High Temperature Oxidation Behavior of 700MPa Grade High Strength Steel Under Water Vapor Condition

doi:10.12068/j.issn.1005-3026.2021.07.002

Abstract

Abstract: High temperature oxidation behavior of high strength steel was systematically studied by high-temperature thermal gravimetric analyzer(TGA) and the law of oxidation weight gain under different relative humidity conditions was analyzed. Electron probe microanalysis(EPMA) was used to characterize the thickness， cross-sectional morphologies and element distribution of oxide scale and X-ray diffraction(XRD) was used to analyze the phase composition of oxide layer. The experimental results show that the form of weight gain curves transformed from linear law to parabolic law， the curves showed an obvious turning point， and the corresponding mass of oxide scale at the turning point increased with the increasing of relative humidity at 1000℃. Vapor promoted the formation of a large number of defects， such as pores and microcracks inside the oxide scale， which became diffusion channels for the ions， thereby accelerating the oxidation reaction. Moreover， the vapor promoted the diffusion of Si and Mn elements， which can leads to the expansion of the element-rich layer.

Key words: high strength steel; vapor; high temperature oxidation; oxidation kinetics; oxide scale

CLC Number:

TG111.5

WANG Hao， CAO Guang-ming， TANG Jun-jian， LIU Zhen-yu. High Temperature Oxidation Behavior of 700MPa Grade High Strength Steel Under Water Vapor Condition[J]. Journal of Northeastern University(Natural Science), 2021, 42(7): 920-926.

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