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Microstructural characterization and mechanical properties of TIG weld joint made by forged Ti-4Al-2V alloy

机译：锻造Ti-4AL-2V合金制备的TIG焊接接头的微结构表征及力学性能

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摘要

The weld of titanium alloy promotes the complex components to be widely utilized in various fields. It is necessary to investigate the microstructure and mechanical properties to ensure the reliability of weld joint. In the present study, the microstructure, texture and mechanical properties of a joint made of the near-α titanium alloy Ti-4Al-2V, prepared by multi-layer and multi-pass TIG welding process, were investigated. The results show that the heat affected zone (HAZ) and fusion zone (FZ) are composed of a' martensite, acicular a and lath like widmanstaetten α + β, which is complex than that of the base metal (BM). Meanwhile, the texture in HAZ and FZ, including {0001} <11-20> plate texture, {11-20} <10-10> plate texture, and {11-20} <0001> plate texture, are also complicated than that of BM ({0001} <11-20> plate texture), and the texture intensity is also higher. Besides, the mechanical properties of the FZ are inferior, due to the microstructure and mechanical properties evolution. Specifically, the tensile strength of the BM, upper part and bottom part of FZ are 695 MPa, 644 MPa, and 679 MPa and the impact energy of the BM and FZ are calculated as 201.7 J/cm~2 and 70.7 J/cm~2, respectively. The hardness of the FZ (200-220 HV1) is lower than that of the BM (230-250 HV1). This study first comes to attention to systematically characterize and analyze the weldability, as well as the microstructure evolution and mechanical properties of the weld joint, of Ti-4A1-2V alloy, which will lay a solid foundation for the engineering application of this alloy in the future.
机译：钛合金的焊缝促进了在各种领域广泛使用的复杂部件。有必要研究微观结构和机械性能，以确保焊接接头的可靠性。在本研究中，研究了由多层和多通焊接工艺制备的近α钛合金Ti-4AL-2V的关节的微观结构，质地和机械性能。结果表明，热影响区（HAZ）和融合区（FZ）由“马氏体，纵向ααα+β类似的”马氏体“，α+β组成，这与基础金属（BM）复杂。同时，HAZ和FZ中的纹理，包括{0001} <11-20>板纹理，{11-20} <10-10>板纹理，以及{11-20} <0001>板纹理也复杂BM（{0001} <11-20>板纹理）的，纹理强度也更高。此外，由于微观结构和机械性能的进化，FZ的机械性能较差。具体地，FZ的BM，上部和底部部分的抗拉强度为695MPa，644MPa和679MPa，并且BM和FZ的冲击能量计算为201.7J / cm〜2和70.7J / cm〜分别为2。 FZ（200-220 HV1）的硬度低于BM（230-250HV1）的硬度。本研究首先要注意系统地表征和分析可焊性，以及TI-4A1-2V合金的焊接接头的微观结构演化和机械性能，这将为这种合金的工程应用奠定了坚实的基础未来。

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