Abstract
Abstract Type 321 austenitic stainless (UNS S32100) steel boiler tubes used at 550°C for nearly 20 y in power plant are tested by electrochemical polarization. The second anodic current peak increases with service time. The second anodic current peak is caused by the formation of chromium-rich carbides and σ phase at grain boundaries. A normalized second current peak value Ip/Io read from electrochemical polarization curves is used to estimate the aging embrittlement degradation. A close relation between the normalized anodic current density value and the service time is observed. From these results, a nondestructive method for evaluating the degree of aging embrittlement of 321 stainless steel is derived.
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