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Acoustic microscopy and small-angle neutron scattering were applied to non-destructively evaluate the hydrogen-induced cracking of API steels and to find the initiation time of the crack. The API steels had equiaxed grains with about 4 to 12-μm average grain size along the rolling, sample-normal, and transverse directions. For 5 days of immersion in a sodium-acetic solution with chloride ions (NaCl:...
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