Effect of hot rolling parameters on recovery mechanism in 436 (17%Cr, Nb-Mo) ferritic stainless steel

  • M Salojee University of Pretoria
  • K A Annan University of Pretoria
  • C W Siyasiya University of Pretoria
  • J Moema Mintek
Keywords: Ferritic Stainless Steel (EBSD), Hot Rolling, Dynamic Recrystallisation (DRX), Microstructure

Abstract

Ferritic stainless steel (FSS) grades are widely used for applications that require high strength and corrosion resistance. Their cost and versatility in the steel market have attracted a lot of interest from both industry and academic research. Despite their desirable properties, these steels grades experience surface defects as a result of microstructural evolution that evolves due to softening mechanism. The current study simulated the roughing hot rolling processes of AISI 436 (17%Cr, Nb-Mo) FSS to study the effects of inter-pass time and strain on the precipitation behaviour and the softening mechanisms in 436 FSS. The softening mechanisms and the resulting microstructures were investigated using SEM-EBSD technique. The results revealed Particle Stimulated Nucleation of new grains during the simulated roughing rolling which promoted recrystallisation due to strain accumulation. Stored deformation energy was found to increase with an increase in interpass time and strain.

Author Biographies

M Salojee, University of Pretoria

Department of Materials Science and Metallurgical Engineering, University of Pretoria, Private bag X20, Hatfield 0002, Pretoria, South Africa

K A Annan, University of Pretoria

Department of Materials Science and Metallurgical Engineering, University of Pretoria, Private bag X20, Hatfield 0002, Pretoria, South Africa

C W Siyasiya, University of Pretoria

Department of Materials Science and Metallurgical Engineering, University of Pretoria, Private bag X20, Hatfield 0002, Pretoria, South Africa

J Moema, Mintek

Advanced Materials Division (AMD), Mintek, 200 Malibongwe Drive, Randburg, 2125, South Africa

Published
2022-01-24
How to Cite
Salojee, M., Annan, K., Siyasiya, C., & Moema, J. (2022). Effect of hot rolling parameters on recovery mechanism in 436 (17%Cr, Nb-Mo) ferritic stainless steel. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, 40(1), 1-7. Retrieved from http://satnt.ac.za/index.php/satnt/article/view/868
Section
Conference of the South African Advanced Materials Initiative

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