Microstructure and Mechanical Properties of Aluminum Alloy/Stainless Steel Dissimilar Ring Joint Welded by Inertia Friction Welding
Microstructure and Mechanical Properties of Aluminum Alloy/Stainless Steel Dissimilar Ring Joint Welded by Inertia Friction Welding
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DOI：
10.3389/fmats.2021.813118
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
F. Qin;C. Zhang;Jun Zhou;K. Xu;Qi Wang;Yun-long Li;Wen-Hui Zhang
中科院分区：
文献类型：
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作者：
F. Qin;C. Zhang;Jun Zhou;K. Xu;Qi Wang;Yun-long Li;Wen-Hui Zhang
近年来，研究异种金属混合结构的焊接性，以充分发挥其独特的优势，成为研究的热点。采用惯性摩擦焊对Φ130锻环2219铝合金与304不锈钢进行了焊接。利用光学观察（OM）、电子背散射衍射（EBSD）和扫描电子显微镜（SEM）对接头组织进行了深入观察。研究表明，焊接过程中存在明显的热力耦合效应，导致铝侧热力影响区（TMAZ）再结晶不充分，形成带状特征。各TMAZ区的晶体取向和晶粒尺寸反映出明显的差异。在接头结合面上，快速冷却抑制了金属间化合物（IMC）的生长，并发现冶金结合特性取决于IMC的不连续分布。接头平均抗拉强度可达161.3 MPa，达到2219-O的92.2%，断裂发生在铝侧母材上，呈现韧性断裂特征。
In recent years, studying the weldability of a dissimilar metal hybrid structure, with the potential to make full use of their unique benefits, has been a research hotspot. In this article, inertia friction welding was utilized to join Φ130 forged ring of 2219 aluminum alloy with 304 stainless steel. Optical observation (OM), electron back scattering diffraction (EBSD), and scanning electron microscopy (SEM) were utilized to examine the joint microstructure in depth. Depending on the research, a significant thermal–mechanical coupling effect occurs during welding, resulting in inadequate recrystallization on aluminum-side thermo-mechanically affected zone (TMAZ) and forming zonal features. The crystal orientation and grain size of each TMAZ region reflect distinct differences. On the joint faying surface, the growth of intermetallic compounds (IMCs) is inhibited by a fast cooling rate and metallurgical bonding characteristics were found depending on the discontinuous distribution of IMCs. The average joint tensile strength can reach 161.3 MPa achieving 92.2% of 2219-O; fracture occurs on aluminum-side base metal presenting ductile fracture characteristics.