Effect of dew point on surface oxidation behavior of DP590 dual phase steel

doi:10.13251/j.issn.0254-6051.2021.11.015

Abstract

Abstract: Oxidation of alloy elements is inevitable in continuous annealing process of the DP590 duplex steel. The DP590 steel after annealing at different dew points was characterized and analyzed by means of scanning electron microscope (SEM), X-ray energy spectrometer (EDS), glow discharge spectrometer (GDS), and X-ray photoelectron spectrometer (XPS). The results show that during annealing process, as the dew point temperature increases, the DP590 steel changes from external oxidation to internal oxidation, the oxidation degree of the steel plate surface shows a trend of first increasing and then decreasing. The numerical simulation results indicate that the critical transition dew point of internal and external oxidation of the DP590 steel is -8.26 ℃, which is consistent with the test results. The surface oxide of the DP590 steel is mainly manganese oxide. With the increase of dew point temperature, the enrichment peaks of Mn and O elements on the surface of DP590 steel increase first and then decrease, while that of Si and Al elements show a gradually decreasing trend. The XPS data show that the oxides formed on the surface of DP590 steel mainly exist in the form of MnO, Mn-Si-O oxide and Si-O oxide.

Key words: DP590 dual phase steel, continuous annealing, dew point, internal oxidation, enrichment

CLC Number:

TG162.83

Yang Peiyuan, Huo Qinghui, Chen Zhuo, Zhou Wei, Wang Hongbin. Effect of dew point on surface oxidation behavior of DP590 dual phase steel[J]. Heat Treatment of Metals, 2021, 46(11): 97-102.

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