Creep anisotropy behavior,deformation mechanism,and its efficient suppression method in Inconel 625 superalloy
作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China Innovation CenterNPU·ChongqingChongqing 401135China AVIC Manufacturing Technology InstituteBeijing 100024China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第133卷第2期
页 面：58-76页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
主 题：Nickel superalloys Creep anisotropy Deformation mechanisms Texture Pre-stress aging
摘 要：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.
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