Dissertation > Excellent graduate degree dissertation topics show

Effect of Adding ZrO 2 Nanopowder on Microstructure and Mechanical Properties of Carbon Steel

Author: AnJing
Tutor: LiShengLi
School: Liaoning University of Science and Technology
Course: Materials Processing Engineering
Keywords: ZrO2 Nanopowder Grain Refinement Microstructure Mechanical Properties
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 8
Quote: 0
Read: Download Dissertation

Abstract


Grain refinement is one of the important means to improve strength and toughness of iron and steel materials. By second-phase particles was dispersed evenly into liquid steel to add deformation center. The method of grain refining consist of internal precipitation method and external addition method. This paper study target is carbon section , by external adding ZrO2 nanopowder to realize refine of grain.ZrO2 nanopowder was prepared by liquid sedimentation method. Grain size is 40nm50nm. This paper mainly studies the influence of adding different quality fraction（0.1%,0.3%,0.5%,0.7%,0.9%） ZrO2 nanopowder on microstructure and mechanical properties of carbon steel.Test of steel in the same condition of smelting and rolling deformation, The grain refinement mechanism and its mechanical Properties were investigated by a series of analysis techniques such as optical microscope（OM）, scanning electron microscope（SEM） and tensile performance test in detail.The conclusions of the present dissertation are as follows:（1） ZrO2 nanopowder evenly into liquid steel by pre-dispersed method of the nano-particles;（2） the ZrO2 nanopowder were used as deformation center and recrystallization in liquid steel casting solidification process and the rolling deformation proces- -s,compared with original steel,the grain become finer;（3）The quality fraction of ZrO2 nanopowder is 0.3%, the steel grains were fined to 7.46μm, mechanical properties increased, the yield strength and tensile strength of 218.14Mpa and 401.31Mpa respectively.The integrating mechanical properties of the steel are increased obviously.

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. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. The Investigations on the Characteristics and Mechanism of NIR Emission from Bi-doped Silicophosphate Glasses,TQ171.1
  6. Study on the Recycling of Post-Consumer Polyester Textiles,X791
  7. Fabricationand Properties of SiC-AlN Multiphase Ceramics Prepared by Gelcasting,TQ174.62
  8. Synthesis of Polysulfones and Modification for Epoxy Adhesives,TQ433.437
  9. Study on the Fine Structure of Intestine and Intestinal Mucosal Barrier in Zebrfish (Brachydanio Rerio),Q95-33
  10. Study on the Mechanism of Heat-Induced Gelation of Myofibrillar Proteins,TS251.1
  11. Studies on the Aggregation and Microstructure of Imidazolium Ionic Liquids in Solutions,O645.1
  12. Studies of Luminescence Characteristics of Eu3+-doped Rare Earth Borates REBaB9O16 （RE=rare Earth Ions and Y）,O627.3
  13. Structure and Characterization of Room Temperature Self-crosslinked Acrylonitrile-butadiene-styrene,TQ325.2
  14. The Research on Extrusion Parameters Through the Plate Billet of Magnesium Alloy,TG379
  15. Study on Stock Price Behavior Around Periodical Reports Based on Asymmetric Information,F832.51
  16. Preparation of Surface-functionalized Graphene and Its Influence on the Mechanical Properties of Nanocomposite Materials,TB332
  17. Research on Structure and Mechanical Property of Hook and Loop Fastener,TE931.2
  18. Rolled Mg-Zn-Ce-Zr (Mn) alloy microstructure and mechanical properties of,TG339
  19. Simulated lunar ambient temperature magnesium alloy microstructure and mechanical properties of,TG146.22
  20. Shanghai Comprehensive Test of mechanical properties of clay and constitutive modeling,TU411.3

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile