Study of gamma ' rafting under different stress states - A phase-field simulation considering viscoplasticity

doi:10.1016/j.jallcom.2018.07.317

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	Study of gamma ' rafting under different stress states - A phase-field simulation considering viscoplasticity
	Yang, M ; Zhang, J ; Wei, H 1,2; Zhao, Y 3; Gui, WM ; Su, HJ ; Jin, T 2; Liu, L
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-11-15
卷号	769 页码:453-462
关键词	Superalloys gamma ' rafting Shear creep Phase-field model Plasticity
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.07.317
英文摘要	The gamma'/gamma evolution in nickel superalloys under different stress states and stress values at 1223 K was simulated through the phase-field method to study the 45 degrees-type rafting mechanism and the influence of orientation deviation on the gamma'/gamma evolution. The simulation results demonstrate that for the shear stress case, 45 degrees-type rafting appears under the external shear stress of 137 MPa. In 45 degrees-type rafting, the equivalent stress inhomogeneity in the gamma channel induces a directional diffusion of gamma'-forming elements into the low-equivalent-stress areas which are distributed along the diagonal directions. Based on the simulations, a model for the 45 degrees-type rafting mechanism has been proposed. In addition, the influence of orientation deviation on gamma'/gamma evolution originates from the introduction of shear stress components. With increasing external stress, the shear stress component is increased, which causes the rafting direction to approach the 45 degrees direction. Furthermore, the existence of orientation deviation accelerates the process of gamma' rafting. (C) 2018 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000449481200054
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79820]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China 2.Zhejiang Univ, Ctr Centrifugal Hypergrav Res, Hangzhou 310058, Zhejiang, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Liaoning, Peoples R China 4.Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China
推荐引用方式 GB/T 7714	Yang, M,Zhang, J,Wei, H,et al. Study of gamma ' rafting under different stress states - A phase-field simulation considering viscoplasticity[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,769:453-462.
APA	Yang, M.,Zhang, J.,Wei, H.,Zhao, Y.,Gui, WM.,...&Liu, L.(2018).Study of gamma ' rafting under different stress states - A phase-field simulation considering viscoplasticity.JOURNAL OF ALLOYS AND COMPOUNDS,769,453-462.
MLA	Yang, M,et al."Study of gamma ' rafting under different stress states - A phase-field simulation considering viscoplasticity".JOURNAL OF ALLOYS AND COMPOUNDS 769(2018):453-462.