Effects of over-aging process on selective oxidation behavior of a C-Mn-Si high strength steel
JIANG Guang-rui1,2，WANG Hai-quan1,3，LIU Li-bin1,2
（1. Research Institute of Technology， Shougang Group Co.， Ltd.， 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）
Abstract：To research application of dew point technology during over-aging process on high strength steel，effects of over-aging dew point （―30 and －10 ℃） and temperature （250 and 350 ℃） on the selective oxidation behavior of a C-Mn-Si high strength steel were studied through a hot dip process simulator. FE-SEM （field emission scanning electron microscope） and EDS （energy dispersive spectrometer） were applied to analyze morphology and chemistry of the surface，respectively. Alloying elements profiles in the subsurface were detected by GDOES （glow discharge optical emission spectroscopy）. Oxides on the external surface were identified by XPS （X-ray photoelectron spectroscopy）. It was found the a combination over-aging process of high temperature （350 ℃） and high dew point （―10 ℃） could notably suppress the selective oxidation of Si and Mn on the external surface，which resulted in amorphous silicon oxides （SiOx） and amorphous manganese oxides （MnOx） and even pure Mn on the external surface. With decreasing the temperature and the dew point of the over-aging process，enrichment of Si and Mn on the external surface increased remarkably. Meanwhile，it could be found that the influence of the dew point on the enrichment of alloying elements on the external surface was much stronger than that of the temperature. Moreover，with a combination of lower temperature （250 ℃） and lower dew point （―30 ℃），much more nodule-like oxides enriched with Mn and Si are formed on the externals surface，which were identified as crystalline manganese oxides （Mn3O4 and MnO2） and non-stoichiometric silicon oxides （SiO1.49 and SiO0.93）.
收稿日期: 2018-05-28
出版日期: 2019-02-22
引用本文:
蒋光锐，王海全，刘李斌，. 过时效工艺对C-Mn-Si高强钢表面选择性氧化的影响[J]. , 2019, 54(1): 71-78.
JIANG Guang-rui，，WANG Hai-quan，，LIU Li-bin，. Effects of over-aging process on selective oxidation behavior of a C-Mn-Si high strength steel. Iron and Steel, 2019, 54(1): 71-78.
2019, Vol. 54 
