关键词: 奥氏体不锈钢, 高温, 疲劳, 寿命预测, 应变强化, 应力控制

Abstract: A fatigue experiment under stress control at high temperature is carried out for S31603 austenitic stainless steel and test data of fatigue life of solution annealed(SA) steel and cold stretched(CS) with different level steel is obtained. Based on the Hull-Rimmer cavity theory, a fatigue life prediction model applicable to stress controlling is developed. The fatigue life of the SA and CS steel is predicted by the model and the results are in good agreement with the experimental data. A model coupled with cold stretching level is deduced from two key factors：The model which applied to SA material and the changing trend of test data for the fatigue life of CS material with different level. Compared with the experimental data, the prediction results which come from the prediction model coupled with cold stretching level is found to be very satisfactory with an error band less than ±1.5 times. This model is simple in form along with clear physical significance, which is suitable for the prediction of metal material under stress control at high temperature.

Key words: austenitic stainless steel, cold stretching, fatigue, high temperature, life prediction, stress control