電気化学的手法による高温使用オーステナイト系ステンレス鋼の劣化評価技術

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Austenitic stainless steele are extensively used for high temperature components, such as heater tubes and boiler tubes in chemical and electric power generation plants. It is well known that, for these materials, the metallurgical degradation occurs at an elevated temperature which is caused by the nucleation and growth of carbides and intermetallic phases. In this study, cush metallurgical characteristics of the degraded SUS321 steel and SUS316 steel for a long term in service were investigated, and the non-deatructive evaluation of the material deterioration was performed by means of an electro-chemical methhod. The results obtained are summarized as follows : (1) The microstructural change after a long term exposure in a high temperature environment for SUS321 steel is the nucleation and growth or the decrease of TiC, M_<23>C_6 type carbide and σ phase. These precipitates except TiC cause the material degradation. (2) These precipitates have active dissolution peaks at a particular potential independent each other in the anodic polarization measurement in 1N・KOH solution. (3) The metallurgical damage by the precipitation can be estimated in terms of the active dissolution current density (I_p value), since the amount of the precipitate has a good relation with I_p value at the specifc potential obtained by the anodic pohrization measurement. (4) The material degradation occuring on SUS316 stainless steel in a high temperature exposure can also be evaluated.
社団法人日本材料学会の論文
1990-11-15

電気化学的手法による高温使用オーステナイト系ステンレス鋼の劣化評価技術

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