TY - JOUR
T1 - Sensitivity of thermo-electric power measurements to α–α′ phase separation in Cr-rich oxide dispersion strengthened steels
AU - Pinkas, Malki
AU - Foxman, Zvi
AU - Froumin, Nataly
AU - Hähner, Peter
AU - Meshi, Louisa
N1 - Funding Information:
The authors would like to thank Dr. Y. Gelbstein for performing the TEP measurements and Mr. O. Omassi for casting the model alloys. This study was supported by a dedicated collaboration agreement between the Israel Atomic Energy Commission and the Joint Research Centre of the European Commission.
Publisher Copyright:
© 2015, Springer Science+Business Media New York.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - The sensitivity of thermo-electric power (TEP) measurement to detect the undesired α–α′ phase separation occurring in Cr-rich oxide dispersion strengthened steels was investigated. TEP values were found to increase with time of exposure to 475 °C—the maximum temperature of the miscibility gap in Fe–Cr alloys. Exposure to 650 °C did not induce any changes in the TEP value. By examining the bend contours in dark-field TEM images, α′ precipitates were evidenced in aged PM2000. Using the Fe–XCr–YAl model alloys and X-ray photoelectron spectroscopy, the changes in TEP were traced back to the depletion of Cr from the matrix, caused by the formation of the Cr-rich α′ phase. By quantifying the effect of Cr content on the TEP value of model alloys, it was estimated that following 1000 h of aging, the Cr concentration in the α matrix of PM2000 alloy was reduced from 20 to ~13.5 at.%.
AB - The sensitivity of thermo-electric power (TEP) measurement to detect the undesired α–α′ phase separation occurring in Cr-rich oxide dispersion strengthened steels was investigated. TEP values were found to increase with time of exposure to 475 °C—the maximum temperature of the miscibility gap in Fe–Cr alloys. Exposure to 650 °C did not induce any changes in the TEP value. By examining the bend contours in dark-field TEM images, α′ precipitates were evidenced in aged PM2000. Using the Fe–XCr–YAl model alloys and X-ray photoelectron spectroscopy, the changes in TEP were traced back to the depletion of Cr from the matrix, caused by the formation of the Cr-rich α′ phase. By quantifying the effect of Cr content on the TEP value of model alloys, it was estimated that following 1000 h of aging, the Cr concentration in the α matrix of PM2000 alloy was reduced from 20 to ~13.5 at.%.
UR - http://www.scopus.com/inward/record.url?scp=84937762730&partnerID=8YFLogxK
U2 - 10.1007/s10853-015-9014-0
DO - 10.1007/s10853-015-9014-0
M3 - Article
AN - SCOPUS:84937762730
SN - 0022-2461
VL - 50
SP - 4629
EP - 4635
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 13
ER -