High-temperature oxidation behavior of SLM-processed and forged GH5188 Co-based superalloy

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI:10.1016/j.smmf.2025.100093

Chao Yang , Xue Chen , Yusheng Tian , Yifeng Tang , Shiping Cai , Wei Wei , Qianli Huang , Hang Guo , Aihui Huang , Paul K. Chu

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Abstract

The high-temperature oxidation behavior of GH5188 cobalt-based superalloy, fabricated via selective laser melting (SLM) and forging, is investigated to elucidate the impact of additive manufacturing on oxidation resistance. SLM-processed samples exhibit a hierarchical microstructure with nanoscale carbides (∼80 nm) pinned at cellular boundaries (100 nm to micrometer scale), contrasting with the equiaxed grains (∼10 μm) and coarse W-rich M₆C carbides (∼5 μm) in forged samples. After isothermal oxidation at 1000 °C and 1100 °C for 200 h, SLM samples show significantly lower mass gains compared to forged samples (69 % and 75 % of forged values), attributed to enhanced oxide scale adhesion and stability. Cyclic oxidation at 1000 °C for 50 cycles reveals stable mass gains in SLM samples (37 % of forged value) with minimal cracking, while forged samples suffer severe spallation due to volatile WO₃ formation from coarse carbides. This study demonstrates that SLM's refined microstructure suppresses deleterious carbide decomposition, offering a novel strategy to enhance the oxidation resistance of Co-based superalloys for aerospace and high-temperature applications.

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slm加工锻造GH5188钴基高温合金的高温氧化行为

研究了选择性激光熔化（SLM）和锻造制备的GH5188钴基高温合金的高温氧化行为，以阐明增材制造对抗氧化性能的影响。slm处理的样品显示出层次化的微观结构，纳米级碳化物（~ 80 nm）固定在细胞边界（100 nm至微米尺度），与锻造样品中的等轴晶粒（~ 10 μm）和粗富w M6C碳化物（~ 5 μm）形成对比。在1000°C和1100°C等温氧化200小时后，SLM样品的质量增益明显低于锻造样品（锻造值的69%和75%），这归因于增强的氧化垢附着力和稳定性。在1000°C下循环氧化50次，SLM样品的质量稳定增加（锻造值的37%），开裂最小，而锻造样品由于粗碳化物挥发性WO3形成而严重剥落。该研究表明，SLM的精细组织抑制了有害碳化物的分解，为提高航空航天和高温应用中co基高温合金的抗氧化性提供了一种新的策略。

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Smart Materials in Manufacturing

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