Selective Laser Melting of Carbon-Free Mar-M509 Co-Based Superalloy: Microstructure, Micro-Cracks, and Mechanical Anisotropy

Wang, Xiaodong; Chen, Chaoyue; Zhao, Ruixin; Liu, Longtao; Shuai, Sansan; Hu, Tao; Wang, Jiang; Ren, Zhongming

doi:10.1007/s40195-021-01348-5

Cited by 9 publications

(1 citation statement)

References 21 publications

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“…Nowadays, selective laser melting (SLM) that uses a highenergy laser beam as a heat source to melt metal powder line by line and layer by layer according to a path modeled and sliced by 3D software to directly form the dense metal parts, is a kind of promising additive manufacturing technology [7][8][9][10][11]. It has been recognized that the SLM technology breaks through the limitations of traditional manufacturing technologies (i.e., casting and powder metallurgy) and Available online at http:// link.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Graphene Reinforced K418 Superalloy by Selective Laser Melting

Luo

Chen

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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In order to obtain the superalloy with excellent properties, graphene reinforced K418 nickel base superalloy (GNPs/K418 composite) was prepared by selective laser melting technique in this study. Through systematically comparing and analyzing the microstructure and mechanical property of K418 superalloy and GNPs/K418 composite, it is found that the percentage of small-diameter grain (≤ 15 μm) increased from 84% to 90%, and the max strength of grain orientation (<001>) reduce from 5.76 to 4.17 due to the addition of GNPs. And GNPs can also improve the height and the full width at the half peak of the strong diffraction peak of GNPs/K418 composite. Besides, GNPs/K418 composite is a kind of sandwiched structure, which is consist of GNPs, carbides, and K418 matrix. Therefore, the hardness of the GNPs/K418 composite is 4.1% and 6.9% higher than that of the K418 matrix in the transverse and vertical direction, respectively. The room temperature tensile strength of the GNPs/K418 composite is 9% higher than that of the K418 matrix. And the 600 °C and 900 °C tensile strengths of the GNPs/K418 composite are 7.6% and 10.4% higher than that of the K418 matrix, respectively. It is inferred that the effect of graphene on K418 matrix strengthening is mainly fine grain strengthening and Orowan strengthening. However, the elongation rate of the composite material is reduced, which is attributed to crack sprouting at the interface between the matrix and GNPs under high stress.

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