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采用真空电子束焊接工艺研究CT20钛合金的焊接性能,分析电子束焊接过程中不同工艺参数对焊缝形状的影响。通过对显微组织的观察以及显微硬度和低温拉伸性能的测试,分析焊接接头显微组织、断口形貌及焊缝中气孔的形成。结果表明:CT20钛合金的焊接性能优良,焊接接头的抗拉强度达到785 MPa,断口部位位于热影响区;焊缝和靠近焊缝热影响区的显微组织均为典型的魏式组织,母材显微组织为块状初生α相和β转变组织构成的双态组织。采用真空电子束焊焊接的CT20合金板材,其焊缝的硬度值比母材的高,焊缝和热影响区中较粗大的原始β相一部分转变为过饱和的针状马氏体。
The welding performance of CT20 titanium alloy was studied by vacuum electron beam welding, and the influence of different process parameters on the shape of weld was analyzed. Through the observation of the microstructure and the testing of the microhardness and low temperature tensile properties, the microstructure of the welded joint, the fracture morphology and the formation of the pores in the weld were analyzed. The results show that the weldability of CT20 titanium alloy is excellent, the tensile strength of welded joint reaches 785 MPa and the fracture site is located in the heat affected zone. The microstructure of the weld and the heat affected zone close to the weld seam are typical Wei - The material microstructure is a bimodal structure composed of massive primary α-phase and β-transformed tissue. The vacuum electron beam welding of CT20 alloy sheet, the hardness of the weld is higher than the base metal, the weld and the heat-affected zone coarser part of the original β into supersaturated acicular martensite.