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Title:Research on laser bending process and microstructure for Ti2AlNb rolled sheet
Authors: Jiang Senbao  Wang Yusheng  Chen Yao  Rong Jian  Pu Rongsen  Mao Di 
Unit: (AVIC Chengdu Aircraft Industial (Group) Co. Ltd.  Chengdu 610092  China) 
KeyWords: Ti2AlNb alloy  laser bending  microstructure  shape distortion  bending angle 
ClassificationCode:TG302
year,vol(issue):pagenumber:2024,49(5):61-66
Abstract:

 In order to flexible manufacture the thin-wall Ti2AlNb 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 Ti2AlNb alloy thin sheet, but it needs precise control.

 
Funds:
基金项目:国家博士后基金(2020M670792)
AuthorIntro:
作者简介:姜森宝(1986-),男,博士,工程师 E-mail:jiangsenbao@126.com
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