Microstructure characteristics and surface oxidation behaviour of SLM WC/IN718 composite

IF 1.9 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Powder Metallurgy Pub Date : 2021-12-10 DOI:10.1080/00325899.2021.2014649

Yanlin Wang, L. Zhuo, Min Liu, Z. An, Chao Li, E. Yin, Jinwen Lu, X. Gong

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引用次数: 1

Abstract

ABSTRACT In this work, WC/Inconel 718 composite was fabricated by selective laser melting (SLM) the IN718 superalloy powders decorated with surface embedded WC powders. Also, the composite was heat-treated by a designed double-aging regime for microstructure tuning. The resulting microstructure and surface oxidation behaviour of the as-printed and the heat-treated composites were studied. The results revealed that the homogeneous microstructure was obtained, and the obvious weld beads structure with fine dendrites was detected on the surface in the SLM composite. After the double-aging heat treatment, the matrix showed a confined growth from 21.81 to 26.14 μm and the weld bead structure disappeared. XRD and EBSD analysis confirmed the formation of γ, γ′, γ′′, WC, (Nb,M)C, δ and Laves phase in the composites before and after heat-treatment. The high-density GND accommodated the strain incompatibility and the internal residual stress in different constituents. Furthermore, the underlying mechanism of oxidation behaviour was discussed.

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SLM WC/IN718复合材料的显微组织特征及表面氧化行为

在IN718高温合金粉末表面包埋WC粉末，采用选择性激光熔覆法制备WC/Inconel 718复合材料。同时，通过设计的双时效机制对复合材料进行热处理，以实现微观组织调谐。研究了打印态和热处理态复合材料的微观结构和表面氧化行为。结果表明:SLM复合材料的微观组织均匀，表面存在明显的细枝晶焊缝珠状组织;双时效热处理后，基体由21.81 μm局限生长至26.14 μm，焊缝组织消失。XRD和EBSD分析证实，复合材料热处理前后形成了γ、γ′、γ”、WC、(Nb,M)C、δ和Laves相。高密度GND能够适应不同成分的应变不相容和内部残余应力。此外，还讨论了氧化行为的潜在机理。

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来源期刊

Powder Metallurgy 工程技术-冶金工程

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3 months

期刊介绍： Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.