Stress corrosion behavior of novel nano-reinforced M&A dual-phase steel

doi:10.13251/j.issn.0254-6051.2020.12.032

Abstract

Abstract: Stress corrosion behavior of a novel M&A dual-phase steel in 3.5%NaCl solution was studied by using slow strain rate tension and WOL specimen stress corrosion experiments. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and physicochemical phase analysis were used to observe the microstructure of the M&A dual-phase steel, and the anti-stress corrosion mechanism was explained. The results show that the M&A dual-phase steel has a low stress corrosion sensitivity, strong crack resistance and excellent stress corrosion resistance. In addition, Cl^- can promote stress corrosion behavior of M&A dual-phase steel, resulting in a certain loss of stress corrosion performance in 3.5%NaCl solution compared with tensile test results in air.The metastable reversed austenite makes M&A dual-phase steel have good ductility and toughness, which weakens stress concentration and hinders crack growth. The common plane of dislocation group is poor, and it is not easy to produce corrosion sensitive channel. The secondary phase of carbide and Cu nanometer is precipitated at 600 ℃ after tempering, which greatly improves the strength of materials and the stability of stress corrosion of steel.

Key words: slow strain rate tension, stress corrosion of WOL specimen, stress corrosion, reversed austenite, carbide, Cu precipitate

CLC Number:

TG172.9

Fu Hang, Liang Xiaokai, Sun Xinjun, Huang Tao. Stress corrosion behavior of novel nano-reinforced M&A dual-phase steel[J]. Heat Treatment of Metals, 2020, 45(12): 160-168.

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