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Beijing University of Science and Technology Designs γ′-Strengthened Co-Ni Base Superalloy
2026-05-27
A research team from Beijing University of Science and Technology developed an alloy design strategy combining machine learning and the CALPHAD method to address the high residual stress and crack sensitivity challenges of additively manufactured superalloys. This approach comprehensively considers microstructure stability, printability, oxidation resistance, density, and mechanical properties. The study successfully developed a γ′-strengthened Co-Ni base superalloy, which achieved crack-free components with relative density exceeding 99.9% via selective laser melting on an unheated substrate. It also demonstrated a superior strength-ductility balance compared to existing high γ′ volume fraction additively manufactured superalloys. The research indicates that γ′-strengthened Co-Ni base superalloys, with a narrower solidification range and lower γ′ solvus temperature than nickel-based alloys, are more suitable for additive manufacturing.
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北科大设计出γ′强化Co-Ni基超合金
北京科技大学研究团队，针对增材制造高温合金高残余应力、高裂纹敏感性难题，开发了将机器学习与CALPHAD方法相结合的合金设计策略，综合考虑了微观结构稳定性、打印性、抗氧化性、密度和力学性能。该研究成功开发的γ′强化Co-Ni基高温合金，在未预热基板上通过选区激光熔化制备无裂纹部件，相对密度超过99.9%，且强度与延展性平衡优于现有高γ′体积分数增材制造高温合金。研究指出，γ′强化Co-Ni基高温合金相比镍基合金具有更窄的凝固范围和更低的γ′溶解温度，更适合增材制造。