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Effect of controlled hot rolling parameters on microstructure of a nb-microalloyed steel sheet

Mirahmadi Khaki, D ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1063/1.3552530
  3. Publisher: 2010
  4. Abstract:
  5. The design of controlled rolling process of microalloyed steel sheets is affected by several factors. In this investigation, effect of the reheating, finishing and coiling temperatures of rolling, which are considered as the most effective parameters on microstructure of hot rolled products has been studied. For this purpose, seven different reheating temperatures between 1000 to 1300°C with 50°C increments, three different finishing temperatures of 950, 900 and 850°C below the non-recrystallization temperature and one temperature of 800°C in the inter critical range and four different coiling temperatures of 550, 600, 650 and 700°C were chosen. By soaking the specimens in furnace, the grain coarsening temperature (Tgc) is obtained about 1250°C. Hence, for these kinds of steels, the reheating temperature 1200 to 1250°C is recommended. Moreover, it is observed that decreasing the coiling and finishing temperatures causes more grain refinement of microstructure and the morphology is changed from polygonal ferrite to acicular one. Findings of this research provide a good connection among reheating, finishing and coiling temperatures and microstructural features of Nb-microalloyed steel sheets
  6. Keywords:
  7. Coiling temperature ; Controlled hot rolling ; Finishing temperature ; Microstructure ; Nb-microalloyed steel ; Reheating temperature
  8. Source: AIP Conference Proceedings, 24 October 2010 through 27 October 2010, Paris ; Volume 1315 , 2010 , Pages 69-74 ; 0094243X (ISSN) ; 9780735408715 (ISBN)
  9. URL: http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.3552530