Effects of Thermally Assisted Warm Laser Shock Processing on the Microstructure and Fatigue Property of IN718 Superalloy

doi:10.1007/s40195-021-01340-z

Abstract

Abstract:

The effects of laser shock processing (LSP) and warm laser shock processing (WLSP) on the microstructure of surface hardening layer and high-cycle fatigue performance at room temperature and high temperature (600 °C) of IN718 alloy were investigated. It has been revealed that the grain refined hardening layer with greater residual compression stresses, higher fraction of coincidence site lattice (CSL) boundaries and dislocation densities was formed in WLSP-treated alloy than in LSP-treated alloys. Moreover, microtwins included γ″ phase/high density dislocation complex was found in the surface of WLSP-treated alloy. These characters caused the significant enhancement of the medium value fatigue strength of WLSP-treated alloy at room temperature and elevated temperature. Apparently, the microtwins included γ″ phase/high density dislocation complex formed in the surface hardening layer of LSP-treated alloy has more complicated steric structure and more stable at elevated temperature than γ″ phase/low density dislocation complex formed in LSP-treated alloy, leading to the slow recovery process. Therefore, the surface hardening layer in the WLSP-treated alloy remained more ideal strengthening effect under high-cycle fatigue at elevated temperature than that in LSP-treated alloy. This resulted in the much longer fatigue crack initiation incubation and longer high-cycle life of WLSP-treated IN718 alloy under cycling load at 600 ℃. This discovery provides a new cognition of fatigue resistance by WLSP treatment of precipitation strengthening superalloy.

Key words: IN718 superalloy, Warm laser shock processing (WLSP), Microstructure, Fatigue, Residual stress

Yang Liu, Lei Wang, Kaiyue Yang, Xiu Song. Effects of Thermally Assisted Warm Laser Shock Processing on the Microstructure and Fatigue Property of IN718 Superalloy[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(12): 1645-1656.

Figures/Tables 10

Table 1 Chemical compositions of IN718 superalloy (wt.%)

C	Si	Mn	S	P	Ni	Cr	Al	Ti	Nb	Mo	Cu	B	Fe
0.058	0.149	0.165	0.001	0.011	52.500	19.250	0.440	1.100	4.930	2.980	0.044	0.003	Bal

Fig. 1 Morphologies of IN718 superalloy and precipitates: a representative grain structures obtained by EBSD (inverse pole figure map), b γ″ and γʹ, c δ at high angle grain boundary

Fig. 2 Surface layer IPF maps of IN718 superalloy: a untreated, b LSP-treated, c WLSP-treated

Fig. 3 Morphologies of γ″ phase and dislocation configuration in the surface layer of IN718 superalloy: a untreated, b LSP-treated, c WLSP-treated

Fig. 4 Hardness distribution along the depth direction from the surface to inner site of untreated, LSP- and WLSP-treated IN718 superalloys

Fig. 5 High-cycle fatigue S-N curves for untreated, LSP- and WLSP-treated IN718 superalloys: a room temperature, b 600 °C

Fig. 6 Room temperature fatigue fracture surface of IN718 superalloys

Fig. 7 Variations of surface residual stress of the untreated, LSP- and WLSP-treated IN718 superalloys: a XRD patterns of alloy surface, b surface residual stress values

Fig. 8 OIM reconstruction maps of the CSL boundaries and high angle grain boundaries, and KAM stress distribution maps in the surface hardening layer of IN718 superalloys: a, b untreated, c, d LSP-treated, e, f WLSP-treated

Fig. 9 TEM image of γ″ phase/high density dislocation complex configuration in surface hardening layer of WLSP-treated IN718 superalloy and morphology of microtwins in γ″ phase, a morphology of γ″ phase/high density dislocation complex configuration, b dark field morphology of γ″ phase/high density dislocation complex configuration, c microtwins in γ″ phase, d HRTEM image of microtwins at the interface of γ/γ″

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