000			01835nab a2200193 4500
005			20260520001028.0
008			260224s2011 xxu
245	0	0	_aInfluence of heat treatment time and temperature on the microstructure and corrosion resistance of cast superaustenitic stainless steels
260			_a _b _cmayo 2011
270			_a19/05/2011 ; 19/05/2011
300			_a11 p. ; 055002
520			_aTranscripción del resumen del autor. The influence of heat treatment time and temperature on the microstructure and corrosion resistance of cast stainless steel alloys CN3MN (UNS J94651) and CK3MCuN (UNS J93254) were investigated with a combination of microscopy techniques and immersion corrosion testing. The as-cast alloys exhibited significant residual microsegregation of Mo across the dendritic substructure and the presence of sigma (s) phase in the interdendritic regions. Complete dissolution of the sigma phase and homogenization of Mo occurred after a heat treatment of 1,205°C for 4 h for castings with an average dendrite spacing of 35 µm. A heat treatment of only 1,150°C for 1 h was sufficient to produce similar results in welds with a smaller dendrite spacing of 10 µm. The use of the 1,205°C/4-h treatment restored the corrosion resistance of the cast alloys to a level that is comparable to the wrought counterpart alloys when evaluated using the ASTM G48 Method A test. This improvement is attributed to homogenization of Mo and dissolution of the s phase. Calculated curves are proposed to estimate the combination of time and temperature needed for effective heat treatment of castings with various dendrite spacings.
581			_a5
773	0		_tCorrosion _g67
942			_cARTICULO
100	1		_aMaier, B. _944822
100	1		_aFrankel, G.S. _927480
999			_c181826 _d181826