High Temperature Creep of a 20Cr-25Ni Stainless Steel with Carbide Precipitation : Quantitative Analysis of the Precipitates and Theoretical Study of the Steady State Creep(Materials, Metallurgy & Weldability)

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The variations in the steady state creep behaviour with temperatures (1053〜1213K) for 20Cr-25Ni austenitic stainless steel are reported. Specimens in the solution treated condition (30min. at 1473K) were crept in air over the applied stress range 13.4〜44.1MPa. The apparent activation energy in the lower temperature region is approximately equal to the activation energy for self-diffusion of Fe, but that in the higher temperature region is stress sensitive, increasing with increasing stress. It is indicated that the creep deformation mechanism under the lower stress level is independent of the test temperatures, being the diffusion controlled dislocation creep, and that in the higher stress condition the rate controlling process changes from the diffusional recovery to the glide of mobile dislocations at the transition temperature, T_E. This is supported by analyzing the experimental results of the strain dip tests and characterizing the distribution of carbide precipitates.
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