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. Author manuscript; available in PMC: 2021 Jun 11.
Published in final edited form as: Appl Phys Rev. 2020;7(4):10.1063/5.0012851. doi: 10.1063/5.0012851

FIG. 10.

FIG. 10.

HA-FCG of pipeline steels with varying amounts of polygonal ferrite (PF) tested at a hydrogen gas pressure of 5.5 MPa, loading frequency of 1 Hz, and stress ratio of 0.5. AF = acicular ferrite, B = bainite, P = pearlite, and XX = all secondary potential constituents. It has been found that the percent polygonal ferrite in pipeline steels correlates well with the HA-FCGR for these tests. Reprinted from Amaro et al., J. Pressure Vessel Technol. 140, 021403 (2018).111