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The hydrogen-enhanced fatigue crack propagation (FCP) of bainitic and tempered martensitic structures in AISI 4130 steel has been evaluated. Three bainitic structures involved in the study were obtained by isothermal transformation at 330°C, 370°C and 470°C. By selecting appropriate tempering temperatures, three tempered martensitic specimens with yield strengths corresponding to those of the bainitic...
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