Post-irradiation characterization of PH13-8Mo martensitic stainless steel

The irradiation response of PH13-8Mo stainless steel was measured up to 2.5dpa at 200 and 300°C irradiation temperatures. The PH13-8Mo, a martensitic precipitation-hardened steel, was produced by Hot Isostatic Pressing at 1030°C. The fatigue tests (high cycle fatigue and fatigue crack propagation) showed a test temperature dependency but no irradiation effects. Tensile tests showed irradiation hardening (yield stress increase) of approximately 37% for 200°C irradiated material tested at 60°C and approximately 32% for 300°C irradiated material tested at 60°C. This contradicts the shift in reference temperature (T0) measured in toughness tests (Master Curve approach), where the ΔT0 for 300°C irradiated is approximately 170°C and the ΔT0 for the 200°C irradiated is approximately 160°C. This means that the irradiation hardening of PH13-8Mo steel is not suitable to predict the shift in the reference temperature for the Master Curve approach.