Effects of selective laser melting process parameters on the fatigue strength and material characteristics of tungsten carbide/inconel 718 composites

IF 4.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Haichuan Shi , Yang Chu , Peilei Zhang , Zhishui Yu , Hua Yan , Qinghua Lu
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Abstract

Tungsten Carbide (WC)-reinforced Inconel 718 (IN718) composites were prepared by Selective Laser Melting (SLM) technique. The impact of SLM production on WC/IN718 composites was studied to analyze densities, microstructure evolution, tensile properties, and fatigue properties under various process parameters. The effect of parameters on composite densities and powder melting was analyzed by a combination of experimental and simulation methods. In the matrix, the WC particles are dispersed uniformly, and there is a reaction between the WC particles and the matrix to form a good interfacial reaction layer. As the laser energy density increases, the surface of the WC particles melts under high energy density laser irradiation, leading to the diffusion of decomposed W and C atoms into the matrix. Two typical carbides, W2C and (M, W)C (M for Ni, Cr, Nb, Fe), form sequentially at a distance from the WC grains. At a laser energy density of 89.94 J/mm3, the tensile strength and microhardness of the composites reach the maximum values of 1203 MPa and 403 HV. This is a composite strengthening mechanism resulting from the WC and carbide strengthening phases. The incorporation of WC particles significantly improves the fatigue resistance of the composites compared to IN718. Fatigue fracture is in the form of quasi-dissociation fracture, with fatigue originating from pores and incompletely fused defects on the surface. The fatigue extension zone is characterized by riverine and fatigue streaks. This study offers a theoretical foundation and guidance on enhancing the mechanical properties of nickel-based superalloys and broadening their potential applications in the future.
选择性激光熔化工艺参数对碳化钨/铬镍铁合金718复合材料疲劳强度和材料特性的影响
采用选择性激光熔化法制备了碳化钨(WC)增强Inconel 718 (IN718)复合材料。研究了SLM生产对WC/IN718复合材料的影响,分析了不同工艺参数下WC/IN718复合材料的密度、组织演变、拉伸性能和疲劳性能。采用实验和模拟相结合的方法,分析了各参数对复合材料密度和粉末熔化的影响。在基体中,WC颗粒均匀分散,WC颗粒与基体之间发生反应,形成良好的界面反应层。随着激光能量密度的增加,WC颗粒表面在高能量密度激光照射下熔化,导致分解的W和C原子扩散到基体中。两种典型碳化物W2C和(M, W)C (M为Ni, Cr, Nb, Fe)在离WC晶粒一定距离处依次形成。当激光能量密度为89.94 J/mm3时,复合材料的抗拉强度和显微硬度分别达到1203 MPa和403 HV的最大值。这是碳化钨强化相和碳化物强化相的复合强化机制。与IN718相比,WC颗粒的掺入显著提高了复合材料的抗疲劳性能。疲劳断裂为准离解断裂,疲劳源自表面气孔和未完全熔合的缺陷。疲劳延伸带以河流和疲劳条纹为特征。本研究为进一步提高镍基高温合金的力学性能,拓宽其应用前景提供了理论基础和指导。
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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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