Dissertation > Excellent graduate degree dissertation topics show

6082-T6 aluminum alloy microstructure and mechanical properties of friction stir welding head

Author: HuangFei
Tutor: GongWenBiao
School: Changchun University of
Course: Materials Processing Engineering
Keywords: Friction Stir Welding 6082-T6 aluminum alloy Microstructure Mechanical Properties
CLC: TG453.9
Type: Master's thesis
Year: 2010
Downloads: 218
Quote: 0
Read: Download Dissertation

Abstract


Lightweight high-speed train is the key to improve the overall performance of a significant effect of lightweight aluminum alloy body , the existing fusion welding lead to significant decrease in performance of welded joints , and seriously affect the safety performance of high-speed trains . Performance friction stir welded joints , welding stress and deformation is small , foreign countries have sent their manufactured for high-speed trains aluminum alloy bodywork . FSW 6082-T6 aluminum alloy microstructure and properties have been studied for friction stir welded aluminum alloy bodywork manufacture in China 's high-speed train in order to provide a theoretical and experimental basis . FSW-3LM-003 Gantry friction stir welding welder 3mm thick 6082-T6 aluminum alloy sheet . Connector microstructure analysis showed that the weld nugget occurred dynamic recrystallization , small equiaxed grains ; heat -affected zone are weaker than the the nugget area of thermal machine role in the formation of the bending deformation of the grain ; heat-affected zone only by the frictional heat the impact of grains occurs coarsening become the weakest parts of the whole connector . The mechanical properties of friction stir welded tensile fracture position in the center of the weld heat affected zone at the junction of softening zone or heat-affected zone , the tensile strength of welded joints to achieve 70 % of the parent material ; Fatigue SN test The results show that the aluminum alloy friction stir welded joint fatigue performance superior to the same level of fatigue properties of welded joints . 625 gantry Beijing friction stir welding machine , double-sided welding of 30mm thick 6082-T6 aluminum alloy . Forward and backward side clearly distinguish the forward side of the weld nugget zone and the transition zone boundaries than retreating side significantly , onion ring morphology ; tensile strength of welded joints 197.07MPa is the mother 65.6% of the material tensile strength , the weld joint tensile test showed that most of the cleavage site in the center of the weld region, and not in the region of the base material , this phenomenon may be due to the friction stir welding is not due to the penetration welding ; base material FSW joints fatigue crack source of incomplete penetration site , the fracture fatigue District crack propagation is mainly influenced by the fatigue resistance of the original base metal dendrite morphology whichever combination of cleavage and dimple fracture extended crack propagation is mainly affected by the dislocations the aggregation of product formation of micro-cracks ; the fatigue fracture tensile fracture significantly different , the tensile fracture plastic dimple majority , fatigue fracture of brittle tear the majority .

Related Dissertations

  1. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  2. Research on Welding Characteristics of CO2 Laser-GMA Hybrid Welding for Ultra-Low Carbon Bainitic Steel,TG456.7
  3. Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys,TG146.22
  4. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  5. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  6. The Investigations on the Characteristics and Mechanism of NIR Emission from Bi-doped Silicophosphate Glasses,TQ171.1
  7. Study on the Recycling of Post-Consumer Polyester Textiles,X791
  8. Fabricationand Properties of SiC-AlN Multiphase Ceramics Prepared by Gelcasting,TQ174.62
  9. Synthesis of Polysulfones and Modification for Epoxy Adhesives,TQ433.437
  10. Preliminary Study on Salt-Tolerant Mechanism of the New Pennisetum Purpereum Schumach Variety-Sumu No.2,S543.9
  11. Study on the Fine Structure of Intestine and Intestinal Mucosal Barrier in Zebrfish (Brachydanio Rerio),Q95-33
  12. Study on Characteristics of Morphology Anatomy and Physio-Biochemistry of Two Ecotype Varieties Cucumber Leggy Seedilings,S642.2
  13. Study on the Mechanism of Heat-Induced Gelation of Myofibrillar Proteins,TS251.1
  14. Studies on the Aggregation and Microstructure of Imidazolium Ionic Liquids in Solutions,O645.1
  15. Studies of Luminescence Characteristics of Eu3+-doped Rare Earth Borates REBaB9O16 （RE=rare Earth Ions and Y）,O627.3
  16. Structure and Characterization of Room Temperature Self-crosslinked Acrylonitrile-butadiene-styrene,TQ325.2
  17. The Research on Extrusion Parameters Through the Plate Billet of Magnesium Alloy,TG379
  18. Study on Stock Price Behavior Around Periodical Reports Based on Asymmetric Information,F832.51
  19. Research on Processings and Microstructure and Properties of HRB400MPa,TG335
  20. Study of Performance of Cordierite Combined Mullite Products,TQ175.71
  21. Modification of Talc Powder and Its Reinforcing and Toughening on Recycled Polypropylene,TQ325.14

CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Pressure welding > Other pressure welding
© 2012 www.DissertationTopic.Net  Mobile