Effect of Orientation on Stress-Rupture Property and Related Deformation Microstructure of a Ni-Base Re-containing Single-Crystal Superalloy at 900 °C

doi:10.1007/s40195-020-01131-y

Abstract

Abstract:

Stress-rupture properties of a Ni-base Re-containing single-crystal superalloy with three orientations have been tested under 900 °C/445 MPa. An obvious anisotropy of stress-rupture property is attributed to orientation reliant deformation microstructure. The good strength in [001] orientation is attributed to the rapid multiplication of dislocations active in horizontal channels and later γ’ cutting via dislocations pair coupled with anti-phase boundary. The microtwin formation largely limits the strength and plasticity as a result of the continuous shearing across γ/γ’ microstructure by {111}〈112〉 slip activated in [011] orientation. The property in [111] orientation results mainly from the lateral cross-slip movements of the screw dislocations within connected matrix channels as well as the precipitate shearing by coplanar dislocations. Microcracks all initially originate from the interdendritic micropores in three orientations. The critical temperature of stress-rupture anisotropy could be increased by a high level of refractory solutes especially Re.

Key words: Nickel-base superalloy, Stress-rupture property, Orientation effect, Deformation microstructure, Fracture behavior

Guang-Lei Wang, Jin-Lai Liu, Ji-De Liu, Yi-Zhou Zhou, Xu-Dong Sun, Hai-Feng Zhang, Xiao-Feng Sun. Effect of Orientation on Stress-Rupture Property and Related Deformation Microstructure of a Ni-Base Re-containing Single-Crystal Superalloy at 900 °C[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(5): 719-728.

Figures/Tables 8

Table 1 Composition of the Ni-base SC superalloy (wt%)

Ni	Cr	Co	Al	Ta	W	Mo	Re	C	B	Y
Bal.	6.9	7.5	6.2	6.5	5.0	1.5	3.0	0.05	0.004	0.01

Fig. 1 Orientation dependence of stress-rupture property: a lifetime b elongation

Fig. 2 Larson-Miller curve of several commercial alloys and this Re-containing alloy with three orientations [5, 22, 23]

Fig. 3 SEM micrographs of γ/γ’ microstructure on longitudinal section after rupture: a, b in [001] orientation; c, d in [011] orientation; e, f in [111] orientation; a, c, e near the fracture surface; b, d, f 6 mm away from the fracture surface

Fig. 4 TEM micrographs of dislocation configurations on cross section after rupture: a central bright field and weak-beam dark filed b in [001] orientation; c, d two-beam bright field in [011] orientation; e, f two-beam bright field in [111] orientation

Fig. 5 SEM micrographs of fracture surfaces in three orientations: a, b [001] orientation; c, d [011] orientation; e, f [111] orientation; a, c, e in low magnification; b, d, f in high magnification

Fig. 6 Schematic drawing of single screw interfacial dislocations bowing out within the neighboring matrix channels and transforming into the dislocation loops

Fig. 7 Schematic drawing of critical temperature of stress-rupture anisotropy as a function of the refractory solute content [5, 22, 23]

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