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Effect of surface roughness on low-cycle fatigue behavior of type 304 stainless steel

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Abstract

The effects of surface roughness on the low-cycle fatigue life of Type 304 stainless steel at 593°C in air have been investigated. It is observed that, at a strain rate of 4 × 10−3 s−1 and a total strain range of 1 pct, the fatigue life (N f cycles) decreases with an increase in surface roughness. Information on crack growthvs strain cycles has been generated, as a function of surface roughness, by the measurement of striation spacing on fractured surfaces of specimens tested to failure. Crack propagation follows the Ina ∞N (wherea is the crack length afterN strain cycles) relation for longer specimen fatigue lives (Nf > 2700 cycles) and departs from Ina ∞N for shorter fatigue lives. A quantitative estimate is made of the number of cycles No(r) to generate a crack length equal to 0.1 mm (≈ 1 grain diam). The initial surface roughness significantly affects only the initiation component of specimen life time. The effect of roughness on crack initiation is described byN 0 (R) = 1012R−0.21, whereR is the surface roughness (root-mean-square value) in microns.

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Authors and Affiliations

  1. Materials Science Division, Argonne National Laboratory, 60439, Argonne, Ill.

    P. S. Maiya (Metallurgist) & D. E. Busch (Senior Technician)

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  1. P. S. Maiya
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  2. D. E. Busch
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Maiya, P.S., Busch, D.E. Effect of surface roughness on low-cycle fatigue behavior of type 304 stainless steel. Metall Trans A 6, 1761–1766 (1975). https://doi.org/10.1007/BF02642305

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  • DOI: https://doi.org/10.1007/BF02642305

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