Xia Yunhao, Dong Bolun, Cai Xiaoyu, Lin Sanbao
State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China.
State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China.
Ultrason Sonochem. 2024 Aug;108:106950. doi: 10.1016/j.ultsonch.2024.106950. Epub 2024 Jun 11.
The Inconel 690 alloy is widely used in the manufacturing of nuclear equipment, such as pipe welding for steam generators (SG) and pressure vessels, due to its excellent high-temperature strength, corrosion resistance, and thermal stability. However, coarse grains have been observed in the welded joint of Inconel 690. Considering its crucial role as a structural material under high pressure, temperature, and corrosive conditions, improvements should be made to the microstructure of the welded joint. The ultrasonic-assisted gas tungsten arc welding (UA-GTAW) was used in Inconel 690 welding. The influence of ultrasonic vibration on the microstructure and mechanical properties of welded joints was studied. The results show that the ultrasonic refined the microstructure further to improve the mechanical properties. The UA-GTAW sample performed superiorities over regular GTAW joint in multi perspective including refined solidification grains, less element segregation, higher tensile strength and hardness. The Yield strength, ultimate tensile strength, and elongation increased from 320 MPa, 591 MPa, and 25.1 % to 387 MPa, 672 MPa, and 31.6 %, respectively.
因科镍合金690由于其优异的高温强度、耐腐蚀性和热稳定性，被广泛应用于核设备制造，如蒸汽发生器（SG）和压力容器的管道焊接。然而，在因科镍合金690的焊接接头中观察到了粗大晶粒。考虑到其在高压、高温和腐蚀条件下作为结构材料的关键作用，应改善焊接接头的微观结构。在因科镍合金690焊接中采用了超声辅助钨极气体保护焊（UA-GTAW）。研究了超声振动对焊接接头微观结构和力学性能的影响。结果表明，超声进一步细化了微观结构，从而改善了力学性能。UA-GTAW试样在多个方面优于常规GTAW接头，包括细化的凝固晶粒、较少的元素偏析、更高的抗拉强度和硬度。屈服强度、极限抗拉强度和伸长率分别从320MPa、591MPa和25.1%提高到387MPa、672MPa和31.6%。
