焊管2025，Vol.48Issue(10)：7-13,7.DOI:10.19291/j.cnki.1001-3938.2025.10.002
电弧增材制造X80钢级大直径三通管件力学性能研究
Investigation on Mechanical Properties of X80 Grade Large-diameter Tee Fabricated by Wire Arc Additive Manufacturing
摘要
Abstract
In view of the challenges associated with conventional manufacturing process(such as casting,welding,and hot extrusion)of large-diameter high.strength tee fittings for oil and gas pipelines,including difficulties in internal quality control,high energy consumption,high cost,and inconsistent mechanical properties—the wire arc additive manufacturing method was fabricated using an X80 grade large-diameter tee fitting.The microstructure,mechanical properties,and influence of specimen geometry were systematically investigated through metallographic analysis,tensile tests,and impact tests at various temperatures.The results show that the microstructures of the arc additive manufacturing tee fitting consist mainlyof acicular ferrite and granular bainite,and the tensile strength is slightly higher than that of conventionally hot-extruded tees.At the same time,the yield ratio is lower,suggesting enhanced safety performance.Round bar tensile specimens can better reflect the real tensile properties of the material than flat specimens,as they are less affected by the Bauschinger effect and work hardening.Impact toughness along the building direction is slightly superior to that along the printing direction,with the difference becoming more pronounced at lower temperatures.Due to stress concentration and melt pool behaviorvariations,the shoulder region exhibits lower impact toughness and a higher ductile-to-brittle transition temperature than the main pipe and branch sections.It provides technical support for the efficient and high-performance manufacturing of large-diameter high-strength pipeline tees and the application of wire arc additive manufacturing in producing fittings for demanding service environments.关键词
电弧增材制造/三通管件/拉伸性能/冲击韧性/拉伸试样形状Key words
wire arc additive manufacturing/tee fitting/tensile property/impact toughness/shape of tensile specimen分类
能源科技引用本文复制引用
严连菊,朱克明,黄枝兵,刘川,卢迪..电弧增材制造X80钢级大直径三通管件力学性能研究[J].焊管,2025,48(10):7-13,7.基金项目
国家重点研发计划项目"飞机起落架再制造硬质涂层制备与构效调控技术"(项目编号2024YFC3908103) （项目编号2024YFC3908103）
广东省基础与应用基础研究基金(区域联合项目-地区培育项目)"超声冲击氧化辅助电弧增材制造组织性能调控机制"(项目编号2022A1515140028). （区域联合项目-地区培育项目）
