摘要
通过拉伸测试、硬度测试、电化学测试,研究了2024-T3合金板材搅拌摩擦焊接接头的力学性能、显微组织和局部腐蚀行为。结果表明:焊接接头的硬度曲线呈现W型,轴肩区域内硬度较低,在远离焊缝中心约10 mm的区域内出现了明显软化,软化区处于热影响区;热影响区的耐蚀性高于焊核区的,焊核区的腐蚀电位最低,腐蚀电流最高,抗腐蚀性能较差。主要是由于在该焊接参数下,焊核区经历了较高的温度,强化相(S相)发生粗化,腐蚀敏感性提高。
The mechanical properties, microstructure and localized corrosion behavior of 2024-T3 aluminum alloy friction-stir-welded joint were investigated with tensile testing, hardness testing, and electrochemical corrosion testing. The results show that the hardness curve of the welded joint exhibits ＂W＂ shape, and the lowest hardness appears at the shoulder zone. Softening zone appears at about 10 mm from the weld center and the softening zone is in the heat affected zone （HAZ）. The SZ exhibits lower corrosion potential, higher current density and lower corrosion resistance than those of the HAZ. In the welding process with these welding parameters, the higher temperature in SZ facilitates the formation and coarsening of S phase and the increase of the pitting corrosion susceptibility.
出处
《轻合金加工技术》
CAS
北大核心
2018年第1期61-66,共6页
Light Alloy Fabrication Technology
基金
陕西省教育厅自然科学基金(16JK1172)
陕西铁路工程职业技术学院2016年科研基金项目(KY2016-23)
关键词
铝合金
搅拌摩擦焊
力学性能
显微组织
局部腐蚀
aluminum alloy
friction stir weld
mechanical properties
microstructure
localized corrosion
