Method for predicting fatigue life of cast stainless steel containing thermal aging and environmental influence

The invention provides a method for predicting the fatigue life of cast stainless steel containing thermal aging and environmental influence. The method comprises the following steps: step 1, measuring or calculating the strain amplitude epsilon a of a dangerous part; 2, calculating the fatigue life Na in the normal-temperature air environment according to the strain amplitude-fatigue life curve of the unaged cast stainless steel in the normal-temperature air environment; and step 3, calculating the influence factor Fae of the thermal aging and environmental influence fatigue life of the stainless steel structure, correcting the fatigue life Na of the stainless steel in service, and calculating the equivalent fatigue life Nae which is equal to Na * Fae. By measuring the service time and the strain rate state of the cast stainless steel in the on-site service environment, the fatigue life of the cast stainless steel in the on-site service environment after thermal aging is obtained by considering the environme