作者: Leslie Bartosiewicz , A.R. Krause , F.A. Alberts , Iqbal Singh , Susil K. Putatunda
DOI: 10.1016/1044-5803(93)90069-8
关键词: Cast iron 、 Austempering 、 Fracture mechanics 、 Fatigue limit 、 Stress concentration 、 Microvoid coalescence 、 Paris' law 、 Metallurgy 、 Austenite 、 Materials science
摘要: Abstract An investigation was carried out to examine the influence of austempering heat treatments and resultant microstructure austempered ductile cast iron, on fatigue crack growth rate, threshold, high-cycle strength material. Two different approaches were used study behavior this relatively new material, that is, a traditional S-N curve approach for determination fracture mechanics-based threshold. Compact tension cylindrical specimens prepared from alloyed nodular iron given three produce microstructures. The threshold these studied in room temperature ambient atmosphere. results present demonstrate material increases with increase volume fraction carbon-saturated austenite. other hand, found decrease austenitic grain size. process combination striations microvoid coalescence, propagation by connecting graphite nodules along its path.