caa a22 4500 463222067 CHVBK 20180405153215.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-007-1524-y doi (NATIONALLICENCE)springer-10.1007/s10853-007-1524-y Effect of laser beam welding on fracture toughness of a Ti-6.5Al-2Zr-1Mo-1V alloy sheet [Elektronische Daten] [Yaowu Shi, Fei Zhong, Xiaoyan Li, Shuili Gong, Li Chen] Investigation of fracture toughness on Ti-6.5Al-2Zr-1Mo-1V alloy thin sheet and its laser-welded joints has been carried out. In the test compact tension (CT) specimens and single specimen technology were used. In addition, hardness distribution and microstructure of the welded joints were examined. Fracture test indicates that brittle unstable fracture occurs after slow crack propagation for all the specimens, except that one heat affected zone (HAZ) specimen is brittle crack initiation. It is found that rolling directions have no obvious effect on fracture toughness of base metal. Moreover, fracture toughness of weld metal is obviously decreased in comparison with base metal whatever in as-welded condition or in stress relief condition. Post-weld heat treatment (PWHT) leads to fracture toughness of the welds further decreasing. Fractography observation shows that the fracture mode is predominantly dimpled in base metal. However, there exists intergranular fracture in the weld metal. Thus, the transition of fracture mode from both base metal and HAZ to weld metal may lead to dramatic decrease in fracture toughness. Microstructure examination reveals that the microstructure of weld metal consists of large grains with fine acicular structure. The formation of fine α acicular structure is due to rapid cooling during laser welding. After PWHT, the acicular structure is coarsened. Springer Science+Business Media, LLC, 2007 Shi Yaowu School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, 100022, Beijing, P.R. China aut Zhong Fei School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, 100022, Beijing, P.R. China aut Li Xiaoyan School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, 100022, Beijing, P.R. China aut Gong Shuili State Defence Key Laboratory For High Energy Density Beam Processing Technology, Beijing Aeronautical Manufacturing Technology Research Institute, 100024, Beijing, P.R. China aut Chen Li State Defence Key Laboratory For High Energy Density Beam Processing Technology, Beijing Aeronautical Manufacturing Technology Research Institute, 100024, Beijing, P.R. China aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/16(2007-08-01), 6651-6657 0022-2461 42:16<6651 2007 42 10853 https://doi.org/10.1007/s10853-007-1524-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1524-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shi Yaowu School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, 100022, Beijing, P.R. China aut NATIONALLICENCE 700 1- Zhong Fei School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, 100022, Beijing, P.R. China aut NATIONALLICENCE 700 1- Li Xiaoyan School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, 100022, Beijing, P.R. China aut NATIONALLICENCE 700 1- Gong Shuili State Defence Key Laboratory For High Energy Density Beam Processing Technology, Beijing Aeronautical Manufacturing Technology Research Institute, 100024, Beijing, P.R. China aut NATIONALLICENCE 700 1- Chen Li State Defence Key Laboratory For High Energy Density Beam Processing Technology, Beijing Aeronautical Manufacturing Technology Research Institute, 100024, Beijing, P.R. China aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/16(2007-08-01), 6651-6657 0022-2461 42:16<6651 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer