TA1/Cu/X65復(fù)合板焊接接頭微觀組織及力學(xué)性能研究

TA1/Cu/X65復(fù)合板焊接接頭微觀組織及力學(xué)性能研究Investigation on the Microstructure and Mechanical Property of the Welding Joint of TA1/Cu/ X65 Trimetallic Sheets

本試驗對TA1/Cu/X65三層復(fù)合板（復(fù)層Ti厚2mm,中間層Cu厚1mm,基層X65管線鋼厚12mm）進行了鎢極氬弧焊（TIG）對接焊，設(shè)計并制備了過渡層焊接材料Cu-Ag-Mo-Nb藥芯焊絲，從而對焊接接頭性能進行有效冶金調(diào)控。通過SEM、EDS、XRD、TEM對接頭組織特征、界面元素分布進行了分析、鑒定，通過拉伸和顯微硬度試驗測試了接頭的力學(xué)性能。結(jié)果表明:焊縫各層填充金屬之間冶金結(jié)合良好，且有明顯的熔合線和過渡帶，其中，在鈦焊縫和過渡層焊縫之間存在寬度大約為150μm的Ti-Cu冶金反應(yīng)區(qū),過渡層焊縫和鋼焊縫之間的組織主要是鐵基固溶體和銅基固溶體。中間銅夾層和Cu-Ag-Mo-Nb藥芯焊絲的使用，抑制了Ti-Fe硬脆金屬間化合物的產(chǎn)生，取而代之的是塑性相對較好的Cu基固溶體和Ti-Cu、Ti-Ag等金屬間化合物。接頭的平均抗拉強度為507MPa，主要由X65層貢獻。焊縫硬度值在各過渡界面處均發(fā)生突變，其中在Cu-Ag-Mo-Nb、ERTA-1焊縫處硬度可高達447和507HV10，對接頭塑韌性有很大影響。

Titanium and its alloys with fine corrosion resistance and specific tenacity are widely used in the field of astronautics, chemical industry and so on. The pipeline steels are always used in petroleum industry because of its high strength and toughness. Composite panels are widely used in petrochemical industry, aerospace engineering and other fields, which can combine the respective features of the dissimilar materials together so as to meet the special requirements. Previous studies have shown that the joining of titanium and steel suffered from two major challenges. One was the emergence of continuous distributed intermetallics of TiFe and TiFe2 in the weld, which caused brittle fracture with low strength, the other was the occurrence of residual stresses that were caused by the great differences in thermal properties between titanium and steel. This work is aimed to join the explosion-bonded TA1/Cu/X65 trimetallic sheets (titanium flyer plate with thickness 2 mm, Copper intermediate plate with thickness 1 mm, X65 base plate with thickness 12 mm) with Cu-based flux-cored wires by the Tungsten Inert Gas (TIG) welding. The microstructure observation of welded joint was characterized by scanning electron microscope (SEM) equipped with energy dispersive spectrum (EDS)，transmission electron microscope（TEM）and X ray diffraction meter (XRD). Tensile and microhardness tests were conducted to reveal the mechanical properties. The results indicated that the filler metals for each weld layer have obvious zoning by using solid solution phases and intermetallic compounds. There was about 150μm width Ti-Cu reaction zone between the Ti weld and transition layer weld. The intermediate copper played an important role in reducing the high temperature residence time of welded joints so as to reduce the diffusion of Ti, Fe element. Consequently, the hard-brittle Ti-Fe intermetallic compounds were partly replaced by Cu-based solid solution and Ti-Cu, Ti-Ag intermetallic compounds which were relatively good ductility and toughness. The average tensile strength of the butt joints is 507MPa at room temperature，mainly of that of X65 was obtained. ERTi-1 weld metal exhibited higher hardness than Cu-Ag-Mo-Nb weld metal. The microhardness value was 507 HV10 and 447HV10 respectively. The micro-hardness in reaction zone presented a slightly drop. The lowest values occurred in ER50-6 weld metal.

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