TY - GEN
T1 - The effect of strain on the impedance and surface potential of austenite in 304 stainless steels
AU - Xie, Jinpeng
AU - Luo, Hongyun
AU - Lv, Jinlong
PY - 2013
Y1 - 2013
N2 - Local electrochemical technique was used to measure the impedance of austenite in AISI 304 stainless steel under tensile strain of 0%, 10%, 20%, 30%, 40%. Scanning Kelvin probe (SKP) technique was used to measure the potential distribution of the surface. The results showed that the impedance of the austenite declined with the increase of the strain and declined sharply under the strain of 30%. Potential of austenite decreased non-monotonously with increase of the strain. The potential reached the minimum under strain of 30% and then increased. Through the transmission electron microscope (TEM) results, plane dislocation pile-ups were observed in the grain boundary under the strain of 30% and transformed to cellular substructure structure and cell wall under 40%. Combined with the results of local electrochemistry impedance spectroscopy (LEIS) and surface potential, it may be concluded that it was the dislocation density and dislocation structure influence the impedance spectroscopy significantly, while surface potential was sensitive to the dislocation structure.
AB - Local electrochemical technique was used to measure the impedance of austenite in AISI 304 stainless steel under tensile strain of 0%, 10%, 20%, 30%, 40%. Scanning Kelvin probe (SKP) technique was used to measure the potential distribution of the surface. The results showed that the impedance of the austenite declined with the increase of the strain and declined sharply under the strain of 30%. Potential of austenite decreased non-monotonously with increase of the strain. The potential reached the minimum under strain of 30% and then increased. Through the transmission electron microscope (TEM) results, plane dislocation pile-ups were observed in the grain boundary under the strain of 30% and transformed to cellular substructure structure and cell wall under 40%. Combined with the results of local electrochemistry impedance spectroscopy (LEIS) and surface potential, it may be concluded that it was the dislocation density and dislocation structure influence the impedance spectroscopy significantly, while surface potential was sensitive to the dislocation structure.
KW - Dislocation density
KW - Leis
KW - Surface potential
UR - http://www.scopus.com/inward/record.url?scp=84875801377&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84875801377&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.749.648
DO - 10.4028/www.scientific.net/MSF.749.648
M3 - Conference contribution
AN - SCOPUS:84875801377
SN - 9783037856093
T3 - Materials Science Forum
SP - 648
EP - 653
BT - Materials Performance, Modeling and Simulation
PB - Trans Tech Publications Ltd
T2 - Chinese Materials Congress 2012, CMC 2012
Y2 - 13 July 2012 through 18 July 2012
ER -