Kejie Tan, Jinli Xie, Hailong Qin, Bin Xu, Guichen Hou, Jinguo Li, Zhongnan Bi, Ji Zhang
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引用次数: 0
摘要
提高打印质量是镍基超耐热合金航空发动机复杂零件快速成型制造的关键要求。本文以选择性激光熔化（SLM）镍基超合金为重点，研究了 Co 和 Nb 对裂纹的影响。本文通过改变钴和铌的含量，研究了选择性激光熔炼镍基超合金的溶解温度γ'、裂纹特征、微观结构、热膨胀和机械性能。15Co/0Nb 合金的综合质量最高。Nb 增加了裂纹风险和热变形，而 Co 则加速了应力释放。因此，Co 是提高 SLM 镍基超级合金质量的一种极其重要的合金元素。最后，讨论了裂纹生长动力学和应变差，以揭示 SLM 裂纹受时间或温度影响的规律。通过分析合金元素的影响，可以获得有效的基础理论，指导 SLM 镍基超级合金的成分优化。
Effects of Co and Nb on the Crack of Additive Manufacturing Nickel-Based Superalloys
Increasing the print quality is the critical requirement for the additive manufactured complex part of aero-engines of nickel-based superalloys. A study of the effects of Co and Nb on the crack is performed focusing on the selective laser melting (SLM) nickel-based superalloy. In this paper, the solvus temperature of γ', crack characteristics, microstructure, thermal expansion, and mechanical properties of SLM nickel-based superalloy are investigated by varying the content of Co and Nb. The alloy with 15Co/0Nb shows the highest comprehensive quality. Nb increases the crack risk and thermal deformation, and then Co accelerates the stress release. Therefore, Co is an extremely important alloying element for improving the quality of SLM nickel-based superalloy. Finally, the crack growth kinetics and the strain difference are discussed to reveal the SLM crack regular that is affected by time or temperature. The analysis work on the effect of alloying elements can obtain an effective foundational theory to guide the composition optimization of SLM nickel-based superalloys.
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This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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