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您的检索式：作者名="FangjunLIU"
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| 1 | 3D Finite Element Numerical Simulation of Residual Stresses on Electron Beam Welded BT20 Plates显示文摘A three-dimensional finite-element model (FEM) used for calculating electron beam (EB) welding temperature and stresses fields of thin plates of BT20 titanium has been developed in which the nonlinear thermophysical and thermo-mechanical properties of the material has been considered. The welding temperature field, the distributions of residual stresses in aswelded (AW) and electron beam local post-weld heat treatment (EBLPWHT) conditions have been successfully simulated.The results show that: (1) In the weld center, the maximum magnitude of residual tensile stresses of BT20 thin plates of Ti alloy is equal to 60%~ 70% of its yield strength σs. (2) The residual tensile stresses in weld center can be even decreased after EBLPWHT and the longitudinal tensile stresses are decreased about 50% compared to joints in AW conditions. (3)The numerical calculating results of residual stresses by using FEM are basically in agreement with the experimental results.Combined with numerical calculating results, the effects of electron beam welding and EBLPWHT on the distribution of welding residual stresses in thin plates of BT20 have been analyzed in detail. | LixingHUO FurongCHEN YufengZHANG LiZHANG FangjunLIU GangCHEN | 2004 | Journal of Materials Science & Technology2004，20，1： | 5 |
| 2 | Effect of Post-weld Heat Treatment on Microstructure and Fracture Toughness of 30CrMnSiNi2A Steel Welded Joints显示文摘The electron beam local post-weld heat treatment (EBLPWHT) is a rather new method that provides the advantages ofhigh precision, flexibility and efficiency, energy saving and higher productivity. This paper studies the effect of two post-weldheat treatment processes on the microstructure, mechanical properties and fracture toughness of an electron beam weldedjoints in 30CrMnSiNi2A steel. EBLPWHT, in a vacuum chamber, immediately after welding and a traditional furnace wholepost-weld heat treatment (FWPWHT) were compared. The experimental results show that, after EBLPWHT treatment, themain microstructure of weld was changed from coarse acicular martensite into lath martensite, HAZ was changed from lathmartensite, bainite into lower bainite, and base metal was changed from ferrite and pearlite into upper bainite and residualaustenite. The microstructures of different zones of joints in FWPWHT condition were tempered sorbite. The properties ofwelded joints can be improved by the EBLPWHT in some extent, and especially largely for the fracture toughness of weldedjoints. However the value of fracture toughness of base metal is comparatively low, so appropriate heat treatment parametersshould be explored in the future. | LixingHUO FurongCHEN YufengZHANG LiZHANG FangjunLIU GangCHEN | 2003 | Journal of Materials Science & Technology2003，19，5： | 0 |
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