湖南大学学报（自然科学版）2026，Vol.53Issue(4)：71-80,10.DOI:10.16339/j.cnki.hdxbzkb.2026171
涡轮叶片用K418B高温合金SLM工艺优化与性能研究
Process optimization and performance investigation of SLM for a K418B nickel-based superalloy in turbine blade applications
摘要
Abstract
This study systematically investigates the optimization of selective laser melting(SLM)process parameters for K418B nickel-based superalloy to enhance its mechanical properties.The effects of key parameters,such as laser power and scanning speed,on the density,microstructure,and mechanical performance of the fabricated parts were explored.The optimal process window was determined by characterizing and quantifying micro-defects in samples prepared with various volumetric energy densities(Ev).Furthermore,the intrinsic relationship between process parameters,microstructure evolution,and mechanical properties was revealed through EBSD analysis and in-situ tensile testing.The results demonstrate that a relative higher density exceeding 99.6%can be consistently achieved when the Ev is below 60 J/mm³,effectively suppressing defects like pores and cracks.Within the optimal process window of Ev=40～50 J/mm³,the alloy exhibited excellent comprehensive mechanical properties,with its yield strength,ultimate tensile strength,and elongation reaching 780 MPa,875 MPa,and 2.5%,respectively.This work confirms that optimizing SLM process parameters to minimize micro-defects is crucial for improving the performance of the K418B alloy.关键词
涡轮叶片/增材制造/K418B/镍基高温合金/工艺参数优化/微观缺陷Key words
turbine blade/additive manufacturing/K418B/nickel-based superalloy/process parameter optimi-zation/microstructural defects分类
矿业与冶金引用本文复制引用
米栋,李博川,李学攀,熊伟,廖望望,李加强,钱正明,龙湘云,姜潮..涡轮叶片用K418B高温合金SLM工艺优化与性能研究[J].湖南大学学报（自然科学版）,2026,53(4):71-80,10.基金项目
国家自然科学基金资助项目(52175134,52475155),National Natural Science Foundation of China(52175134,52475155) （52175134,52475155）
湖南省优秀青年基金资助项目(2023JJ20010),Excellent Youth Fund of Hunan Province(2023JJ20010) （2023JJ20010）
湖南省科技创新计划资助项目(2024RC3097),Hunan Science and Technology Innovation Plan(2024RC3097) （2024RC3097）
中国航空产学研合作项目(HFZL2022CXY007),Industry-Academia-Research Cooperation Project(HFZL2022CXY007) （HFZL2022CXY007）
广东省自然科学基金资助项目(2024A1515010684),Guangdong Natural Sciences Foundation(2024A1515010684) （2024A1515010684）
