Microstructure, crystallography and nucleation mechanism of NANOBAIN steel
作者： Yao Huang , Ai-min Zhao , Jian-guo He , Xiao-pei Wang , Zhi-gang Wang
DOI: 10.1007/S12613-013-0849-6
关键词:
摘要: The microstructure of bainite ferrite in NANOBAIN steel transformed at different temperatures was investigated by scanning electron microscopy, transmission back-scattered diffraction, and vickers hardness tester detail. It is found that the average width bainitic (BF) plates can be refined to thinner with reduction temperature (473–573 K), reach up 20–74 nm 473 K. Crystallographic analysis reveals laths are close Nishiyama-Wasserman orientation relationship their parent austenite. Temperature shows a significant effect on variant selection, decrease generally weakens selection. Thermodynamic analyses indicates Lacher, Fowler Guggenheim (LFG) model more suitable than Kaufman, Radcliffe Cohen (KRC) dealing low range. free energy change ΔG γ→BF about −1500 J·mol−1 K, which nucleation shear mechanism. Finally, formation carbon poor regions thermodynamically possible, existence greatly increase possibility
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