机电工程技术2026，Vol.55Issue(8)：68-73,6.DOI:10.3969/j.issn.1009-9492.2025.00094
B4Cp/6061Al复合材料中厚板激光焊接工艺
Laser Welding Process Optimization of B4Cp/6061Al Matrix Composite Medium-thick Plates
摘要
Abstract
To address the problems of interface embrittlement and uneven reinforcement particle distribution during laser welding of medium-thick B4Cp/Al composites,the influence mechanism of laser welding parameters on weld microstructure and mechanical properties is investigated based on heat input regulation principles.Through four groups of laser welding experiments with heat inputs ranging from 40 to 70 J/mm,combined with microstructural characterization and mechanical testing,the results showed that:with increasing heat input,the area fraction of B4C particles in all weld regions decreased,with the upper zone showing the most significant reduction,while the lower zone exhibited an abnormal increase at 70 J/mm heat input.The phase distribution evolution demonstrated nonlinear characteristics,where coarse AlB2 phases significantly decreased at 50 J/mm heat input but reformed at 70 J/mm due to overheating.Grain size distribution analysis revealed that the upper zone had the largest average grain size with non-uniform distribution,the middle zone showed the finest grains,while the lower zone exhibited moderate grain size with the most uniform distribution.Mechanical testing indicated that the lower zone consistently outperformed other regions,with optimal joint performance achieved at 4 000 W laser power and 90 mm/s welding speed:the overall average tensile strength almost reached 173 MPa(94.7%of base material strength),with the lower zone achieving 187 MPa,exceeding the base material,and elongation reaching 13.4%.As heat input increased from 50 J/mm to 70 J/mm,the joint strength decreased by approximately 7.3%.This study elucidated the pathway through which process parameters influence joint properties by regulating microstructure,providing crucial theoretical guidance for high-quality joining of medium-thick B4Cp/Al composite plates.关键词
B4Cp/Al复合材料/中厚板/激光焊接/微观组织/力学性能Key words
B4Cp/Al composite/medium-thick plate/laser welding/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
郑凛,孟珍莹,米高阳,张瑞丰..B4Cp/6061Al复合材料中厚板激光焊接工艺[J].机电工程技术,2026,55(8):68-73,6.基金项目
国家重点研发计划(2023YFB4606203) （2023YFB4606203）
