Effects of WC Addition on the Microstructure and Mechanical Properties of Inconel 625 Alloys Fabricated by Laser Powder Bed Fusion

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-01-18 DOI:10.1007/s12540-024-01882-8

L. T. Pan, F. L. Shen, T. J. Ma, C. C. Li, W. H. Xin, X. Y. Fang

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Abstract

The addition of WC to metallic materials has been proved to be an effective way to improve the mechanical strength using fusion-based additive manufacturing, such as laser power-bed fusion (LPBF). What happened to WC particles is a key to understand it role in the strengthening mechanism during LPBF. This study investigated the whereabout of WC powders when in-situ added to IN625 alloys and its effect on the microstructure and mechanical properties of the samples fabricated by LPBF. It was found that there are basically three whereabouts of WC: decomposed products of C and W₂C, remained WC, and dissolved WC. The former significantly promotes nanoprecipitation along the solidification cellular boundaries, which is coincident with dislocation walls. The addition of WC refined the size of solidification cells and grains, and weaken the columnar morphology of the grain as well. The yield strength for the samples when added 5% and 10% WC reaches 763.2 MPa and 1038.7 MPa, respectively. WC particles play an indirect role in improving strength via decomposition of WC and promoting nano-precipitate along cellular boundaries. Among the various strengthening mechanisms, nano-precipitation becomes predominant as WC increase, which accounts for 41.6% of the increment in yield strength.

Graphical abstract

Abstract Image

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WC添加对激光粉末床熔合Inconel 625合金组织和力学性能的影响

在金属材料中添加WC已被证明是提高金属材料机械强度的有效方法，如激光动力床熔融（LPBF）。WC颗粒的变化是了解其在LPBF强化机制中的作用的关键。研究了原位添加WC粉末到IN625合金中的去向及其对LPBF法制备试样显微组织和力学性能的影响。发现WC的去向基本有三种：C和W2C的分解产物、剩余WC和溶解WC。前者显著地促进了凝固胞界的纳米沉淀，这与位错壁相一致。WC的加入细化了凝固组织和晶粒的尺寸，削弱了晶粒的柱状形态。WC添加量为5%和10%时，试样的屈服强度分别达到763.2 MPa和1038.7 MPa。碳化钨颗粒通过碳化钨的分解和促进沿细胞边界的纳米沉淀来间接提高强度。在各种强化机制中，随着WC的增加，纳米析出占主导地位，占屈服强度增量的41.6%。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.