Dissertation > Excellent graduate degree dissertation topics show

The Impact of Heat Treatment on Residual Stress from P92 Pipes Girth Weld

Author: ZhangJianLi
Tutor: JingHongYang
School: Tianjin University
Course: Materials Processing Engineering
Keywords: heat treatment residual stress P92 steel finite element
CLC: TG156
Type: Master's thesis
Year: 2009
Downloads: 50
Quote: 2
Read: Download Dissertation

Abstract


With the rapid development of the economics of China, the demand for electricity increased, and in our country power generation mainly depends on thermal power at this stage. In order to meet the requirements of electricity, speeding up the development of thermal power technology is very important. Thermal power technology put new demands on improving the materials. For this reason, many countries have developed the steel P92. At present P92 steel in China is widely used.The P92 steel is mainly used for large-diameter thick-walled pipes. The structural rigidity and the restraint stress are great, and a greater internal welding residual stress will emerge in the pipe. These factors affect the strength of steel, stiffness, fatigue strength, fracture properties and anti-stress corrosion. PWHT can reduce the hardness of the regions of the welded joint, improving the toughness of welded joint and removing the welding stress. In order to analysis of the P92 steel welding performance and mechanical properties after welding accurately, developing a reasonable welding process and post-weld heat treatment process, it is imperative to carry out finite element simulation.In this paper, the distribution of the residual stress is measured by X-ray diffraction method, which from the outer surface of welded joints before and after the heat treatment. Based on the measured results, the impact of heat treatment on residual stress is researched. And the finite element software is used for numerical simulation of heat treatment process. The stress field is calculated by using the load transfer method. First of all, a finite element model is established. Metal cladding and heat source moving are achieved in welding process, using "birth and death" of ANSYS and the features of function and the array. After obtaining the temperature field, the thermal elements are converted to the structure elements. Then, the stress field is calculated. Simulation results show that much of the residual stress is eliminated after heat treatment. Simulated value is basically same with measured value.

Related Dissertations

  1. Research on the Mainframe System of Powder Mixed EDM and the Craft Experiment,TG661
  2. Study of Mechanism Using Two-Direction Pre-Stress to Control Welding Distortion and Hot Cracking,TG404
  3. EDM Electrode Wear Mechanism and Control Research,TG661
  4. Research on the Structure and Characteristics of Permanent Magnetic Coupling,TH139
  5. Finite Element Analysis and Structure Optimal Design for Combined Seal at Normal Temperature and Low Temperature,TH136
  6. Simulation Analysis on Temperature Stress of RCC Arch Dam and Its Construction Joints Design Research,TV642.2
  7. Simplified Analysis of Semi-Rigid Steel Frames under Vertical Loading,TU391
  8. Based on Nonliner Finite Element Analysis of the Infilled Wall Frame Structure,TU323.5
  9. Stability Analysis of Roller Compacted Concrete Gravity Dam Based on Time-history Method,TV642.2
  10. Study on the Design and Biomechanical Behaviors of Individualized Artificial Knee Joint,R318.1
  11. Design of Testing Equipment for Electronic Products,TN06
  12. S-lay Installation Analysis for Deepwater Pipeline,TE973
  13. Research on Intelligent Aerial Bomb for Forest Fire Fighting,S762
  14. Study on Key Technology and Its Physiological Basis of Virus Elimination and Rapid Propagation of Phalaenopsis,S682.31
  15. Multi-pin Internal Fixation of Calcaneal Fractures in Finite Element Analysis,R687.3
  16. The Analysis and Comparison of Adjacent Segment Degeneration of the Finite Element Caused by Three Posterior Lumbar Fusion Style,R687.3
  17. The Establishment and Preliminary Application of the Three-dimensional Finite Element Model of Ankle Joint,R687.3
  18. Different Bottom Structure of Dental Brackets Affect the Adhesiveness-Three Dimensional Finite-element Analysis,R783.5
  19. Airborne radar antenna pedestal rapid design systems research and development,TN959.73
  20. Sham hose drum drive means and hydraulic system of the structure,TE973
  21. The magnetorheological damper mechanical properties and Gun Recoil,TB535.1

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process
© 2012 www.DissertationTopic.Net  Mobile