位错对形变304亚稳态不锈钢中奥氏体的电化学性能的影响
收稿日期: 2014-04-21
修回日期: 2014-07-09
网络出版日期: 2014-07-23
基金资助
国家自然科学基金（51175023）
Effect of Dislocation on the Electrochemical Property of Austenite in Deformed 304 Stainless Steels
Received date: 2014-04-21
Revised date: 2014-07-09
Online published: 2014-07-23
Supported by
National Natural Science Foundation of China (51175023)
AISI 304亚稳态奥氏体不锈钢形变时容易发生相变，为避免产生相变马氏体而专注于研究位错的影响，采用局部电化学技术研究了拉伸应变分别为0%、10%、20%、30%和40%时的AISI 304不锈钢中奥氏体晶粒的电化学性能的变化规律，并分析了位错密度及位错组态对阻抗谱和动电位极化曲线等电化学性能的影响机理。研究结果表明：奥氏体的阻抗随位错密度的增大而降低，在低应变水平下位错密度的增大对阳极电流密度的降低有着重要作用；阳极电流密度随应变水平增加而增加，达到一个最大值后显著下降。通过扫描开尔文探针（SKP）的测量结果，计算得知位错堆积数比位错密度对阳极电流密度的影响更为显著，尤其是对于高应变水平不锈钢。
谢金鹏 , 骆红云 , 吕金龙 , 叶康琳 . 位错对形变304亚稳态不锈钢中奥氏体的电化学性能的影响[J]. 航空学报, 2014 , 35(10) : 2857 -2864 . DOI: 10.7527/S1000-6893.2014.0156
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.
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