Abstract
We elucidate here the determining role of Nb interlayer on mechanical properties of Ti/steel clad plate fabricated by vacuum rolling cladding (VRC) as a function of different heating temperatures. A critical analysis on the clad interface via electron probe micro-analyzer, X-ray diffractometer and shear testing were conducted to investigate the influence of TiC, Fe-Nb and TiFe compounds and Nb-Ti solid solution on microstructural evolution and shear properties of Ti/steel clad plate. The inter-diffusion between Ti, C and Fe was effectively restrained by adding the Nb interlayer at heating temperature of 800 °C, and average shear strength of 279 MPa was achieved. With increase of heating temperature, Nb-Ti solid solution was formed at the Ti/Nb interface, which reduced mechanical properties of clad plate at 900 °C. At 1000 °C, TiC and Nb-Fe compounds and Nb-Ti solid solution were formed at the interface, and minimum average shear strength of 152 MPa was achieved. The detailed analysis on the clad interface suggested that ideal shear strength can be obtained through the addition of Nb interlayer and selecting appropriate heating temperature.
Highlights
As a metal with high corrosion resistance, titanium is widely used in some fields including petrochemical, ship building, marine engineering, electric power industry etc
The corrosion resistance of Ti/steel clad plate was not deteriorated by the addition of Nb interlayer because of good corrosion resistance of Nb
Duringheating the industrial production of Ti/steel clad plate, it is very critical to minimize the amount of niobium interlayer on the basis of the Ti and steel isolation
Summary
As a metal with high corrosion resistance, titanium is widely used in some fields including petrochemical, ship building, marine engineering, electric power industry etc. The VRC technology was developed by introducing vacuum electron beam welding technology (EBW) on the basis of traditional hot-rolling cladding method Brittle interfacial products such as various oxides and nitrides can be effectively inhibited by VRC, which are expected to improve the mechanical properties of the clad plate. During hot-rolling cladding Ti/steel clad plate, the oxides and nitrides at the interface can be effectively controlled by VRC, but TiFe and TiC compounds are produced at the interface of Ti and steel at elevated temperature, which reduce the interfacial bonding property in Ti/steel clad plate. The effect of Nb interlayer on microstructural evolution and shear strength of Ti/steel clad plate by VRC is explored at various heating temperatures
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