Effects of Homogenization Conditions and Hot Rolling Parameters on Grain Refinement of an As-Cast 301 Stainless Steel

Document Type : Research Paper


Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran


 In this work, effects of homogenization time of 3 to 13 h at 1200 °C on the grain refinement of as-cast AISI 301 stainless steel after different hot rolling conditions were investigated. The results showed that the minimum grain size of 16±7 mm was achieved when homogenization took place at 1200 °C for 9 h followed by hot rolling at temperature range of 1000–1200 °C with strain of 0.8 and strain rate of 1.2 s-1 and annealing at 1050 °C for 3 min. Effect of Nb element on the retardation of recrystallization was pronounced. It seems that there is an optimum solute segregation below which retardation and above which grain growth of recrystallized grains is dominant. It was also found that this optimum homogenization condition was dependent upon the hot rolling parameters; higher the strain and strain rate resulted in lower homogenizing time at 1200 °C.


[1] H. J. McQueen, J. J. Jonas: Appl. Metalworking, 3(3) (1984), 233.
[2] I. Tamura, H. Sekine, T. Tanaka, C. Ouchi: Thermomechanical Processing of High-Strength Low-alloy Steel, 1st ed., Butterworth, (1988), 95.
[3] S. Yamamoto, C. Ouchi, T. Osuka: Thermomechanical processing of microalloyed austenite, American Institute of Metallurgical Engineers, (1981), 150.
[4] K. T. Aust, J. W. Rutter, Trans. MIME, 215 (1959), 119.
[5] Y. Qingbo, Y. Sun, Mate. Sci.Eng.A, (2006), 420.
[6] L. M. Storozheva, Metal Sci. Heat Treat., 31 (9-10) (1990), 692.
[7] M. Enomoto, H. I. Aaronson, Scripta Metall, 19 (1985), 1.
[8] M. Enomoto, Y. Sato, Mater. Trans A, 35 (1994), 862.
[9] A. I. Zaky Farahat, T. El-Bitar, Eman El-Shenawy: Mater. Sci. Eng. A, 492 (2008), 161.
[10] A. Belyakov, H. Miura, T. Sakai, Mater. Sci.Eng.A, 255 (1998), 139.
[11] W. Roberts, B. Ahlblom, Acta Metall., 26 (1978), 801.
[12] E. Brunger, X. Wang, G. Gottstein, Scripta Mater., 38 (1998), 1843.
[13] W. F. Hosfor, R. M. Caddell, Metal Forming-Mechanics and Metallurgy, Second ed., Prentic Hall, 1993.