PDF(Pubmed)
Abstract：
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.
摘要：
Inconel690合金广泛用于核设备制造，如蒸汽发生器(SG)和压力容器的管道焊接，由于其优异的高温强度，耐腐蚀性，和热稳定性。然而,在Inconel690的焊接接头中观察到粗晶粒。考虑到其在高压下作为结构材料的关键作用，温度,和腐蚀性条件，应改善焊接接头的微观结构。在Inconel690焊接中使用了超声波辅助钨极电弧焊（UA-GTAW）。研究了超声振动对焊接接头显微组织和力学性能的影响。结果表明，超声细化组织，进一步提高了力学性能。UA-GTAW样品在包括细化凝固晶粒在内的多视角方面优于常规GTAW接头，更少的元素偏析，更高的抗拉强度和硬度。屈服强度,极限抗拉强度,伸长率从320兆帕增加，591MPa,25.1%至387兆帕，672MPa,和31.6%，分别。
