Effect of grain size and residual stress on the corrosion resistance of friction stir spot welded AZ31B joints

被引：23
作者：
Savguira, Y. [1 ]
North, T. H. [1 ]
Thorpe, S. J. [1 ]
机构：
[1] Univ Toronto, Dept Mat Sci & Engn, 184 Coll St,Rm 140, Toronto, ON M5S 3E4, Canada
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2016年 / 67卷 / 10期
基金：
加拿大自然科学与工程研究理事会;
关键词：
grain size; magnesium; polarization; residual stress; welding; PROCESSED MAGNESIUM ALLOY; MG-ALLOY; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; MASS-LOSS; MICROSTRUCTURE; BEHAVIOR; SURFACE; ORIENTATION; IMPEDANCE;
D O I：
10.1002/maco.201608925
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Localized corrosion at the weld periphery of AZ31B friction stir spot welds has been associated with the formation of a galvanic cell between the stir zone material and the adjacent base metal. However, this explanation did not take into account the effects of residual stress and grain growth in material adjacent to the stir zone region. In this study, the influence of microstructural changes on the electrochemical characteristics of FSSW joints is investigated using a combination of microcapillary polarization, stress relief heat-treatment and micro-hardness testing. It is confirmed that residual stress has no significant effect on the corrosion resistance properties of completed joints. Also, based on a detailed examination of the electrochemical characteristics of materials in the stir zone, TMAZ and HAZ regions, grain growth had negligible influence on the corrosion resistance properties.
引用
收藏
页码：1068 / 1074
页数：7
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