Microstructural investigations for laser welded joints of Ti-22Al-25Nb alloy sheets upon large deformation at elevated temperature

被引：37
作者：
Kong, Beibei [1 ]
Liu, Gang [1 ,2 ]
Wang, Dongjun [1 ]
Wang, Kehuan [1 ]
Yuan, Shijian [1 ,2 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 90卷
关键词：
Ti-22Al-25Nb; Laser beam welding; Lattice distortion; Texture; Recovery; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; TENSILE PROPERTIES; HOT DEFORMATION; BETA-PHASE; EVOLUTION; RECRYSTALLIZATION; BEHAVIOR; NB;
D O I：
10.1016/j.matdes.2015.11.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to provide reference for the gas forming of Ti-22Al-25Nb alloy tube blanks with a laser beam welded joint, microstructure and tensile deformation behavior of the alloy with a joint were investigated using uniaxial tensile tests at 990 degrees C, with a tensile speed of 0.016 mm/s. Both of the samples with a longitudinal joint and a transverse joint were applied in the tensile tests. The longitudinal joint samples showed a better high temperature deformability than the transverse joint ones, which partly attributed to the decrease of alpha(2)-phase grains along the beta/B2-phase grain boundaries and more dynamic recovery and discontinuous dynamic recrystallization in the longitudinal joint. These results indicated that the laser welded joint could experience a large deformation at a proper temperature and strain rate, which was a potential method for the preparation of tube blanks for gas forming components. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：723 / 732
页数：10
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