Dissertation > Excellent graduate degree dissertation topics show

Research on Melted Generated Phases Representation and Heat Treatments Influence and Mechanical Properties of Heat-resistant Steel C12A

Author: HanPeiChun
Tutor: YaoXiuRong
School: Harbin University of Science and Technology
Course: Materials Science
Keywords: Heat-resistant steel C12A Thermodynamic Analysis Heat treatment High Temperature Tensile
CLC: TG161
Type: Master's thesis
Year: 2010
Downloads: 42
Quote: 0
Read: Download Dissertation

Abstract


The C12A heat-resistant steel is a heat - resistant high-alloy cast steel, and served in the high-temperature and high-pressure environment , used in the manufacture of ultra (ultra) supercritical thermal power units in the cylinder , high pressure valves , and other key components . Depth study of this steel , its early localization , has a very important significance to the development of our ultra ( ultra ) supercritical thermal power units . C12A heat-resistant steel balance precipitation thermodynamic analysis calculated system C12A heat-resistant steel Fe -Cr -Ni - VC five yuan carbide Gibbs free energy ; C12A heat-resistant steel cast microstructure analysis and mechanical properties at room temperature testing ; research C12A heat-resistant steel microstructure and properties of different heat treatment processes and different tempering temperature ; 550 ° C from 600 ° C , 650 ° C , from 700 ° C under the conditions of high temperature tensile test and scan the high temperature mechanical properties of the fracture , research steel . The results show that : Thermodynamic calculations show that when the temperature is higher than 1785 K , in the of five yuan lines of Fe-Cr-Ni-VC , after the in C12A steel melted into a melt , the precipitated phase Cr 23 < / sub> C < sub> 6 ΔG lowest Cr 7 C 3 < / sub > , followed by melt generated Cr 23 C 6 < / sub > Cr 7 C 3 < / sub > VC precipitated phase . Liquid iron , it will have to generate a small amount of cementite matrix precipitated phase Cr 23 C 6 , of Cr the 7 C 3 , Fe 3 C, VC and other phase . The C12A steel cast structure of lath martensite , has good mechanical properties at room temperature ; different heat treatment processes impact on the the C12A steel microstructure and mechanical properties , microstructure and properties of of normalizing high temperature tempered ; tempering temperature affect the C12A steel mechanical properties important factors tempering temperature is too low , the lath martensite Reply inadequate ; tempering temperature , into the two-phase region , partial austenitizing 760 < sup > ℃ 7 90 ℃ is the optimum temperature tempering . C12A has good resistance to softening steel at high temperatures significantly higher than in the same temperature stainless steel and carbon steel , high tensile strength and ductility , fracture scanning analysis , fracture of steel at high temperatures for ductile fracture .

Related Dissertations

  1. Study on the Subsurface Crack of Supporting Roller Made of Austempered Ductile Iron,TG156.3
  2. The Design and Implementation of Control System for Wire-steel Heat Treatment Direct-fired Furnace,TP273
  3. Study on Process Method and Parameter Optimization of the Remained-heat Treatment of Marine Heavy Forgings,TG316
  4. Study on Synthesis and Modified of LiFePO4 as Cathode Materials,TM912
  5. 316LN austenitic stainless steel stress corrosion cracking of welded joints,TG407
  6. Influence of Heat Treatment on Nickel-base Single Crystal Superalloy Containing Re,TG166
  7. Heat Treatment of Cast Al-Cu-Ti-(La) alloy microstructure and mechanical properties of,TG166.3
  8. Semi-solid / hot extruded hypereutectic Al-Fe alloy heat Mechanism,TG166.3
  9. Hot extruded Mg-Zn-Zr-Gd alloy microstructure and mechanical properties,TG379
  10. GH4169G alloy creep behavior of the organizational structure and,TG146
  11. Mg-Zn alloy microstructure and mechanical properties,TG146.22
  12. ZA35 alloy elements Zr on Microstructure and Properties,TG131
  13. Heat Treatment on biodegradable PBST elastic fibers and degradation properties,TQ340.1
  14. Based on the configuration king and Matlab trolley furnace control system design,TP277
  15. Study of the Annealing Treatments of Electrodeposited CuInSe2 and Cu（In,Ga）Se2 Thin Films,TB43
  16. The Effect of Direct Electric Resistance Heat Treatment on the Mechanical Properties of Orthodontic NiTi Archwires,R783.5
  17. Study on the Metabolic Characteristic of Physiological and Biochemical in Fresh-cut Carrot,TS255.3
  18. Research on Microstructure Evolution in Pre-heat Treatment and Cold Ring Rolling,TG142.15
  19. Study on High Strength Al-Cu Alloy’s Rare Earth Modification Techniques and Their Influences on Alloy’s Micro/Macro-structure and Properties,TG166
  20. Mg-7Gd-3Y-0.4Zr alloy microstructure and properties of,TG146.22
  21. Ti62421s high temperature properties of titanium Organization,TG132.32

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