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Microstructure and Interface Fracture Characteristics of Hot‐Rolled Stainless Steel Clad Plates by Adding Different Interlayers
Author(s) -
Wang Shuai,
Liu BaoXi,
Zhang Xin,
Chen CuiXin,
Fang Wei,
Ji PuGuang,
Feng JianHang,
Jiang YanFei,
Yin FuXing
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900604
Subject(s) - materials science , microstructure , ultimate tensile strength , composite material , scanning electron microscope , niobium , optical microscope , carbide , metallurgy , electron microprobe , diffusion , physics , thermodynamics
Series of 316L/Q235 stainless steel clad plates are successfully fabricated by hot rolling with different interlayers of ferrum (Fe), nickel (Ni), and niobium (Nb) foils. The interface microstructure, interfacial characteristics, shear performance, tensile properties, and fracture morphologies of clad plates are investigated using optical microscope (OM), ultra‐depth microscope, scanning electron microscope (SEM), electron probe microanalysis (EPMA), transmission electron microscope (TEM), and universal testing in detail. It is observed that the addition of Fe interlayer has rare effect on the interface element diffusion. Clad plate with Fe interlayer can only obtain poor tensile and shear properties, which is attributed to severe oxidation at the clad interface. On the contrary, the addition of Ni and Nb interlayers can both effectively inhibit the diffusion behavior of interface carbon element and remarkably reduce interfacial weak areas of carburized and decarburized layers. This is due to that Ni interlayer can sharply slow down the carbon diffusion velocity, and Nb interlayer can suppress interface carbon diffusion by reacting with carbon element and forming niobium carbide phase. After adding Ni or Nb interlayers, stainless steel clad plates can obtain superior interfacial bonding strength, tensile strength, and fracture elongation, eventually achieving the purpose toward strengthening and toughening the interface.