Effect of Major Alloying Elements on Fluidity and Mechanical Properties of K477 Superalloy

XIA Xingyi; ZHENG Hang; ZHANG Weiwei; WANG Lianbo; YI Chushan; LEI Sixiong; ZHU Guoliang; TAN Qingbiao

doi:10.3969/j.issn.1674-6457.2025.09.016

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (9) : 167-175. DOI: 10.3969/j.issn.1674-6457.2025.09.016

Superalloy Forming

Effect of Major Alloying Elements on Fluidity and Mechanical Properties of K477 Superalloy

XIA Xingyi¹, ZHENG Hang², ZHANG Weiwei², WANG Lianbo^1,*, YI Chushan², LEI Sixiong², ZHU Guoliang³, TAN Qingbiao^3,*

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Abstract

The work aims to comparatively study the microstructure, mechanical properties and castability of two kinds of K477 alloys with different compositions, to provide experimental evidence and theoretical support for the development of a K477 alloy composition with superior overall performance. The solidification characteristic temperature of the two alloys were determined with the differential scanning calorimetry (DSC). The microstructures were observed with an optical microscope (OM). The high-temperature mechanical properties were measured by tensile test, and the fracture morphologies were observed with a scanning electron microscope (SEM). The filling ability was finally evaluated with a spiral fluidity-testing model. Compared with the low-alloyed K477 alloy, the solidification temperature range of the high-alloyed K477 alloy was reduced by 10.20 ℃, and the mass fractions of MC, M₃B₂, and γ′ phases increased. The tensile strength and yield strength of the high-alloyed K477 alloy at 650 ℃ reached 1 023 MPa and 823 MPa, respectively, which were approximately 35% and 19% higher than those of the low-alloyed K477 alloy. Furthermore, the filling length of the 2 mm thin-walled section reached 8.1 mm, representing a 68.75% improvement compared to the low-alloyed one. The major alloying elements in the K477 superalloy determine the solidification characteristic temperature, microstructures, mechanical properties and castability. By optimizing the proportion of major alloying elements, it is possible to achieve a combination of good fluidity and mechanical properties.

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superalloy / alloying composition / microstructure / mechanical properties / fluidity

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XIA Xingyi, ZHENG Hang, ZHANG Weiwei, WANG Lianbo, YI Chushan, LEI Sixiong, ZHU Guoliang, TAN Qingbiao. Effect of Major Alloying Elements on Fluidity and Mechanical Properties of K477 Superalloy[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 167-175 https://doi.org/10.3969/j.issn.1674-6457.2025.09.016

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