On the formation of microstructural gradients in a nickel-base superalloy during electron beam melting

被引：51

作者：

Deng, Dunyong ^{[1
]}

Peng, Ru Lin ^{[1
]}

Soderberg, Hans ^{[2
]}

Moverare, Johan ^{[1
]}

机构：

[1] Linkoping Univ, Dept Management & Engn, Div Engn Mat, SE-58183 Linkoping, Sweden

[2] Sandvik Machining Solut AB, SE-81181 Sandviken, Sweden

来源：

MATERIALS & DESIGN | 2018年 / 160卷

关键词：

Electron beam melting; Inconel; 718; Laves; Solidification; In-situ annealing; Thermal history; SITE-SPECIFIC CONTROL; INCONEL; 718; MECHANICAL-PROPERTIES; LAVES PHASE; DELTA-PHASE; SOLIDIFICATION; PRECIPITATION; TI-6AL-4V; ORIENTATION; KINETICS;

D O I：

10.1016/j.matdes.2018.09.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electron beam melting (EBM) is one of the most widely used additive manufacturing (AM) methods for metallic components and has demonstrated great potential to fabricate high-end components in the aerospace and energy industries. The thermal condition within a melt pool and the complicated thermal cycles during the EBM process are of interest but not yet well-understood, and will significantly affect the microstructural homogeneity of as-manufactured nickel-base superalloy components. To establish the thermal profile evolution during electron beam melting of nickel-base superalloys, Inconel 718 (IN718) is manufactured and characterized in the as-manufactured condition, on account of its representative segregation and precipitation behaviours. The microstructure gradient within a build, specifically the Laves phase volume fraction evolution, is rationalized with the solidification condition and the following in-situ annealing. Precipitations of carbide/nitride/carbonitride, delta and gamma'/gamma '' are also discussed. Hardness is measured and correlated to the Laves phase volume fraction evolution and the precipitation of gamma'/gamma ''. The results of this study will (i) shed light on microstructure evolution during the EBM process with regard to thermal history; and (ii) deepen the current understandings of solidification metallurgy for additive manufacturing of Ni-base superalloys. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：251 / 261

页数：11

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