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Fatigue crack propagation behaviour of a Ni−Cr−Mo steel due to rest period and overload

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Abstract

The aim of this study is to investigate the effects of an intermittent rest period at 300°C, overload in tension, and the combination of an overload and a subsequent rest period on fatigue crack growth in AISI 4340 steel. The intermittent rest period was found to stop fatigue crack growth completely near threshold level of ΔK. The alleviation effect of a rest period on crack growth was more distinct at the lower level of ΔK. In overload, the greater overload ratio (OLR=3) caused more alleviated effect on crack growth rate. The reduced stress intensity factor by crack branching and enhanced roughness of crack surface are proposed to contribute to the retardation and arrest of fatigue crack growth. The most distinct retardation of fatigue crack growth was found after the combined treatment of a overload and a subsequent rest period.

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Abbreviations

a :

Crack length in CT specimen

a :

Ratio of crack length to specimen width (a/w)

B :

Thickness of CT specimen

COD(Δδ):

Crack opening displacement

Dp :

Plastic ductility (Dp=In 100/(100−RA(%)))

ef :

Elongation ductility

H RC :

Rockwell hardness

ΔK :

Stress intensity factor range

ΔK eff :

Effective stress intensity range defined asK max −K op orK max −K cl

K max :

Maximum stress intensity factor

Kop(Kcl) :

Crack opening (or close) stress intensity factor

ΔK th :

Threshold stress intensity factor range

OLR :

Overload ratio (max. stress intensity factor during overload/max. stress intensity factor during constant load fatigue test)

ΔP :

Load range

P op :

Opening load

R :

Load ratio defined as minimum load to maximum load

RA :

Reduction in area

σu :

Ultimate tensile strength

W :

Width of CT specimen

σ y :

Yield strength

σ yc :

Cyclic yield stress

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Authors and Affiliations

  1. Department of Materials Engineering, Kangweon National University, 200-701, Chuncheon, Korea

    Song-Hee Kim & Weon-Pil Tai

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  1. Song-Hee Kim
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  2. Weon-Pil Tai
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Kim, SH., Tai, WP. Fatigue crack propagation behaviour of a Ni−Cr−Mo steel due to rest period and overload. KSME Journal 5, 79–85 (1991). https://doi.org/10.1007/BF02953605

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  • DOI: https://doi.org/10.1007/BF02953605

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