PCrNi3MoV high strength steel Plate

PCRNI3MOVA is a military-grade high-strength steel mainly used for artillery barrel , also can be used to manufacture machine gun barrels, pistons, firing needles, and small-caliber artillery cannons and bomb receivers.

The ultra-high-strength steel PCrNi3MoVA has the characteristics of high strength, good toughness, and high temperature resistance. It is widely used in the manufacture of ultra-high pressure vessels for petrochemical, artificial crystal, isostatic pressure, hydrostatic extrusion, and high-pressure food preservation. However, due to loads such as frequent start-ups and shutdowns, large pressure fluctuations during operation, and periodic temperature changes, materials are required to have high fatigue resistance. For the low-cycle fatigue properties of ultra-high-strength steel PCrNi3MoVA under different strain ratios, an energy-life model based on total strain energy is established, and from the perspective of continuous damage mechanics, a damage evolution equation for life prediction is proposed.

1. Research on low cycle fatigue mechanical properties of PCrNi3MoVA steel. Fully consider standard test sample preparation, equipment parameter settings, test temperature and conditions For details, the low-cycle fatigue test of PCrNi3MoVA steel specimens with different strain ratios is carried out and the influence of confidence is considered, and the low-cycle fatigue characteristics and performance parameters are obtained through reasonable test data processing.
2. PCrNi3MoVA steel fracture morphology characteristics. The low-cycle fatigue fracture specimens of PCrNi3MoVA steel with high and low strain amplitudes under different strain ratios were microscopically analyzed by scanning electron microscope, and the micro-morphological characteristics of low-cycle fatigue crack growth were initially recognized.
3. Low-cycle fatigue mechanical characteristics of PCrNi3MoVA steel. Through the analysis of the experimental results, the material properties of PCrNi3MoVA steel such as the cyclic hardening softening law and the Masing characteristic at different strain ratios are revealed, and the average stress relaxation curve, cyclic stress-strain curve, strain amplitude-life curve, and fatigue life design curve are obtained. , Plastic strain energy-life curve and total strain energy-life curve and other performance parameters.
4. Based on continuous damage mechanics, a new damage model is proposed by improving the existing dissipation potential model, and the damage variable is defined by the cyclic stress amplitude, and the low-cycle fatigue damage evolution equation of PCrNi3MoVA steel under different strain amplitudes is obtained. The comparison shows that the model is in good agreement with the test results.

Chemical Composition:

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