硝酸塩溶液を用いた電気化学的手法による Cr-Mo-V 鋳鋼の焼もどし脆化の非破壊評価

概要

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Quantitative evaluation of temper embrittlement of turbine casing material, Cr-Mo-V cast steel, by means of anodic polarization behavior in calcium nitrate solution was investigated. Furthermore, based upon these results, nondestructive electrochemical method for detection and evaluation of temper embrittlement of Cr-Mo-V cast steel is newly developed with high sensitivity. Intergranular Corrosion (IGC) occurs only on temper embrittled samples during anodic polarization process in calcium nitrate solution. In polarization curves measured at 60℃, the characteristic changes such as increases in current density at passive potential range and in passivation potential attributable to IGC have a excellent correlation with shifts in FATT caused by temper embrittlement. On the other hand, in polarization curves measured at 30℃, increases in the current density of the second peak current attributable to IGC have a good correlation with shifts in FATT. By use of these electrochemical characteristic values, the degree of temper embrittlement can be quantitatively estimated.
社団法人日本鉄鋼協会の論文
1991-04-01