Application of fracture mechanics to the surface crack propagation in stainless steel at elevated temperatures

The propagation of small surface cracks in SUS 304 stainless steel is examined at elevated temperatures. In the temperature region studied, the crack growth is mainly cycle-dependent. When temperature is higher than 500°C, creep-dependent crack growth becomes dominant which results in a larger crack...

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Bibliographic Details
Published in:Acta materialia 1997-06, Vol.45 (6), p.2495-2500
Main Authors: Chen, Jianqiao, Takezono, Shigeo, Tao, Katsumi, Hazawa, Tomonori
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metals. Metallurgy
Physics
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Summary:The propagation of small surface cracks in SUS 304 stainless steel is examined at elevated temperatures. In the temperature region studied, the crack growth is mainly cycle-dependent. When temperature is higher than 500°C, creep-dependent crack growth becomes dominant which results in a larger crack growth rate. By confirming that the surface crack maintains a semi-elliptic shape during its growth and by investigating the cyclic deformation behavior of the material, elastic-plastic fracture mechanics parameters are evaluated and used to correlate the crack growth rate. Both the J integral range ΔJ, and the effective J integral range ΔJ eff, which accounts for the crack closure effect, are found to be excellent to consolidate crack growth rates for the high temperature fatigue conditions.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(96)00342-4