Fatigue Crack Growth Characteristics of 34CrMo4 Steel for Gas Cylinders by Cold Flow Forming after Hot Drawing
نویسندگان
چکیده
The fatigue crack growth (FCG) behavior of 34CrMo4 steel, a typical material for gas cylinders, has been investigated. Specimens were taken from the base (BM) as well hot-drawn (HD) cylinder and cold-flow (CF) formed along longitudinal transverse directions. FCG tests conducted under different stress ratios materials main purpose this research was to explore influences mechanical thermal processes, sampling direction ratio on steel. To further reveal mechanism propagation at stages, microstructures fracture modes specimens analyzed by scanning electron microscopy (SEM) backscatter diffraction (EBSD), respectively. results showed that HD CF exhibited better resistance than BM. rates investigated can be accelerated increase in ratio. However, had little effect rate. Finally, driving force parameter (DFP) model used fit experimental data three with processes. A unified transition stage between stable unstable stages various conditions revealed DFP model, playing an important role early warning types
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ژورنال
عنوان ژورنال: Metals
سال: 2021
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met11010133