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Area method analysis and thermodynamic behavior of nonmetallic micro-inclusions in casting slab of GCr15 bearing steel |
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| Authors: | Hongli Wang Yitai Ma Shuoming Wang |
| Institution: | 1. Research Institute of Thermal Energy,Tianjin University,Tianjin 300072,China;School of Metallurgy and Energy,Hebei Polytechnic University,Tangshan 063009,China 2. Research Institute of Thermal Energy,Tianjin University,Tianjin 300072,China 3. School of Metallurgy and Energy,Hebei Polytechnic University,Tangshan 063009,China |
| Abstract: | The distribution and characteristics of nonmetallic micro-inclusions of GCrI5 bearing steel were explored through metallographic area method in virtue of tracer method and electronic microscope.The results show that the micro-inclusions,of which the average value is 0.032%,are mainly the compounds formed via the adsorption/aggregation of multielement deoxidized compounds and secondarily deoxidized products on tundish liquid level.The micro-inclusions of diameters from 0 to 5 μm are 92.5% in total,which basically determines the characteristics of inclusions distribution in casting slab.The inclusions of diameters more than 10 μm only account for less than 1% in total,which have little influence on steel quality.The relationship between equilibrium compositions of the first deoxidation products and molten steel compositions was also calculated based on thermodynamic theory. |
| Keywords: | nonmetallic micro-inclusions GCr15 area method tracer method chemical equilibrium |
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