Dissertation > Excellent graduate degree dissertation topics show

Process Design of Super-low-carbon Stainless Steel Lower Ring in Runner

Author: ShenWeiJun
Tutor: WangYaNan；GaoYuanQi
School: Liaoning University of Science and Technology
Course: Materials Engineering
Keywords: technological design Solidification Simulation deformation control heat treatment
CLC: TH162
Type: Master's thesis
Year: 2007
Downloads: 62
Quote: 0
Read: Download Dissertation

Abstract


The structural characteristics of the Lower Ring in the Runner for the Right Bank of Three Gorge Power Station are introduced in this paper. Particular attention is shown to the cause of elliptical deformation. Through this analysis, process control parameters are established in order to minimize the volume of the elliptical deformation. The result is the production of consistent castings able to meet both the machining requirements, and the quality specified in the technical standard. On the technological design side, after statistically analyzing the dimensions of previously produced lower ring castings reasonable technological parameters, such as casting yield and machining allowance are summarized. In order to assist the directional solidification, a step gating system and insulated feeders are used, and simulation is made by Huazhu CAE. This simulation showed the internal quality met the detection requirement after examining the liquid-phase solidification and shrinkage and dispersed shrinkage. On the melting side, duplex melting with arc furnace and ladle refining, decreases the content of carbon, sulphur and nitrogen This results in a chemistry that meets the standard requirement. In addition, by monitoring the process over the series of castings, the melting times were able to be shortened. On the heat treatment side , blue annealing+ normalization+ secondary temper was used. A normalizing temperature of 1050℃, primary drawing temperature of 650℃, and secondary drawing temperature of 600℃were used. The resulting microstructure was a mix of stable martensite and definite numbers of inverse austenite This resulted in the mechanical properties meeting the standard requirement with an optimal balance between strength and plasticity.

Related Dissertations

  1. Study on Key Technology and Its Physiological Basis of Virus Elimination and Rapid Propagation of Phalaenopsis,S682.31
  2. The Workshop Process Design of the Soy Poly-peptides,TS214.2
  3. Study on the Subsurface Crack of Supporting Roller Made of Austempered Ductile Iron,TG156.3
  4. The Research on Rolling and Heat Treatment Technology of AZ31 Magnesium Alloy Thin Sheet,TG166.4
  5. Effect of Heat Treatment and Alloy Composition on Microstructure and Properties of Wear-resistant Casting Steel,TG142.4
  6. Development of Cr-Mo Alloy Steels for Liner Applications and Assessment of Its Wear Resistance,TG335.5
  7. Research on Composite Hard Anodic Oxidation of Aluminum Alloys and Mechanism,TG174.44
  8. Effect of Ag and Er on Microstructures and Properties of Al-Mg-Si-Cu Alloys,TG146.21
  9. Study on the Properties of PLA Filament and Its Mixed Fabrics,TS101.923
  10. Study on Extrusion and Heat Treatments of AJ and AE Series Cast Magnesium Alloys,TG166.4
  11. Study Continuous Glass Fiber Reinforced Polypropylene by Two-step Pultrusion,TQ327.11
  12. Research on Microstructures and Properties of Modified A356 Aluminum Alloy in Lost Foam Casting Process,TG249.5
  13. Studies on the Structure and Hydrogen Storage Properties of La-Mg-Ni System AB3.0-3.5 Type Alloys,TG139.7
  14. Study on the Structure and Properties of Electrical Brush Planting Ni-P/Al2O3 Coating Aftering Heat Treatment,TQ153
  15. Technology Design on Five Million M ~2 /a Silane Surface Treatment for Steel,TG174.44
  16. Machining complex manufacturing systems - heat integrated scheduling method,TH186
  17. Heat Treatment of Cast Al-Cu-Ti-(La) alloy microstructure and mechanical properties of,TG166.3
  18. Hot extruded Mg-Zn-Zr-Gd alloy microstructure and mechanical properties,TG379
  19. GH4169G alloy creep behavior of the organizational structure and,TG146
  20. ZA35 alloy elements Zr on Microstructure and Properties,TG131
  21. Effect of Rolling Process on Fatigue Behavior of TC4-DT Alloy Sheets,TG115

CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Process design
© 2012 www.DissertationTopic.Net  Mobile