Effects of temperature on the low cycle fatigue behaviour of nitrogen alloyed type 316L stainless steel

• Published in: International journal of fatigue Vol. 13; no. 6; pp. 471 - 478
• Main Authors: Srinivasan, V.S., Sandhya, R., Bhanu Sankara Rao, K., Mannan, S.L., Raghavan, K.S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.11.1991; Elsevier Science
• Subjects: 316L stainless steel; Applied sciences; deformation; dynamic strain ageing; Exact sciences and technology; fracture; low cycle fatigue; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; temperature effects; deformation; low cycle fatigue; dynamic strain ageing; 316L stainless steel; temperature effects; fracture; Austenitic stainless steel; Temperature; Low cycle fatigue; Strain ageing; Rupture; Crack propagation
• ISSN: 0142-1123; 1879-3452
• DOI: 10.1016/0142-1123(91)90482-E

Strain-controlled low cycle fatigue tests have been conducted in air between 298–873 K to ascertain the influence of temperature on LCF behaviour of nitrogen-alloyed type 316L stainless steel. A strain amplitude of ± 0.60% and a symmetrical triangular waveform at a constant strain rate of 3 × 10 −3 s −1 were employed for all tests. Crack initiation and propagation modes were evaluated, and the deformation and damage mechanisms which influence the cyclic stress response and fatigue life identified. The cyclic stress response at all temperatures was characterized by an initial hardening to the maximum stress, followed by gradual softening prior to attaining saturation. Temperature dependence of fatigue life showed a maximum in the intermediate temperature range. The drastic reduction in fatigue life at elevated temperatures has been ascribed primarily to the combined influence of dynamic strain ageing effects and oxidation-enhanced crack initiation, while the lower life at room temperature is attributed to detrimental effects associated with deformation-induced martensite.