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Creep anisotropy behavior,deformation mechanism,and its efficient suppression method in Inconel 625 superalloy

Journal of Materials Science & Technology 2023年第2期133卷 58-76页

作者： Xudong Liu Jiangkun Fan Kai Cao Fulong Chen Ruihao Yuan Degui Liu Bin Tang Hongchao Kou Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Innovation Center NPU·ChongqingChongqing 401135China AVIC Manufacturing Technology Institute Beijing 100024China

Mill products,such as sheets,usually show obvious anisotropy in their mechanical properties,which greatly affects both their applications and *** this study,the orientation-dependent tensile and creep behaviors of Inconel 625 alloy sheets with weak local textures were systematically investigated at 650°*** results showed that Inconel 625 superalloy exhibits nearly isotropic tensile properties;how-ever,obvious creep anisotropy appears when loading along different *** life in the rolling direction(150±5 h)was approximately 4.5 times longer than in the transverse direction(33±1 h).Se-vere creep anisotropy was found to be determined by two aspects:(i)the change in deformation mecha-nisms along the rolling direction(a combination of boundary sliding,dislocation slipping,and twinning)and the transverse direction(dislocation slipping).Stronger impingement of slip bands on grain bound-aries accelerated intergranular crack initiation and propagation during loading along the transverse direc-tion,which resulted in a short creep life.(ii)The differences in strain compatibility at grain boundaries(i.e.,creep loading along the transverse direction resulted in the initial grains forming strong Brass,Cu,and S textures).Creep cracks preferentially nucleated at the junctions between Cu/Brass texture grains,as these interfaces exhibit the worst strain compatibility(Luster-Morris parameter m≤0.22).Furthermore,pre-stress aging(PSA)treatment is proposed as an efficient method to suppress creep *** discrepancy rate of creep life was found to be reduced by nearly 50%after PSA treatment.

关键词： Nickel superalloys Creep anisotropy Deformation mechanisms Texture pre-stress aging

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