The out-of-plane deformation is a serious problem in thin-plate welded joint,and it is difficult to reduce or control the distortion during welding process. External restraint is regarded as an effective method to mit...The out-of-plane deformation is a serious problem in thin-plate welded joint,and it is difficult to reduce or control the distortion during welding process. External restraint is regarded as an effective method to mitigate the distortion,and it is widely used in the actual manufacturing process. In order to investigate the influence of external restraint on welding deformation in thin plate joints,a thermo-elastic-plastic finite element method based on ABAQUS software was developed to calculate welding-induced deformation. Meanwhile,welding deformation in the thin-plate joints was measured by experiments.Through comparing the numerical results with the measured data,the effectiveness of the developed computational approach was verified. Based on the simulated and experimental results,the generation mechanism of the out-of-plane deformation in thin plate bead-on joint was discussed,and the influence of external restraint on the final welding deformation was clarified.展开更多
The dynamic recrystallization refinement of magnesium alloy AZ80 by compression tests was studied,and its effect on the mechanical properties was investigated.It is observed that the microstructure of the as-cast bill...The dynamic recrystallization refinement of magnesium alloy AZ80 by compression tests was studied,and its effect on the mechanical properties was investigated.It is observed that the microstructure of the as-cast billet with grain size of 240μm becomes refined to about 120,110,94 and 50μm after upsetting at 350℃ under strain rates of 0.01,0.1,1 and 10 s -1 respectively.The changes in the mechanical properties according to grain size show that yield strength significantly decreases with grain size increasing,while strain hardening exponent and micro hardness increase very sharply.Further,the grain size vs strain rate and change in Vickers micro hardness according to the various strain rates show that grain size and micro hardness decrease with strain rate increasing.展开更多
基金supported by Chongqing Municipal Science and Technology funded projects(Projected No.CSTC 2010BB4060)
文摘The out-of-plane deformation is a serious problem in thin-plate welded joint,and it is difficult to reduce or control the distortion during welding process. External restraint is regarded as an effective method to mitigate the distortion,and it is widely used in the actual manufacturing process. In order to investigate the influence of external restraint on welding deformation in thin plate joints,a thermo-elastic-plastic finite element method based on ABAQUS software was developed to calculate welding-induced deformation. Meanwhile,welding deformation in the thin-plate joints was measured by experiments.Through comparing the numerical results with the measured data,the effectiveness of the developed computational approach was verified. Based on the simulated and experimental results,the generation mechanism of the out-of-plane deformation in thin plate bead-on joint was discussed,and the influence of external restraint on the final welding deformation was clarified.
基金Project(cstc2009aa3012-1)supported by Science and Technology Committee of Chongqing,ChinaProject(20100470813)supported by China Postdoctoral Science FoundationProject(2010011511)supported by Sharing Fund of Chongqing University’s Large-Scale Equipment,China
文摘The dynamic recrystallization refinement of magnesium alloy AZ80 by compression tests was studied,and its effect on the mechanical properties was investigated.It is observed that the microstructure of the as-cast billet with grain size of 240μm becomes refined to about 120,110,94 and 50μm after upsetting at 350℃ under strain rates of 0.01,0.1,1 and 10 s -1 respectively.The changes in the mechanical properties according to grain size show that yield strength significantly decreases with grain size increasing,while strain hardening exponent and micro hardness increase very sharply.Further,the grain size vs strain rate and change in Vickers micro hardness according to the various strain rates show that grain size and micro hardness decrease with strain rate increasing.
