Ti2AlNb轧板激光弯曲工艺及微观组织研究  

Research on laser bending process and microstructure for Ti_2AlNb rolled sheet

作　　者：姜森宝 王宇盛 陈瑶 荣建 蒲容森 毛迪 Jiang Senbao;Wang Yusheng;Chen Yao;Rong Jian;Pu Rongsen;Mao Di(AVIC Chengdu Aircraft Industial(Group)Co.,Ltd.,Chengdu 610092,China)

机构地区：[1]航空工业成都飞机工业(集团)有限责任公司,四川成都610092

出　　处：《锻压技术》2024年第5期61-66,共6页Forging & Stamping Technology

基　　金：国家博士后基金(2020M670792)。

摘　　要：为柔性制造Ti2AlNb合金薄壁弯曲零件,研究了激光弯曲工艺参数对弯曲角度和微观组织的影响规律。通过不同激光功率、扫描速度、扫描道次、扫描路径和试样宽度等工艺参数下的激光弯曲实验,对比分析了弯曲样件的成形质量及微观组织。结果表明:当试样宽度为40 mm时,在激光束半径为0.3 mm、激光功率为0.4 kW和扫描速度为1.0 m·min^(-1)下,单道次弯曲角度达3.3°;随着扫描道次的增加,弯曲角度近线性增加,8次扫描后的弯曲角度为18°;侧向偏移直线扫描路径与直线扫描路径趋势近似,但弯曲圆角较大,S曲线扫描路径会导致弯曲试样形状畸变;小光斑直径激光弯曲的微观组织类似于激光焊接,包括熔化区、热影响区和母材区,材料的维氏硬度从母材区到熔化区呈下降趋势。因此,激光弯曲成形是一种对Ti2AlNb合金薄板局部弯曲的有效加工方法,但需要精确控制。In order to flexible manufacture the thin-wall Ti_2AlNb alloy thin wall bent parts,the influences of laser bending process parameters on the bending angles and microstructure were studied,and the forming quality and microstructure of the bent samples were compared and analyzed by laser bending experiments with different laser powers,scanning rates,scanning passes,scanning paths and sample widthes.The results show that when the sample width is 40 mm,the laser beam radius is 0.3 mm,the laser power is 0.4 kW and the scanning rate is 1.0 m·min^(-1),the bending angle under single scanning pass reaches 3.3°.With the increasing of scanning pass,the bending angle increases almost linearly,and the bending angle after eight times scanning is 18°.The lateral offset linear scanning path is similar to the trend of the liner scanning path,but the bending fillet is larger,and the S-curve scanning path causes distortion in the shape of the bent sample.The microstructure of laser bending with small spot diameter is similar to that of laser welding,which includes the melting zone,heat affected zone and base material zone,and the Vickers hardness of the material decreases from the base material zone to the melting zone.Thus,laser bending is an effective processing method for local bending of Ti_2AlNb alloy thin sheet,but it needs precise control.

关 键 词：Ti2AlNb合金 激光弯曲 微观组织 形状畸变 弯曲角度 

分 类 号：TG302[金属学及工艺—金属压力加工]