On the Influence of Alloy Composition on the Additive Manufacturability of Ni-Based Superalloys

高温合金 材料科学 可制造性设计 开裂 差示扫描量热法 合金 应力松弛 延展性(地球科学) 蠕动 冶金 复合材料 热力学 机械工程 物理 工程类
作者
Joseph N. Ghoussoub,Yuanbo T. Tang,William J B. Dick-Cleland,André A. N. Németh,Yilun Gong,D.G. McCartney,A.C.F. Cocks,Roger C. Reed
出处
期刊:Metallurgical and Materials Transactions [Springer Science+Business Media]
卷期号:53 (3): 962-983 被引量:32
标识
DOI:10.1007/s11661-021-06568-z
摘要

Abstract The susceptibility of nickel-based superalloys to processing-induced crack formation during laser powder-bed additive manufacturing is studied. Twelve different alloys—some of existing (heritage) type but also other newly-designed ones—are considered. A strong inter-dependence of alloy composition and processability is demonstrated. Stereological procedures are developed to enable the two dominant defect types found—solidification cracks and solid-state ductility dip cracks—to be distinguished and quantified. Differential scanning calorimetry, creep stress relaxation tests at 1000 °C and measurements of tensile ductility at 800 °C are used to interpret the effects of alloy composition. A model for solid-state cracking is proposed, based on an incapacity to relax the thermal stress arising from constrained differential thermal contraction; its development is supported by experimental measurements using a constrained bar cooling test. A modified solidification cracking criterion is proposed based upon solidification range but including also a contribution from the stress relaxation effect. This work provides fundamental insights into the role of composition on the additive manufacturability of these materials.

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