Microstructure Evolution of a Multimodal Gamma-Prime Ni-Based Superalloy Characterized by In Situ Diffraction

被引:2
|
作者
Awais, Muhammad [1 ]
Hixson, William R. [1 ]
Victor, Quinton [1 ]
O'Neal, Callahan [1 ]
Ilavsky, Jan [2 ]
Coakley, James [1 ]
机构
[1] Univ Miami, Dept Mech & Aerosp Engn, Coral Gables, FL 33146 USA
[2] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2023年 / 54卷 / 06期
关键词
LATTICE STRAIN EVOLUTION; SINGLE-CRYSTAL; NICKEL; TEMPERATURE; MISFIT; CREEP; BEHAVIOR; PRECIPITATION; DEFORMATION; RELAXATION;
D O I
10.1007/s11661-023-07013-z
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The relationship between the evolution of microstructure, deformation micromechanisms and mechanical properties is difficult to establish in multimodal size distribution gamma ' superalloys, as the microstructure evolves with both temperature and time, and multiple strengthening mechanisms across each size distribution contribute to mechanical performance. In situ X-ray scattering can offer unparalleled insight regarding microstructure evolution at the temperatures and stresses of importance to gas-turbine applications; however, in situ X-ray diffraction has not been applied to the study of multimodal gamma ' distribution superalloys. Herein, lattice parameter evolution of secondary and tertiary gamma ' precipitates in a representative superalloy, Nimonic 115, is determined between 750 degrees C and 950 degrees C and correlated to room-temperature SEM and microhardness values. A large positive lattice parameter misfit of secondary gamma ' induces precipitate splitting, and the tertiary gamma ' goes into dissolution at similar to 800 degrees C, but with little apparent change in hardness values. The volume fraction of gamma ' decreases above 900 degrees C and precipitate-matrix coherency is lost, and there is a corresponding decrease in microhardness values. The diffraction analysis demonstrates the capability to determine critical microstructural parameters of both precipitate size distributions in situ, representing an additional tool for determining microstructure-mechanical property relationships of multimodal superalloys.
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页码:2311 / 2319
页数:9
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