A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature

doi:10.1007/s40195-022-01398-3

Abstract

Abstract:

The dynamic strain aging (DSA) behavior was investigated in GH4169 alloy during tensile deforming with electric-pulse current (EPC) at 750 °C. The results show that DSA is restrained in the alloy when deformed with 40 Hz-EPC. The size of γ″ phase inner grains increases obviously and δ phase is facilitated to precipitate on grain boundary in the alloy applied with EPC, due to the promotion effect of EPC on the diffusion and segregation of atoms. Transmission electron microscopy (TEM) results indicate that dislocations can cut through small γ″ precipitate with the size of less than 10 nm, while dislocations can only bypass dislocations when γ″ precipitate grow up over 20 nm. The growth of precipitates consumes large amounts of atoms as well as the velocity of dislocation increase, which makes dislocations difficult to be pinned. Therefore, when γ″ precipitates grow up to a large size more than the critical size of dislocation pinning, DSA is significantly restrained in the alloy after necking deformed with EPC.

Key words: GH4169 alloy, Electric-pulse current, Dynamic strain aging, Microstructure

Xin-Tong Lian, Jin-Lan An, Lei Wang, Han Dong. A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(11): 1895-1902.

Figures/Tables 11

Table 1 Chemical compositions of GH4169 alloy hot rolling sheet (wt%)

Fe	Cr	Mo	Nb + Ta	Ti	Al	Si	C	B	S	Ni
18.73	18.93	3.04	5.26	1.00	0.56	0.08	0.031	0.004	0.008	Bal.

Fig. 1 Schematic of tensile samples clamped with ECP

Fig. 2 Stress-strain curves of GH4169 alloy tensile deformed at 750 °C with different EPC frequencies

Fig. 3 Stress-strain curves of GH4169 alloy tensile deformed at 750 ℃: a, b non-EPC, c, d 40 Hz-EPC

Fig. 4 TEM morphologies of γ′ and γ″ phase of cross section near tensile fracture surface in GH4169 alloy: a non-EPC, b 10 Hz-EPC, c 30 Hz-EPC, d 40 Hz-EPC

Table 2 Size of γ″ phase in cross section near tensile fracture surface in GH4169 alloy with different EPC frequencies

EPC frequency (Hz)	0	10	30	40
Average size of γ″ phase (nm)	4.7	6.1	7.9	27.7

Fig. 5 Size distribution of γ″ phase in cross section near tensile fracture surface in GH4169 alloy: a non-EPC, b 10 Hz-EPC, c 30 Hz-EPC, d 40 Hz-EPC

Fig. 6 SEM morphologies of δ phase of cross section near tensile fracture surface in GH4169 alloy deformed at 750 ℃: a non-EPC, b 40 Hz-EPC

Fig. 7 Dislocation morphologies of cross section near tensile fracture surface in GH4169 alloy: a non-EPC, b 10 Hz-EPC, c 30 Hz-EPC, d 40 Hz-EPC

Fig. 8 Interactions between dislocations and γ″ precipitate by the method of TEM: a dislocations cut γ″ in GH4169 alloy with non-EPC, b dislocations bypass γ″ in the alloy with 40 Hz-EPC

Fig. 9 Mechanism of interactions between atom or precipitate and dislocations in GH4169 alloy: a non-EPC, b 40 Hz-EPC

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