航空学报 > 2014, Vol. 35 Issue (10): 2857-2864   doi: 10.7527/S1000-6893.2014.0156

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

谢金鹏, 骆红云, 吕金龙, 叶康琳   

  1. 北京航空航天大学 材料科学与工程学院 航空航天材料和性能重点实验室, 北京 100191
  • 收稿日期:2014-04-21 修回日期:2014-07-09 出版日期:2014-10-25 发布日期:2014-07-23
  • 通讯作者: 骆红云,Tel.:010-82339905 E-mail:luo7128@163.com E-mail:luo7128@163.com
  • 作者简介:谢金鹏 男,硕士研究生。主要研究方向:304不锈钢位错及电化学性能。 E-mail:jarysjp@163.com;骆红云 女,博士,博士生导师。主要研究方向:声发射技术应用,超细晶不锈钢制备及性能,块状纳米材料。 Tel:010-82339905 E-mail:luo7128@163.com;吕金龙 男,博士。主要研究方向:超细/纳米晶304亚稳不锈钢制备及性能。 E-mail:ljlbuaa@126.com;叶康琳 男,硕士研究生。主要研究方向:超细晶不锈钢力学行为及热稳定性。 E-mail:ye_kanglin@163.com
  • 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

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)

摘要:

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。

关键词: 局部电化学, 表面电势, 位错堆积, 位错密度, 不锈钢

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

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