Dissertation > Excellent graduate degree dissertation topics show

Study on Microstructure Evolution and Properties of TC11 Titanium Alloy during High Temperature Deformation Process

Author: CuiXiPing
Tutor: GengLin
School: Harbin Institute of Technology
Course: Materials Science
Keywords: TC11 Titanium Heat treatment Numerical Simulation High temperature deformation
CLC: TG146.23
Type: Master's thesis
Year: 2008
Downloads: 119
Quote: 0
Read: Download Dissertation

Abstract


Deformation temperature and deformation after heat treatment of TC11 Titanium organization has great influence on the mechanical properties and are very sensitive to their organizations at different temperatures of TC11 titanium alloy high temperature compression, and compression material taken two cooling method for air-cooled and water quenched, solution and aging of the material and double annealing treatment. The study of heat treatment on hot compression deformation of the material impact of the microstructure and mechanical properties. At the same time, due to the β forging process plastic deformation resistance, good product hot strength and fracture toughness of advantages, high temperature molding the test temperature election in temperature above the phase transition point, focus on a different reduction of high temperature TC11 Titanium organizations forming evolution and use of the numerical simulation method to simulate the high temperature molding process of particle flow rule, effective strain distribution of the changes in the temperature field and molding characteristics. Compressive deformation in the temperature range of 900oC ~ 1050oC TC11 titanium alloy heat treatment test results show: With the compression temperature increases Organization from elongated equiaxed transition to the two-state organizations to lamellar structure. The tensile strength of the best, but the lowest elongation after aging treatment. The compression then TC11 titanium alloy in the temperature below the phase transition point after double annealing, the material static recrystallization axis tissue increased; temperature above the phase transition point compression, double annealing heat treatment can increase the α-pin width to length ratio and to reduce the α domain, so the compression after double annealed material of high ductility and high strength, good mechanical properties. Especially 1000oC compressed double annealing the material elongation highest of, and also higher strength, the best mechanical properties. Numerical simulation of high-temperature deformation test results show that: the For with an extruded way, earlier than first filling the metal to form a rigid area, after forming smaller effective strain; over after filling the alloy, the effective strain larger. TC11 titanium alloy in the forward extrusion process, the effective strain reached 0.269 before the work hardening phenomenon gradually after dynamic soften. The evolution of organizations in the anti-extrusion process is similar to the forward extrusion process just microstructure evolution at different rates. And to establish a quantitative relationship between the positive and negative extrusion effective strain and hardness. β forging high temperature forming tests: The results show that as the amount of deformation increases, the β crystal grains along the direction of the metal filling deformed elongated grain boundary generating portion crushing, deformation mainly intergranular localized deformation in the crushing of the grain The sector has a small amount of dynamic recrystallization, but then the amount of deformation is increased, the dynamic recrystallization region increased and accompanied by part of the grain coarsening.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  6. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  7. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  8. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  9. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  10. Numerical Simulation of Biomass Direct Reburning,TK16
  11. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  12. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  13. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  14. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  15. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  16. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  17. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  18. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3
  19. Analysis of the Impact of Tailings Dam Stability under Seepage Role,TV649
  20. Study on Hydraulic Fracturing of Low Permeability Reservoir,P618.13
  21. Numerical Simulation and Experimental Study of Air-Assisted Sprayer of Orchard,S491

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Titanium
© 2012 www.DissertationTopic.Net  Mobile