Abstract
The effect of high-frequency induction hardening on stress corrosion of a 12%Cr martensitic stainless steel in 22%NaCl solution was investigated by stress corrosion test. The stress corrosion properties of quenched-and-tempered zone and high-frequency hardening zone were analyzed by an electrochemical workstation and compared with each other. The microstructure, phases and stress corrosion fracture were studied by optical microscopy, transmission electron microscopy and scanning electron microscopy. The test results show that the pitting tendency of high-frequency hardening zone is smaller than that of the quenched-and-tempered zone. The cracks initiate at the bottom of surface pits and propagate by an intergranular mode in quenched-and-tempered zone. The microstructure of quenched-and-tempered zone are tempered sorbite. Many (Fe, Cr)7C3, (Fe, Cr)23C6 carbides of this zone are prone to segregating on dislocations in the lath cell walls of martensite laths and cell boundaries, which leads to local Cr depletion. The microstructure of high-frequency induction hardening zone was tempered martensite with little (Fe, Cr)3C and (Fe, Cr)7C3 carbides.
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Kang, T., Xi, Sq., Wei, Xp., Yang, Gx., Gong, Xf., Liu, Yj. (2017). Effect of High-Frequency Induction Hardening on Stress Corrosion of a 12%Cr Martensitic Stainless Steel. In: Liu, X., et al. Energy Materials 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-52333-0_17
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DOI: https://doi.org/10.1007/978-3-319-52333-0_17
Publisher Name: Springer, Cham
Online ISBN: 978-3-319-52333-0
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