Dissertation > Excellent graduate degree dissertation topics show

Effects of Bath Annealing Process on Microstructure and Mechanical Properties of Cold-Rolling Steel Sheet SPCC

Author: YinHongGuo
Tutor: ChenZhenHua
School: Hunan University
Course: Materials Processing Engineering
Keywords: CSP Process SPCC cold rolled plate Bell-type annealing Organization Punchability
CLC: TG335.55
Type: Master's thesis
Year: 2009
Downloads: 380
Quote: 4
Read: Download Dissertation

Abstract


SPCC cold rolled steel sheet is widely used in household appliances, automobiles, doors and other manufacturing industries as well as for hot-dip galvanized substrates, etc., in the proportion of the share of cold-rolled products and market demand are larger. However, in order to CSP hot rolled plate production, there is the high yield strength, low elongation, stamping poor performance and other issues. Current studies are focused on reducing the yield strength of CSP hot plate on; This paper SPCC cold rolled sheets were simulated batch annealing, recrystallization mechanisms were studied at different annealing conditions and their microstructure and mechanical properties of the changes , the results showed that: CSP LIANGANG SPHC hot rolled ferrite average grain size of 12μm, the yield strength of less than 300MPa, for use as a cold-rolled base material; the hot-rolled sheet steel beads ZJ330B better plasticity, cold rolled annealed sheet high yield strength, suitable for hot-rolled state suppliers. SPHC as raw material in the production of cold rolled SPCC hardening phenomenon seriously, even as high yield strength 990MPa, plastic poor. 0.5mmSPCC recrystallization temperature is about 560 ℃, recrystallization temperature range of 520 ℃ ~ 600 ℃, affect the recrystallization temperature of the main factors for the cold rolling reduction rate and the heating rate. SPCC after 680 ℃ ~ 700 ℃ annealed grain size of about 35μm, but not high enough grain pie; 750 ℃ ??annealed coarse ferrite grains and no free cementite precipitation. As the annealing temperature, the strength and yield ratio gradually decreased, while the elongation at 680 ℃ and 700 ℃ annealed up to the maximum. When the holding time is longer, through a single holding time to reduce the effect of the yield strength decreased. LIANGANG plan grades for CQ grade SPCC after 680 ℃ and 700 ℃ annealed IE maximum value, rm values ??greater than 1.5, the performance met the DDQ-deep drawing steel requirements. SPCC annealed sheets ReL, IE value and the value of rm more sensitive to the heating rate, while elongation basically does not change with the heating rate. The speed I, II, III annealed sheet DDQ have reached the performance level, and by the rapid heating speed IV and V after annealing was fine equiaxed grains, nm, and rm values ??lower grade products used only as CQ . Annealing the same conditions, the reduction rate of 75% of the maximum degree of thin grain pie, with the plate thickness increases, the intensity values ??of yield ratio and the work hardening exponent nm showed no change in the law, and the elongation performance a certain regularity, SPCC cold rolling reduction by 75% of the rate of post-annealed sheet with excellent overall tensile properties. In addition, the use of single and double step annealed tensile properties of tissues and small differences can cancel the transition temperature of 400 ℃ and 550 ℃ insulation platform. The results also show that the carbon content of 0.05% in the annealed sheet SPCC free cementite distribution chain mainly from sheet-like cementite in pearlite spheroidization; the intragranular ferrite dispersed carbides cementite is three; SPCC below the critical temperature and annealing, the precipitation of cementite were not exceeded, the drawability of the sheet will not cause damage.

Related Dissertations

  1. The Study on Characteristics and Governance of Crimes Related to Gangs,D917
  2. Study on the Relationship of the High School Teachers Team Psychological Empowerment, Organizational Citizenship Behavior with Team Performance,G443
  3. Knowledge Workers in the Public Sector Probe into Incentive Mechanism,F272.92
  4. An Empirical Research on University Teachers’ Effectiveness and Its Influcing Factors,G645.1
  5. Learning about college counselors Construction,G641
  6. Rural Collective Economic Organization Members Subject Qualification of Legal Research,D922.1;F321.32
  7. A Study on Veranda and Pavilion of Jangnan Garden,TU986.1
  8. The Research of the Grass-roots Party Organization’s Building Guided by the Ensuring and Improving of People’s Livelihood,D267
  9. "United Nations Convention against Transnational Organized Crime" and Improvement of China’s Criminal Legislation on the Organized Crime,D917
  10. The Study of Legislation about Organization, Leadership Spread to Sell Movable Offense,D924.3
  11. The Improving Research of Evaluation and Management in the Grassroots Organizations of Commercial Bank,F832.2
  12. Development Research on Farmer Cooperative Organizations in Qingzhou,F321.42
  13. A Study on the Impact of Knowledge Stickiness and Organizational Social Capital on Knowledge Transfer of the Multinational Retail Enterprise,F721
  14. Research on Dynamic Mechanism of the Tacit Knowledge Transfer between Organizations,F224
  15. Private Equity Fund in the Form of Legal Inquiry in China,F832.51
  16. Deduplication technology research and implementation,TP333
  17. Nanchang park Spontaneous Sports Organization Development Survey and Analysis,G812.4
  18. Preparation of semi-solid ramp hypereutectic Al-Si Alloys Research,TG249.9
  19. The Influence of Social Capital on Personal Knowledge Being Organized,F272.92
  20. Study on Technology of Emergency Traffic Organization for Regional Road Network under Sudden Events,U491
  21. Research on Physiology of Wax Apple during Postharvest Storage,S667.9

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Rolling > Rolling process > Sheet, strip,foil rolling > Sheet rolling
© 2012 www.DissertationTopic.Net  Mobile