GH4169合金自然萌生小裂纹扩展行为的试验研究

doi:10.7527/S1000-6893.2014.0087

Abstract

Abstract:

The growth behavior of naturally-initiated small cracks in single edge notched tensile (SENT) specimens of nickel-based superalloy GH4169 is studied. Fatigue experiments are conducted under constant amplitude loading with the stress ratios R of 0.1 and 0.5 at room temperature. A significant small crack effect is evident in this alloy, and the major part of total fatigue life is consumed in small crack propagation phase. Fracture mode under cyclic loading is established by scanning electron microscopy (SEM) and energy dispersive spectra (EDS) analysis on specimen fracture surfaces. Small cracks initiate from material inclusions, namely Ti(C, N) or Nb(C, N). A transition of fracture mode from faceted, crystallographic fracture to classical striation type of fracture occurs, corresponding to the minimum growth rate at small crack growth rate curve before crack growth acceleration.

Key words: superalloy, small crack effect, fracture mode, inclusion, scatter

CLC Number:

V216.3

ZHANG Li, WU Xueren, HUANG Xinyue. Experimental investigation on the growth behavior of naturally- initiated small cracks in superalloy GH4169[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(3): 840-847.

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Experimental investigation on the growth behavior of naturally- initiated small cracks in superalloy GH4169

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