Effect of wire composition on weldability of a Ni-based superalloy welded by TIG method

WANG Shiyang; LIU Shiwei; HOU Xingyu; SUN Yuan; CAO Nan; SHI Wanpeng

doi:10.12073/j.hjxb.20220401001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(3): 31-36, 60. > DOI: 10.12073/j.hjxb.20220401001

WANG Shiyang, LIU Shiwei, HOU Xingyu, SUN Yuan, CAO Nan, SHI Wanpeng. Effect of wire composition on weldability of a Ni-based superalloy welded by TIG method[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(3): 31-36, 60. DOI: 10.12073/j.hjxb.20220401001

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Effect of wire composition on weldability of a Ni-based superalloy welded by TIG method

1.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2.
Empty military representative office in Liaoyang district, Shenyang 110000, China
3.
Liaoning Zhongke Boyan Technology Co., Ltd., Shenyang 110000, China
4.
Foshan Huizhen Technology Co., Ltd., Foshan 528000, China

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Received Date: March 31, 2022
Available Online: March 10, 2023

Graphical Abstract

Abstract

Abstract

To solve the fusion welding problem of K4951 alloy is the key to realize the development of a new generation of aero-engine casing. Since the K4951 alloy contains the high content of refractory elements and the weldability is poor, this study designed seven kinds of welding wires by adjusting the precipitation-strengthening elements and solid-solution strengthening elements according to the composition characteristics of the alloy. The effects of alloying elements on crack sensitivity and creep properties of the welding joints were analyzed by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), electro-probe microanalyzer (EPMA) and thermal-calc software. Results show that when the content of B was increased to 0.04%, the crack sensitivity of the joint was significantly increased, and the weld metal is fractured. Increasing the Nb content can improve the healing ability of the liquid film in grain boundary, which can reduce the welding sensitivity of welding samples, and increase the creep life of joints from 15 h to 41 h. Reducing the content of Cr and Mo can increase the crack sensitivity of the alloy to a certain extent and increase the creep life of the joint. Increasing Al content and regulating the Nb, Cr, Mo and other elements can effectively inhibit crack formation and improve the high-temperature service performance of the welding joint. The results of this study can provide an important reference value for the subsequent research on weldability of precipitation strengthened nickel-based superalloy.
- nickel-based superalloy,
- fusion welding,
- wire components,
- weldability

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References (17)

References

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Effect of wire composition on weldability of a Ni-based superalloy welded by TIG method