TLP扩散焊接工艺参数对GH5188高温合金接头微观组织及力学性能的影响

doi:10.7527/S1000-6893.2023.29205

Abstract

Abstract:

The transient liquid phase diffusion bonding of GH5188 superalloy is carried out by using self-designed KCo8 cobalt-based interlayer. The effects of transient liquid phase diffusion welding process parameters on the microstructure of the joint are evaluated by means of Scanning Electron Microscope （SEM）， Energy Dispersive Spectrometer （EDS） and Electron Probe Micro-Analyzer （EPMA）. The influence mechanism of welding process on the joint is explored. Moreover， the mechanical properties of the joint are evaluated by electronic universal testing machine， and the fracture mechanism is analyzed. The results show that the typical joint is mainly composed of three regions： GH5188 alloy （Base Metal）， diffusion zone of precipitated phases such as M₅B₃ and M₃B₂， and isothermal solidification zone composed of cobalt-based solid solution. The diffusion behavior of the diffusion zone is related to the welding process. With the increase of the welding temperature or the prolongation of the holding time， the density of the precipitated phase in the diffusion zone gradually decreases. The optimum process parameters are welding temperature of 1 180 ℃ and holding time of 60 min. The average tensile strength of the joint is 1 033 MPa， which is 96.5% of the base metal， and is broken in the base metal， meeting the needs of the engineering background. This study provides a reference for the wide application of GH5188 TLP diffusion welding.

Key words: GH5188 alloy, TLP, welding process, microstructure, mechanical properties

CLC Number:

V263.3

Junfei TENG, Jiahao LI, Huiyan ZHOU, Dawei WU, Haitao XU, Tiesong LIN, Yongde HUANG. Effect of TLP diffusion welding process parameters on microstructure and mechanical properties of GH5188 superalloy joint[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(8): 429205.

Figures/Tables 18

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标志点	Co	Cr	W	Ni	C	可能相
A	13.49	8.02	26.49	3.25	33.49	富W的MC
B	52.13	19.82	7.67	20.38		Co基固溶体
C	8.47	9.52	44.01	4.29	33.71	富W的M₂C

标志点	Co	Cr	W	Ni	B	可能相
A	5.18	39.09	11.97	1.94	41.82	富Cr的M₃B₂
B	9.05	35.61	12.79	4.74	37.81	富Cr的M₅B₃
C	18.15	34.77	7.22	10.11	29.75	富Cr的硼化物
D	21.57	37.45	8.29	13.35	19.91	富Cr的M₂₃B₆

标志点	Co	Cr	W	Ni	C	可能相
A	24.13	11.27	47.07	3.84	13.60	富W的M₆C
B	13.80	8.87	22.85	2.64	51.83	富W的MC

标志点	Co	Cr	W	Ni	C	可能相
A	13.49	8.02	26.49	2.09	49.90	富W的MC
B	9.03	34.57	12.06		44.34	富Cr的MC

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Effect of TLP diffusion welding process parameters on microstructure and mechanical properties of GH5188 superalloy joint

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