Microstructure and pitting corrosion of armor grade AA7075 aluminum alloy friction stir weld nugget zone - Effect of post weld heat treatment and addition of boron carbide

被引：36

作者：

Kumar, P. Vijaya ^{[1
]}

Reddy, G. Madhusudhan ^{[2
]}

Rao, K. Srinivasa ^{[3
]}

机构：

[1] RIT, Dept Mech Engn, Visakhapatnam, Andhra Pradesh, India

[2] Def Met Res Lab, Hyderabad 500258, Andhra Pradesh, India

[3] Andhra Univ, Dept Met Engn, Visakhapatnam, Andhra Pradesh, India

来源：

DEFENCE TECHNOLOGY | 2015年 / 11卷 / 02期

关键词：

FSW; AA7075; Post weld heat treatment; Pitting corrosion;

D O I：

10.1016/j.dt.2015.01.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Friction stir welding (FSW) of high strength aluminum alloys has been emerged as an alternative joining technique to avoid the problems during fusion welding. In recent times FSW is being used for armor grade AA7075 aluminum alloy in defense, aerospace and marine applications where it has to serve in non uniform loading and corrosive environments. Even though friction stir welds of AA7075 alloy possess better mechanical properties but suffer from poor corrosion resistance. The present work involves use of retrogression and reaging (RRA) post weld heat treatment to improve the corrosion resistance of welded joints of aluminum alloys. An attempt also has been made to change the chemical composition of the weld nugget by adding B4C nano particles with the aid of the FSW on a specially prepared base metal plate in butt position. The effects of peak aged condition (T6), RRA and addition of B4C nano particles on microstructure, hardness and pitting corrosion of nugget zone of the friction stir welds of AA7075 alloy have been studied. Even though RRA improved the pitting corrosion resistance, its hardness was slightly lost. Significant improvement in pitting corrosion resistance was achieved with addition of boron carbide powder and post weld heat treatment of RRA. Copyright (C) 2015, China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.

引用

页码：166 / 173

页数：8

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