Semenova Irina P, Shchitsyn Yuri D, Trushnikov Dmitriy N, Gareev Alfiz I, Polyakov Alexander V, Pesin Mikhail V
Laboratory of Multifunctional Materials, "Higher Engineering School of Aerospace Materials" Center, Ufa University of Science and Technology, 32 Zaki Validi St., Ufa 450076, Russia.
Department of Mechanical Engineering Innovative Technologies, Perm National Research Polytechnic University, 29 Komsomolsky pr., Perm 614990, Russia.
Materials (Basel). 2023 Jan 19;16(3):941. doi: 10.3390/ma16030941.
Wire arc additive manufacturing (AM) is able to replace the traditional manufacturing processes of Ti alloys. At the same time, the common drawback of Ti workpieces produced by AM via wire deposition welding is the formation of a coarse-grained dendritic structure, its strong anisotropy and, consequently, lower strength as compared to a monolithic alloy. In this work, a new method is proposed for the enhancement of the strength properties of the Ti-6Al-4V alloy synthesized by AM via wire deposition welding, which involves the use of a wire with an initial ultrafine-grained (UFG) structure. The UFG wire is characterized by a large number of defects of the crystalline lattice and grain boundaries, which will enable increasing the number of "crystallization centers" of the α-phase, leading to its refinement. The macro- and microstructure, phase composition and microhardness of the Ti-6Al-4V alloy samples were investigated. The microhardness of the alloy produced by layer-by-layer deposition welding using a UFG wire was shown to be on average 20% higher than that of the samples produced by a deposition welding using a conventional wire. The nature of this phenomenon is discussed, as well as the prospects of increasing the mechanical characteristics of Ti alloys produced by additive manufacturing.
电弧增材制造（AM）能够取代钛合金的传统制造工艺。与此同时，通过丝材熔敷焊接进行增材制造生产的钛工件的常见缺点是形成粗晶树枝状组织、强烈的各向异性，因此与整体合金相比强度较低。在这项工作中，提出了一种新方法来提高通过丝材熔敷焊接进行增材制造合成的Ti-6Al-4V合金的强度性能，该方法涉及使用具有初始超细晶粒（UFG）结构的丝材。超细晶粒丝材的特点是晶格和晶界存在大量缺陷，这将增加α相的“结晶中心”数量，从而使其细化。研究了Ti-6Al-4V合金样品的宏观和微观结构、相组成及显微硬度。结果表明，使用超细晶粒丝材通过逐层熔敷焊接生产的合金的显微硬度平均比使用传统丝材进行熔敷焊接生产的样品高20%。讨论了这种现象的本质，以及提高增材制造生产的钛合金力学性能的前景。
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