摘要
针对铝合金构件在生产或服役过程中出现的大尺寸裂纹或磨损缺肉等问题,提出了连续送丝搅拌摩擦增材再制造方法,设计了由专用送丝装置、静止轴套与螺杆结构搅拌头组成的搅拌摩擦增材再制造工具,实现了高强铝合金板材表面预置宽度10 mm且深度2 mm的凹槽缺陷的有效填充与修复。结果表明:修复件表面成形良好,组织均匀,力学性能良好;通过动态回复和再结晶过程对晶粒进行细化,晶粒尺寸为1.59μm;修复件平均抗拉强度和伸长率分别为(410±8)MPa和(11.9±0.9)%,相较于带缺陷试样分别提高了26%和159%;断口表面具有大量的韧窝,呈典型的韧性断裂特征。
A wire-based friction stir additive remanufacturing(W-FSAR)method is proposed to address large cracks and material loss in aluminum alloy components during production and service.The W-FSAR tools consist of a wire feeding device,a stationary sleeve,and a screw-structured stirring head.This method effectively fills and repairs 10 mm-width and 2 mm-depth groove defects in aluminum alloy components.The results indicate the repaired sample has high repair efficiency,smooth morphology,homogeneous microstructure,and excellent mechanical properties.The dynamic recovery and recrystallization processes refine the grain size to 1.59μm.The ultimate tensile strength and elongation of the repaired samples are(410±8)MPa and(11.9±0.9)%,respectively,which increase by 26%and 159%compared to the worn-out specimens.There are numerous dimples on the fracture surface,exhibiting typical ductile fracture characteristics.
作者
袁靖宇
孟祥晨
陈佳霖
谢聿铭
张欣盟
黄永宪
YUAN Jingyu;MENG Xiangchen;CHEN Jialin;XIE Yuming;ZHANG Xinmeng;HUANG Yongxian(State Key Laboratory of Precision Welding&Joining of Materials and Structures,Harbin Institute of Technology,Harbin 150001,China;Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450046,China;CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China)
出处
《材料工程》
北大核心
2025年第5期85-92,共8页
Journal of Materials Engineering
基金
黑龙江省自然科学基金项目(LH2022E058)
中央高校基本科研业务费专项资金资助(HITDZJJ2023006)。
关键词
搅拌摩擦修复
固相再制造
7A52铝合金
微观组织
力学性能
friction stir repairing
solid state remanufacturing
7A52 aluminum alloy
microstructure
mechanical property
作者简介
通讯作者:黄永宪(1979—),男,教授,博士,研究方向为搅拌摩擦焊接及其衍生技术,联系地址:哈尔滨市南岗区西大直街92号哈尔滨工业大学逸夫楼503室(150001),E-mail:yxhuang@hit.edu.cn。
