Effects of Welding Thermal Cycle and Post-Weld Aging on the Microstructure and Mechanical Properties of GH2070P Fe-Ni-Based Superalloy Welded Joints

ZHANG Song; XU Xiangjiu; LIU Hai; DIAO Wangzhan; WANG Ping; ZHAO Weijun

doi:10.7512/j.issn.1001-2303.2026.08.10

Quality and Efficiency in High\-Strength Steel Welding | Views : 0 下载量: 7 CSCD: 0

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Effects of Welding Thermal Cycle and Post-Weld Aging on the Microstructure and Mechanical Properties of GH2070P Fe-Ni-Based Superalloy Welded Joints
Vol. 56, Issue 8, Pages: 97-104(2026)
Received：01 July 2026，

Revised：2026-08-05，

Published：20 August 2026
DOI： 10.7512/j.issn.1001-2303.2026.08.10
稿件说明：

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张松，徐祥久，刘海，等.焊接热循环及焊后热处理对新型Fe-Ni基高温合金焊接接头的组织和力学性能的影响［J］.电焊机，2026，56（8）：97-104. DOI： 10.7512/j.issn.1001-2303.2026.08.10.

ZHANG Song, XU Xiangjiu, LIU Hai, et al.Effects of Welding Thermal Cycle and Post-Weld Aging on the Microstructure and Mechanical Properties of GH2070P Fe-Ni-Based Superalloy Welded Joints[J].Electric Welding Machine, 2026, 56(8): 97-104. DOI： 10.7512/j.issn.1001-2303.2026.08.10.

摘要

针对新型铁镍基高温合金GH2070P在时效状态下进行钨极氩弧焊（GTAW），研究焊接热循环及焊后时效处理对焊接接头显微组织与室温力学性能的影响规律。焊接接头两侧母材分别经800 ℃/20 h和800 ℃/4 h焊前预热处理，焊后进行800 ℃/4 h时效处理。结果表明，焊态接

头宏观及微观组织完好，母材及热影响区主要析出相为MC、M

和γ′相，焊缝主要析出相为M

C、MC及少量γ′相，未见其他有害析出相。焊接热循环导致HAZ中M

部分回溶、γ′相大量回溶，硬度大幅降低、存在1.5 mm宽的软化区，室温拉伸试样于HAZ断裂；经800 ℃/4 h时效强化热处理后，HAZ晶界M

及晶内γ′相重新弥散析出，焊缝基体亦析出少量γ′相，软化区硬度恢复至母材水平，拉伸断裂位置由HAZ转移至焊缝中心，接头抗拉强度与屈服强度分别提升23.3%和16.1%。研究证实，焊后时效处理可有效消除GH2070P焊接接头HAZ软化问题，为该合金在650 ℃及以上超超临界锅炉中的焊接应用提供了试验依据。

Abstract

The gas tungsten arc welding (GTAW) of the precipitation-strengthened Fe-Ni-based superalloy GH2070P in the aged condition was investigated

with emphasis on the influence of welding thermal cycling and post-weld heat treatment (PWHT) on the microstructural evolution and room-temperature mechanical properties of the welded joints. The base metals on each side of the joint were pre-treated at 800 ℃ for 20 h and 4 h

respectively

followed by post-weld aging at 800 ℃ for 4 h. The results reveal that the as-welded joint is free of macroscopic and microscopic defects. The precipitates in the base metal (BM) and heat-affected zone (HAZ) are identified as MC

and γ′ phases

while the weld metal (WM) contains M

and a trace amount of γ′. The welding thermal cycle causes partial dissolution of M

carbides and substantial dissolution of γ′ precipitates in the HAZ

producing a softened zone approximately 1.5 mm in width

where tensile fracture occurs at room temperature. Following PWHT at 800 ℃ for 4 h

carbides and γ′ precipitates re-precipitate in a fine

dispersed distribution within the HAZ

and a small quantity of γ′ phase also forms in the WM. The hardness of the softened zone recovers to the BM level

and the tensile fracture location shifts from the HAZ to the WM center

with the tensile strength and yield strength increasing by 23.3% and 16.1%

respectively. The study demonstrates that post-weld aging effectively eliminates the HAZ softening problem in GH2070P w

elded joints

providing experimental support for the welding application of this alloy in ultra-supercritical boilers operating at 650 ℃ and above.

关键词

Keywords

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