which draws intensive attention from the academia and industries. Unveiling the functioning mechanisms of hydrogen embrittlement is critical for guiding the fabrication and operation of alloys, thereby calling for urgent research efforts. In this work, we studied the effects of hydrogen addition on the compression of a Ni-based Inconel 718 superalloy. Hydrogen was introduced into the alloy via electrochemical charging using a H 3 PO 4 -based electrolyte, at a current rate of 15 mA/cm 2 for 160 h. Cold compression of ε = 15% was carried out on the hydrogen-free and hydrogen-containing samples, and the difference in their deformation behavior was compared by microstructural analysis using Transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The results indicate that the addition of hydrogen into the Inconel 718 superalloy suppresses the twinning behavior, while the dislocation slipping was activated instead. This conclusion is evidenced by measurement of the twin and dislocation densities in the hydrogen-free and hydrogen-containing samples, as shown in Figure 1. Figure 1(a) compares the twin densities within the hydrogen-free and hydrogen-containing alloys. Compared with the hydrogen-free alloy, the hydrogen-containing alloy exhibits persistently lower twin densities at three selected locations (surface, subsurface (100 µm from the surface) and bulk (200 µm from the surface)), confirming the suppression of hydrogen on twinning. According to Figure 1(b), the hydrogen-containing sample exhibits a much higher dislocation