Comparison of simulated seawater slurry erosion and wear behavior of low alloy steel with different microsturcture

doi:10.13251/j.issn.0254-6051.2024.01.009

Abstract

Abstract: Microstructure of the dual-phase steel and fully martensitic steel was characterized by using optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The corrosion resistance of this two steels was studied by means of potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The erosion corrosion behavior of the steels in simulated seawater mortar environment was analyzed by means of MSH erosion corrosion testing machine, and the surface morphology was characterized by using white light interferometer. The results show that the microstructure of the dual-phase steel is martensite matrix with ferrite volume fraction of 9.8%±0.6%.The microstructure of the fully martensitic steel is single lath martensite. Compared with fully martensitic steel, dual-phase steel has lower yield strength, tensile strength, hardness and corrosion resistance, but shows higher erosion-corrosion resistance. The reason is that the microhardness of martensitic phase in dual-phase steel is significantly higher than that of fully martensitic steel, and the coordination of soft and hard phases makes it difficult for microcracks to propagate in dual-phase steel, thus reducing the erosion-corrosion mass loss.

Key words: erosion, corrosion, erosion-corrosion, martensitic/ferrite dual-phase steel, fully martensitic steel

CLC Number:

TG142.1

Ren Wubin, Ma Heng, Cui Shaohua, Wang Menghu, Liang Xiaokai, Sun Xinjun. Comparison of simulated seawater slurry erosion and wear behavior of low alloy steel with different microsturcture[J]. Heat Treatment of Metals, 2024, 49(1): 61-68.

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