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Evaluation of material degradation in in-service high temperature structural component by a chemical etching test |
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| Authors: | F Nogata and K Seo H Takahashi and K Tamagawa S H Chung |
| Affiliation: | Department of Mechanical Engineering, Himeji Institute of Technology, 2167 Shosha, Himeji-shi, 671-22, Japan Faculty of Engineering, Tohoku University Aramaki Aoba-ku, Sendai-shi 980, Japan Department of Precision Engineering, Chonbuk National University, Chonju-shi 520, Republic of Korea |
| Abstract: | An etching test using a picric acid solution with a wetting agent was found to have great potential for the nondestructive evaluation of grain boundary embrittlement caused by phosphorus segregation in both CrMo and CrMoV steels, and by carbide or sigma phase precipitation in austenitic stainless steel. A line pipe (CrMo) and a steam turbine rotor (CrMoV) were tested on-site to demonstrate whether the etching test would be a useful tool. The ΔFATT value estimated by the etching test agreed reasonably well with the ΔFATT determined by an electrochemical method for the turbine rotor steel. A good correlation was found between the degree of intergranular corrosion and the material deterioration of SUS316 stainless steel used as a superheater of a fossil fuel boiler. |
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