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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (10): 2857-2864.doi: 10.7527/S1000-6893.2014.0156

• Articles • Previous Articles     Next Articles

Effect of Dislocation on the Electrochemical Property of Austenite in Deformed 304 Stainless Steels

XIE Jinpeng, LUO Hongyun, LYU Jinlong, YE Kanglin   

  1. Key Laboratory of Aerospace Materials and Performance, School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  • Received:2014-04-21 Revised:2014-07-09 Online:2014-10-25 Published:2014-07-23
  • Supported by:

    National Natural Science Foundation of China (51175023)

Abstract:

AISI 304 metastable austenite stainless steel transforms to martensile easily under deformation. For focus on the effects induced by dislocation rather than transformed martensite, local electrochemical techniques were used to measure the electrochemical properties on austenite grain of AISI 304 stainless steel under tensile strains of 0%, 10%, 20%, 30% and 40%. The effects of dislocation density and configuration on electrochemical impedance spectra and dynamic potential polarization curves of strained samples were investigated. The results show that the impedance of the austenite reduced with the increase of the dislocation density especially at lower strain level. The anodic current density increased with the strain level, passed over a maximum and then fell significantly. The number of dislocation in a pile-up which was calculated from the results of Scanning Kelvin probe (SKP) played a more crucial role in the change of anodic current density than dislocations density, especially at high strain level.

Key words: local electrochemical, surface potential, dislocation pile-up, dislocation density, metastale austenite stainless steel

CLC Number: