کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8947702 | 1645603 | 2018 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heterogeneous γⲠmicrostructures in nickel-base superalloys and their influence on tensile and creep performance
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
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چکیده انگلیسی
Mechanical properties of nickel-base superalloys can be greatly influenced by spatial variation of γⲠmicrostructure, calling for models at mesoscale to study additional complexity in the underlying microstructure/property relationship. We combine a FFT-based elasto-viscoplasticity (FFT-EVP) model with a phase-field (PF) model to study plastic deformation of γ/γⲠsuperalloys. The model is applied to Haynes 282 (H282), where the low volume fraction (<20%) of dispersed spherical γⲠparticles results in a dislocation-particle interaction of either Orowan looping at tensile conditions or climb-bypass at creep conditions. The incorporation of these mechanisms is achieved through the framework of a dislocation density based constitutive model in FFT-EVP, together with the introduction of a location-dependent inter-particle spacing based on the k-nearest neighbor algorithm. Features of non-uniform γⲠmicrostructures, including γⲠvolume fraction variation and non-uniform γⲠdistribution due to element microsegregation observed in welded H282 samples, are modeled using the PF method and then passed to FFT-EVP to explore their influence on the tensile and creep properties in a parametric manner. It is found that if the particle distribution is uniform, γⲠvolume fraction variation can exhibit a nonlinear effect on both the tensile strength and creep rate; for a given overall γⲠvolume fraction, the degree of particle distribution non-uniformity can also exhibit nonlinear influence on the tensile strength and creep rate. It is also shown that the location-dependent inter-particle spacing serves as a better microstructure descriptor than the conventional analytical expression of the average inter-particle spacing in terms of establishing a homogenized but microstructure-sensitive constitutive microstructure-property relationship for fast-acting engineering applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 109, October 2018, Pages 153-168
Journal: International Journal of Plasticity - Volume 109, October 2018, Pages 153-168
نویسندگان
Pengyang Zhao, Chen Shen, Stephen R. Niezgoda, Yunzhi Wang,