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| Heating process on oxidation behavior of P-bearing high strength steel |
| JIANG Guang-rui1,2，WANG Hai-quan1,2,3，LIU Li-bin1,2，4 |
（1. Thin Strip Department， Shougang Technology Research Institute， Beijing 100043， China
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology， Beijing 100043， China
3. National Engineering Lab of Advanced Coating Technology for Metal Materials， China Iron and Steel Research Institute Group， Beijing 100081， China
4. State Key Laboratory for Advanced Metals and Materials， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract With excellent formability and high strength，P-bearing high strength steel is utilized to stamping parts in automobile industry. Except P，several other alloying elements，such as Mn，Si，are added into the P-bearing high strength steel for solid solution strengthing. These alloying elements are prone to be selectively oxidized during annealing. A P-bearing steel was studied through a Hot-Dip Process Simulator to investigate effect of dew point during heating on oxidation behavior. Scanning electron microscope （SEM），glow-discharge optical omission spectroscopy （GD-OES） and X-ray photo-electron spectroscopy （XPS） were used to illustrate micromorphology of the surface， alloying elements depth distribution profile and kinds of compound on the external surface respectively. Results show that the dew point during heating greatly impact the oxidation behavior of alloying elements on the external surface. Moreover higher dew point during heating results in suppressing selective oxidation of Mn and Si on the external surface while promoting enriching of P to the external surface. Furthermore，it indicates that the P exists in phosphates on the external surface.
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Received: 21 March 2017
Published: 29 September 2017
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2017, Vol. 52 
