High-Temperature Fatigue Behavior of Inertia Friction Welded Joints of GH4065A Ni-Based Superalloy

doi:10.1007/s40195-024-01739-4

Abstract

Abstract:

In this work, the novel Ni-based superalloy GH4065A inertia friction welding (IFW) joints were subjected to the post-welding heat treatments (PWHT) at 730 ℃ for 5 h or 760 ℃ for 5 h, and the differences in microstructure characteristics, local mechanical properties, and fatigue failure life were focused. Furthermore, based on the high-temperature low-cycle fatigue testing and characterization results, the correlation between the microstructure characteristics and low-cycle fatigue damage behavior was systematically analyzed. It was found that there were smaller grains in the thermo-mechanically affected zone (TMAZ) than in the weld zone and heat-affected zone (HAZ), and the boundary region between TMAZ and HAZ was the fatigue failure position of IFW joints under the high-temperature low-cycle fatigue loading. The fatigue testing results showed that the high-temperature fatigue performance for GH4065A IFW joints degenerated with the increase in PWHT temperature. There existed cyclic softening and inhomogeneous fatigue damage in an IFW joint, which was more significant under the 760 ℃ 5 h PWHT condition. Microstructurally, dislocation tangles and cells formed in the boundary region between TMAZ and HAZ under the fatigue loading. The difference in grain size after the IFW process and the inhomogeneous γ′ phrase re-precipitation after the PWHT in the boundary region between TMAZ and HAZ resulted in the local inhomogeneous strengthening, corresponding to uneven plastic deformation and fatigue failure behavior under the fatigue loadings.

Key words: Inertia friction welding, GH4065A alloy, Low-cycle fatigue, Post-welding heat treatment, Fatigue behavior

Xiaoguang Li, Jiatao Liu, Qing Liu, Chunbo Zhang, Hang Liang, Lei Cui, Yongchang Liu. High-Temperature Fatigue Behavior of Inertia Friction Welded Joints of GH4065A Ni-Based Superalloy[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(11): 1935-1946.

Figures/Tables 13

Table 1 Primary chemical compositions of GH4065A (wt%) [8]

C	Cr	Co	Al	Ti	Nb	Mo	W	Ni
0.015	16	12.65	2.1	3.7	0.7	4.0	4.0	Bal.

Fig. 1 Low-cycle fatigue specimens: a location of specimen sampling, b the specimen dimensions

Fig. 2 Typical morphologies of different zones in the GH4065A as-welded IFW joint: a, b low and high magnified micrographs, c WZ, d TMAZ, e HAZ

Fig. 3 Typical morphologies of different zones in the GH4065A PWHTed IFW joint: a, b, c 730 ℃ 5 h, d, e, f 760 ℃ 5 h

Fig. 4 Average grain sizes for the various zones of the GH4065A as-welded and PWHTed IFW joints

Fig. 5 Hardness distributions across the GH4065A IFW joints

Fig. 6 Low-cycle fatigue failure life of the GH4065A IFW joints

Fig. 7 Typical cross section fatigue fracture morphologies of the GH4065A IFW joints (730 ℃ 5 h): a cross section of the fatigue failed specimen, b macroscopic fracture morphology

Fig. 8 Fatigue surface morphologies of the GH4065A IFW joints: a, b, c (as indicated in b) PWHTed joint at 730 ℃ 5 h, d, e, f (as indicated in e) PWHTed joint at 760 ℃ 5 h

Fig. 9 Uniaxial hysteresis loops under various cycles for the GH4065A IFW joints at the strain amplitude of 0.6%: a 730 ℃ 5 h, b 760 ℃ 5 h, c stress values corresponding to strain value of 0.6%

Fig. 10 EBSD maps of the PWHTed GH4065A IFW joint specimen experiencing 100-cycle loading: a, b PWHTed joint at 730 ℃ 5 h, c, d PWHTed joint at 760 ℃ 5 h; a, c the inverse pole figure (IPF) maps, b, d the KAM maps

Fig. 11 Dislocation structure morphologies of the GH4065A IFW joints after 100-cycle uniaxial fatigue tests at the stain amplitude of 0.6%: a, b PWHTed joint at 730 ℃ 5 h, c, d PWHTed joint at 760 ℃ 5 h

Fig. 12 SEM images near the fatigue fracture regions (HAZ side) of GH4065A IFW joints after uniaxial fatigue tests at the stain amplitude of 0.6%: a, b PWHTed joint at 730 ℃ 5 h, c, d PWHTed joint at 760 ℃ 5 h

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