Abstract
1. Prolonged immersion of the alloy in an atmosphere of hydrogen and the magnitude of loading both influence the nature of fracture and critical crack propagation in specimens of 03Kh20N60MVYu. 2. In order to evaluate the influence of hydrogen on the crack resistance of alloys, determination of the property ratios KcH/Kc and KcH/σ0.2 is proposed, and also the threshold value of KIcH defining the "safe working" level for parts. 3. Heat treatment according to the regime: austenize at 1050°C, 1 h; air cool + age at 75°C, 3 h; water cool, produces the formation of a structure in alloy 03Kh20N60MVYu with uniformly distributed particles of γ′-phase whose sizes deviate only slightly from the average.
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