Effect of rare earth on hot ductility of Fe-43Ni expansion alloy
QIAO De-gao1, FENG Liang2, FAN Xuan-yu2, YU Yan-chong2
1. Hongxing Iron and Steel Co., Ltd., Gansu Jiuquan Iron and Steel Group, Jiayuguan 735100, Gansu, China; 2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
Abstract：Fe-43Ni expansion alloy has poor hot ductility due to its coarse solidification structure, and often cracks seriously during hot rolling process. Focus on this problem, the effect of Ce content on hot ductility of Fe-43Ni expansion alloy was studied using Gleeble thermal mechanical simulator, SEM and EDS. The results show that the hot ductility of conventional Fe-43Ni expansion alloy is poor when the temperature is less than 1 000 ℃. With the addition of 0.025%Ce, a large number of Ce2O3 and Ce2O2S rare earth inclusions are formed in the alloy, the microstructure morphology of hot rolled plates are refined and the hot ductility of alloy is improved in the temperature range of 850-1 100 ℃, moreover, the high temperature ductility range has expanded 50 ℃ to the lower temperature zone. However, the alloy ingot cracks during hot rolling and the hot ductility of alloy seriously deteriorates with the addition of 0.063%Ce. Adding a suitable amount of Ce could improve the hot ductility of alloy, while excessive Ce would deteriorate the hot ductility. The experimental results provids some guidance for rare earth microalloying Fe-43Ni expansion alloy during the hot rolling process of large-scale productions.
Mintz B, Crowther D N. Hot ductility of steels and its relationship to the problem of transverse cracking in continuous casting[J]. International Materials Reviews,2010,55(3):168.
[6]
Vodopivec F, Torkar M, Debelak M, et al. Influence of aluminum on solidification structure and initial deformability of continuously cast C-Mn-Si-N steel[J]. Materials Science and Technology, 1988, 4(10): 917
[7]
Maehara Y, Yasumoto K, Tomono H, et al. Surface cracking mechanism of continuously cast low carbon low alloy steel slabs[J]. Materials Science and Technology, 1990, 6(9):793.
[8]
REN Q, ZHANG L F. Effect of cerium content on inclusions in an ultra-low-carbon aluminum-killed steel[J]. Metallurgical and Materials Transactions B, 2020, 51(2):589.
SONG S H, XU Y W, CHEN X M, et al.Effect of rare earth cerium and impurity tin on the hot ductility of a Cr-Mo low alloy steel[J]. Journal of Rare Earths, 2016, 34(10): 1062.
[15]
YANG C Y, LUAN Y K, LI D Z, et al. Effects of rare earth elements on inclusions and impact toughness of high-carbon chromium bearing steel[J]. Journal of Materials Science and Technology, 2019, 35(7): 1298.
Szuki H G, Nishimura S, Yamaguchi S. Characteristics of hot ductility in steel subjected to the melting and solidification[J]. Transaction ISIJ, 1982, 22(2): 48.
[19]
Wagner C. Passivity during the oxidation of silicon at elevated temperatures[J]. Journal of Applied Physics, 1985, 29(9): 1295.
[20]
WANG X F, CHEN E Q. Influence of cerium on hot workability of 00Cr25Ni7Mo4N super duplex stainless steel[J]. Journal of Rare Earth, 2010, 28(2): 295.
2023, Vol. 33 
