Mechanical Properties, Short Time Creep, and Fatigue of an Austenitic Steel

Abstract

The correct choice of a material in the process of structural design is the most important task. This study deals with determining and analyzing the mechanical properties of the material, and the material resistance to short-time creep and fatigue. The material under consideration in this investigation is austenitic stainless steel X6CrNiTi18-10. The results presenting ultimate tensile strength and 0.2 offset yield strength at room and elevated temperatures are displayed in the form of engineering stress-strain diagrams. Besides, the creep behavior of the steel is presented in the form of creep curves. The material is consequently considered to be creep resistant at temperatures of 400 °C and 500 °C when subjected to a stress which is less than 0.9 of the yield strength at the mentioned temperatures. Even when the applied stress at a temperature of 600 °C is less than 0.5 of the yield strength, the steel may be considered as resistant to creep. Cyclic tensile fatigue tests were carried out at stress ratio R = 0.25 using a servo-pulser machine and the results were recorded. The analysis shows that the stress level of 434.33 MPa can be adopted as a fatigue limit. The impact energy was also determined and the fracture toughness assessed.

Upsetting Analysis of High-Strength Tubular Specimens with the Taguchi Method

“…The FEM simulation was re-run with the material parameters following the Swift equation according to the case number 1 from the Table 7: σf = 713·(0.321 + εe) 0.195 (9) Comparison of experimental and FEM predicted force course during the upsetting process together with their differences are presented in Figure 4. The differences are in a close range lying below the 5% limit.…”

“…This research analyzed the specimen shape at various compression states for the determination of material parameters K, n, and R p . The simulated variation of material parameters was first selected according to Equation (9) and analyzed for three different values of the Coulomb's friction coefficient: µ = 0.035, µ = 0.045, and µ = 0.15. The influence of material parameters on the specimen shape was also analyzed with 50% higher material parameters than those determined in Equation (9):…”

“…Considering the standardized testing of material properties, uniaxial tension, and/or compression tests are most commonly used [8][9][10]. They often describe material behavior (yield stress, ultimate tensile stress, flow curve, material's anisotropy, etc.)…”

Multiaxial Fatigue Life Prediction of GH4169 Alloy Based on the Critical Plane Method

“…As a common method for predicting multiaxial fatigue life, the critical plane method has proven to be applicable to the prediction and analysis of fatigue life of engineering components under complex stress [8][9][10][11]. When fatigue damage accumulates, the component performance decreases gradually, and fatigue failure occurs after long-term operation [12,13]. Due to the existence of two independent stress-strain components that vary periodically under multiaxial loading, it is difficult to accurately determine the damage caused by loads [14].…”

Comportamento À Fadiga Em Controle Por Tensão De Aço Inoxidável Ferrítico

“…O material com o tratamento superficial apresenta um intervalo de 370 MPa, no qual a tensão de baixo ciclo é de 1200 MPa (23 921 ciclos) e a resistência à fadiga é 830 MPa para 10 6 ciclos [3]. A figura 2 indica uma curva S -N para o aço inoxidável austenítico X6CrNiTi18-10, apresentando um limite de fadiga de 434MPa [4]. Reddy at all, 2016 estudou fadiga em controle por tensão para aço inoxidável austenítico AISI321 e obteve 23000 ciclos de vida para a amplitude de tensão de 195 MPa [5].…”