Creep Damage Assessment of Ex-Service 12% Cr Power Plant Steel Using Digital Image Correlation and Quantitative Microstructural Evaluation
Round 1
Reviewer 1 Report
This is well organized experiment using limited number of Ex-service specimens utilizing DIC technique. However, the legitimacy of creep analysis in this novel technique should be presented. For example, temperature profiles superimposed on stress profiles of the creep specimens. In addition, only two stress ranges are insufficient to draw creep parameters such as threshold stress and stress exponent, and those valued derived from fitting are unreliable.
Author Response
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Author Response.pdf
Reviewer 2 Report
The authors assess the damage of ex-service 12% Cr piping steel using accelerated creep tests that employ digital image correlation as well as micro structural investigation based on electron microscopy. The paper is well written and the results are clearly presented. The paper is well written and the results are clearly presented. With minor revisions, in my opinion, the manuscript is suitable for publication. In order to further improve the manuscript, I would like to request the authors to address my remarks listed below:
in section 2.3, authors use Abaqus to obtain the stress distribution. Could authors give the parameters that use in the elastic-plastic model? The creep rate looks noisy as time increases in Figure 3. Could authors make some necessary comments on it? In Figure 5, authors compared creep strain between the sqaure and flat cross section. For some cases, the differences seem to be quite large. A remark on this matter is necessary.Author Response
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Author Response File: Author Response.pdf
