1 Products Description
Based on the actual application of the enterprise, GR12 is used as the clad plate, Q345R and Q245R are used as the base plate, and the explosive welding process is used for cladding. The welding method is parallel placement. Through continuous optimization of explosive welding process, titanium - steel composite plate with good comprehensive performance can be obtained. Through the analysis and study of the interface microstructure and mechanical properties of the titanium-steel composite plate, including the wavy bonding morphology of the interface, the plastic deformation during the explosion, the formation of the local melting zone, the diffusion and distribution of the alloy elements at the interface, etc., the mechanism of the explosion welding of the titanium-steel composite plate is discussed.
2 The specific research contents and experimental scheme of this subject are as follows
The explosive welding tests of GR12-Q345R and GR12-Q245R GR12 titanium clad steel plate were carried out respectively, including the surface cleaning of the base clad plate before welding. For the test base metal, first of all, through theoretical analysis, appropriate explosive welding process parameters are drawn up, including explosive type, charge quantity and base plate spacing. Then the explosive welding process test was carried out, and the parameters of explosive welding were optimized by combining the mechanical property test and interface micro-analysis of the composite plate.
(1) The mechanical properties of the two kinds of titanium-steel composite plates obtained by explosive welding were tested and analyzed, mainly including the tensile strength, shear strength, bending property and microhardness distribution of the composite plate.
(2) The microstructure of the bonding interface of the two kinds of titanium-steel explosive composite plates was observed and analyzed. Optical microscope, scanning electron microscope, X-ray diffractometer, energy spectrometer and transmission electron microscope were used to observe and analyze the microstructure, fracture morphology, phase structure composition, alloy element distribution and microstructure of the bonding interface, and explore the explosive welding mechanism of the titanium steel composite plate
(3) Heat treatment was carried out on the two titanium steel composite plates respectively, The effects of different heat treatment processes on the interface structure and mechanical properties of the composite plate were studied.
The corrosion resistance of the titanium-steel composite plate was analyzed and evaluated, including chemical immersion and electrochemical corrosion. The potentiodynamic polarization curves and AC impedance spectra of titanium side base metal, steel side base metal and composite plate samples in artificial seawater were tested respectively to analyze the difference of corrosion resistance between the two kinds of titanium steel composite plates, and compared with the corrosion resistance of cGR12 Titanium Clad Steel Plate.
3Test materials
The test base metal is GR12 titanium alloy plate (annealed) with a thickness of 3mm as the clad plate, and Q345R steel (hot rolled) with a thickness of 10mm and Q245R steel (hot rolled) with a thickness of 12mm as the base plate. GR12-Q345R and GR12-Q245R explosive clad plates are prepared by explosive welding. The chemical composition of the test base metal is shown in Table 21 and Table 2.2 respectively, and its mechanical and physical properties are shown in Table 2.3 and Table 2.4 respectively.
Table 2.1 Chemical composition of GR12 titanium alloy (w%)
Table 2.2 Chemical composition of Q245R and Q345R steel (wt%)
Table 2.3 Mechanical properties of test base metal
2.4 Physical properties of test base metal
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