To promote the columnar to equiaxed grain transition(CET)to obtain uniform equiaxed grain,most of the available theoretical works mainly focus on the growth but ignore the nucleation.Regarding it,a systematical framework integrating nucleation catalyzed by refiners with dendritic growth,was constructed,where,a new conception of generalized stability(GS),considering evolving thermodynamic driving force(ΔG)and kinetic energy barrier(Q)upon solidification of VTC,was adopted to study the CET position,the grain radius and the mechanical properties.By adding the refiners,especially the Al-5Ti-lB refiner,the larger thickness of 5-6 mm for equiaxed grain and finer grain radius of 19 μm are exhibited by increasing the ΔG for nucleation and the GS for growth,possessing simultaneously improved strength and plasticity.Following a criterion of high ΔG-high GS,the refiner diameter is optimized to be 0.3 μm.
关键词
广义稳定性/细化剂/柱状晶向等轴晶转变/双辊薄带连铸
Key words
generalized stability/refiner/columnar to equiaxed grain transition/twin roll casting
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基金项目
国家自然科学基金(51790481)
国家自然科学基金(51790483)
国家自然科学基金(52130110)
国家自然科学基金(51901182)
陕西省自然科学基金(2020JQ-157)
Research Fund of the State Key Laboratory of Solidification Processing,China(2022-TS-01)
Analytical & Testing Center of Northwestern Polytechnical University for equipment support()
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