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.35 Crmnsi High Strength Low Alloy Steel Electron Beam Welding Residual Stress Measurement And Simulation

Posted on:2006-12-31Degree:MasterType:Thesis
Country:ChinaCandidate:L H LiFull Text:PDF
GTID:2191360212466312Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
The material commonly applied in aviation industry, 35CrMnSi low-alloy high strength steel was used in the experiments. The microstructure and mechanical properties of 35CrMnSi steel electron beam welded (EBW) joints on two kinds of thickness (2mm and 10mm) were analyzed respectively. The welding residual stress of the steels on two kinds of thickness were measured respectively by using through-hole-drilling method and blind-hole-drilling method. And making use of ANSYS non-line finite element procedure, the residual stresses field of 35CrMnSi steel electron beam welded joints on two kinds of thickness plates were simulated by three-dimensional finite-element method. The results of experiment and calculation were compared. In order to analyzed the distribution characteristics and formation mechanics of residual stress in EBM , which has important theoretical value and realism meaning.The main research work is introduced as following:1. The microstructure of 35CrMnSi steel EBW joints on two kinds of thickness were studied, the results show that the microstructure of the EBW welds is coarse needle martensite and a small amount of residual austenite; the main structures of heat affected zones are lath-shaped martensite and a small amount of residual autenite; the microstructures of base metal are ferrite and pearlite.2. The hardness of each zone of 2mm plate are almost consistent with 10mm plate, the hardness of the weld is higher than HAZ, and the hardness of HAZ is higher than base metal. By EBW, the plasticity of 35CrMnSi steel welded joints on two kinds of thickness (2mm and 10mm) is lower than that of base metal; strength of welded joints was measured, the results show: strength of 2mm welded joints is lower than that of base metal and strength of 10mm welded joints is higher than that of base metal; the change is closely related to the microstructure of each zone of the joint. It was founded that ballistic toughness of 35CrMnSi steel weld was lower than that of base metal by blow-test.3. The residual stress of 35CrMnSi steel EBW joints on two kinds of thickness (2mm and 10mm) were measured respectively by using through-hole-drilling method and blind-hole-drilling method, the result show that in the weld centre, the maximum magnitude of residual tensile stress is lower than its yield strength, and the magnitude of...
Keywords/Search Tags:Electron beam welding, 35CrMnSi low alloy high strength steel, Microstructure, Residual stresses, Finite element analysis
PDF Full Text Request
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