Experimental Study on Hydrogen-Induced Crack Propagation of X80 Steel Under Alternating Pressure Fluctuations. - Wang, Ailing; Wang, Baogang; Jiang, Ruijing; Nie, Ruyu; Cui, Gan; Liu, Jianguo; Zhang, Yi; Zhang, Hao; Xing, Xiao (Materials (1996-1944), 2025)