Deformation Mechanisms Rationalisation to Design for Creep Resistance in Polycrystalline Ni-Based Superalloys

被引：7
作者：
Barba, D. [1 ,2 ]
Egan, A. [3 ,4 ]
Utada, S. [1 ]
Gong, Y. [1 ,6 ]
Tang, Y. T. [1 ]
Mazanova, V. [3 ,4 ]
Mills, M. J. [3 ,4 ]
Reed, R. C. [1 ,5 ]
机构：
[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX13PH, England
[2] Univ Politecn Madrid, ETS Ingn Aeronaut & Espacio, Plaza Cardenal Cisneros 3, Madrid 28040, Spain
[3] Ohio State Univ, Ctr Electron Microscopy & Anal, Columbus, OH 43212 USA
[4] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA
[5] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX13PJ, England
[6] Max Planck Inst Eisenforschung, D-40237 Dusseldorf, Germany
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2023年 / 54卷 / 05期
基金：
美国国家科学基金会;
关键词：
PHASE-TRANSFORMATION; CO-BASE; SEGREGATION; DISLOCATIONS; FAULTS;
D O I：
10.1007/s11661-022-06922-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Creep strength in polycrystalline Ni-based superalloys is influenced by the formation of a rich variety of planar faults forming within the strengthening y' phase. The lengthening and thickening rate of these faults - and therefore the creep rate - depends on an intriguing combination of dislocation interactions at the y -y' interface and diffusional processes of the alloying elements at the core of the fault tip. The effect of alloy composition on this process is not fully understood. In this work we use correlative high resolution transmission electron microscopy and energy-dispersive X-ray spectroscopy to study the deformation faults in two different Ni-based superalloys with carefully designed ratios of disordering-to-ordering -promoting elements (Co-Cr against Nb-Ta-Ti). The results show that the additions of ordering-promoting elements reduce the diffusional processes required for the faults to lengthen and thicken thus reducing the creep rates found for the higher Nb-Ta-Ti alloy. These insights provide a path to follow in the design of improved grades of creep-resistant polycrystalline alloys beyond 700 degrees C.
引用
收藏
页码：1886 / 1901
页数：16
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