Abstract
Gas-phase hydrogen permeation experiments were conducted on X80 steel at temperatures from -15℃ to 60℃ and hydrogen pressures of 1, 4, 8MPa. Hydrogen trap densities were determined, and a method for calculating nonlinear hydrogen concentration distribution was established and verified. Results reveal different temperature dependencies for hydrogen concentrations at varying pressures. At 4 and 8MPa, the hydrogen concentration increases with temperature, whereas at 1MPa, it initially decreases before increasing. Additionally, the influences of hydrogen pressure, hydrogen trap binding energy, and hydrogen trap density on this trend are discussed.
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