TY - GEN
T1 - Evaluation of toughness deteriration by an electrochemicalmethod in an isothermally-aged N-containing austenitic stainless steel
AU - Saucedo-Muñoz, Maribel L.
AU - Lopez-Hirata, Victor M.
PY - 2009
Y1 - 2009
N2 - This work shows the evaluation of the cryogenic toughness deterioration by means of an electrochemical method in a N-containing austenitic stainless steel aged at temperatures of 700, 800 and 900 °C for times from 10 to 1000 minutes. The aging process at 700 and 800 °C caused the decrease in the Charpy V-Notch impact energy at -196 °C because of the intergranular precipitation of carbides. The scanning electron microscope fractographs of the Charpy V-Notch test specimens showed the presence of intergranular brittle fracture. The degree of sensitization was determined by the ratio of the maximum density current generated by the reactivation scan to that of the anodic scan, Ir/Ia using the double-loop electrochemical potentiokinetic reactivation test. The Charpy V-Notch impact energy decreased with the increase in the Ir/Ia ratio. This relation enables to estimate the deterioration of cryogenic toughness because of the thermal aging in this type of steel.
AB - This work shows the evaluation of the cryogenic toughness deterioration by means of an electrochemical method in a N-containing austenitic stainless steel aged at temperatures of 700, 800 and 900 °C for times from 10 to 1000 minutes. The aging process at 700 and 800 °C caused the decrease in the Charpy V-Notch impact energy at -196 °C because of the intergranular precipitation of carbides. The scanning electron microscope fractographs of the Charpy V-Notch test specimens showed the presence of intergranular brittle fracture. The degree of sensitization was determined by the ratio of the maximum density current generated by the reactivation scan to that of the anodic scan, Ir/Ia using the double-loop electrochemical potentiokinetic reactivation test. The Charpy V-Notch impact energy decreased with the increase in the Ir/Ia ratio. This relation enables to estimate the deterioration of cryogenic toughness because of the thermal aging in this type of steel.
KW - Austenitic stainless steels
KW - Electrochemical methods
KW - Isothermal aging
KW - Precipitation
KW - Toughness
UR - http://www.scopus.com/inward/record.url?scp=67449113773&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:67449113773
SN - 9780873397353
T3 - TMS Annual Meeting
SP - 331
EP - 338
BT - Linking Science and Technology for Global Solution - Proceedings of Symposia held during TMS 2009 Annual Meeting and Exhibition
T2 - TMS 2009 Annual Meeting and Exhibition
Y2 - 16 February 2009 through 19 February 2009
ER -