000			01902nab a2200205 4500
005			20260520000857.0
008			260224s2009 xxu
245	0	0	_aEffect of Aging Treatments on the Repassivation Potential of Duplex Stainless Steel S32205
260			_a _b _coct. 2009
270			_a07/07/2010 ; 07/07/2010
300			_a13 p. ; 650-662
520			_aTranscripción del resumen del autor. The effect of isothermal heat treatments at 475, 700, and 870°C on the localized corrosion susceptibility of 2205 duplex stainless steel (UNS S32205) was assessed in chloride-containing environments at 60°C. Microstructural changes with heat treatment were analyzed with scanning transmission electron microscopy (STEM) for thermally treated S32205. The results of the tests indicate that exposure of S32205 to these temperatures resulted in an initial drop in the crevice repassivation potential (Ercrev). This drop was partially recovered for specimens aged at 870°C for times longer than 5 h, but the recovery was not observed for the 700°C aged material. The drop in Ercrev correlated with the precipitation and growth of Cr-depleted secondary austenite as well as a grain boundary chromium-depleted (GBCD) layer between a Cr-rich precipitate and the decomposing ferrite matrix. The depletion severity of the secondary austenite phase differed for S32205 aged at 700°C and 870°C, with the 700°C aged materials yielding a secondary austenite phase containing approximately 12.5% Cr and the 870°C precipitated secondary austenite containing approximately 15.8% Cr. The formation of secondary austenite results in a non-recoverable loss of localized corrosion resistance for S32205.
581			_a10
773	0		_tCorrosion _g65
942			_cARTICULO
100	1		_aSridhar, N. _925212
100	1		_aTormoen, G. _943528
100	1		_aHackney, S. _943529
999			_c171819 _d171819