摘要
为了避免铝合金焊接接头软化,提升接头力学性能,采用FSW对5A06铝合金进行对接试验,在转速为1 200 r/min、焊速为150 mm/min的条件下,将焊接接头加工成一定尺寸的金相试样和拉伸试样,研究深冷处理时间对5A06铝合金搅拌摩擦焊接头组织和力学性能的影响规律,采用显微组织观察试验、显微硬度试验和拉伸试验等方法,对接头组织和力学性能进行表征与分析。结果表明:深冷处理具有细化晶粒、促进析出相析出的作用,提高了接头力学性能;经过12 h深冷处理后,接头的抗拉强度和伸长率分别达到385.3 MPa和17.2%,与未经深冷处理的接头相比,分别提高了7.4%和23.7%。因此,深冷处理可以有效提升铝合金焊接接头的力学性能,为其更广泛的应用提供了理论基础和技术参考。
In order to avoid softening and improve the mechanical properties of the aluminum alloy welded joints, the butt test of 5 A06 aluminum alloy was carried out with FSW,and the welded joints were processed into metallographic samples and tensile samples of a certain size under the conditions of a rotating speed of 1 200 r/min and a welding speed of 150 mm/min, the effect of deep cryogenic treatment(DCT) time on microstructure and mechanical properties of friction-stir-welded joints of 5 A06 aluminum alloy was investigated.The experiments were carried out by microstructure observation test, micro-hardness test and tensile test to characterize and analyze the joint organization and mechanical properties.The experiment results show that DCT can refine the grain and promote the precipitation of the second phase, thus the mechanical properties of the joints are improved.The tensile strength and elongation of the joints can reach 385.3 MPa and 17.2% respectively, which are increased by 7.4% and 23.7%,respectively after 12 h DCT compared with the joints without DCT.Therefore, DCT can effectively improve the mechanical properties of aluminum alloy joints and provide theoretical and technical basis for its application.
作者
王会霞
孙瑞
王军
张亮
胡博超
WANG Huixia;SUN Rui;WANG Jun;ZHANG Liang;HU Bochao(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang,Hebei 050018,China)
出处
《河北科技大学学报》
CAS
北大核心
2022年第4期426-433,共8页
Journal of Hebei University of Science and Technology
基金
国防基础科研计划(JCKY2017407C002)
河北省重点研发计划(19211016D,20351002D)
国家自然科学基金(51775007)
河北省高等学校科学技术研究项目(ZD2018060)。
关键词
焊接工艺与设备
深冷处理
5A06铝合金
搅拌摩擦焊
显微组织
力学性能
welding process and equipment
deep cryogenic treatment
5A06 aluminum alloy
friction stir welding
microstructure
mechanical properties
