Abstract
The effect of stress on creep rate of austenitic stainless steels of type 347 and 316 was studied by applying the differential test technique. It was found that the creep rate could be expressed as follows, whereB 1 is a material constant depending on temperature,a 1 anda o are constants, and σ is the real stress. Considering the increase in real stress during creep process due to void formation and to the decrease in cross sectional area of the specimen, integrating the above equation yields the following creep curve,
where ∈ is the creep strain at a given time (t), ∈m is the minimum creep rate, ∈m andt m are the strain and time, respectively, at the minimum creep rate,n o is a constant, andc o is the material constant relating to the void formation. This equation agrees very well with the experimental creep curve.
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Kawasaki, T., Horiguchi, M. Analysis of accelerated creep under constant sustaining load for austenitic stainless steels. Metall Trans A 10, 749–757 (1979). https://doi.org/10.1007/BF02658397
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DOI: https://doi.org/10.1007/BF02658397