Interface Structure And Interface Failure Behavior Of TA2/Stainless Steel/Q235 Composite Plate

Titanium/steel composite plates have wide application in petrochemical,shipbuilding,aerospace and other fields due to combine the high strength and low cost of steel,as well as the corrosion resistance of titanium.The interface structure is highly valued by people,which affects the mechanical properties of the laminated composite plates.The titanium/Stainless steel/Q235 composite plates is prepared by hot-rolling composite method using industrial pure titanium(TA2)and Q235B steel as matrix materials and stainless steel as the intermediate layer material in this paper.The preparation of the composite plates and the interface structure in the subsequent annealing process are studied.Experiment and numerical simulation influence of the interface structure on the mechanical properties of the composite plate was carried out.The research results have enriched people's understanding of the structural evolution process and interface failure behavior of titanium/steel composite plates,and can provide guidance for the actual preparation of titanium/steel composite plates and the improvement of mechanical properties.Based on EDS,XRD and other characterizations,it was found that the single-layer stainless steel intermediate layer can effectively inhibit the formation of Ti C intermetallic compounds during the rolling and compounding process.In the hot-rolled and annealed Titanium/Stainless steel/Q235 composite plates,the types of intermetallic phases produced were the same.The intermetallic layer were thicker when annealed from 650?to 950?.From the stainless steel side to the titanium side,the interface is composed of?phase(Cr rich solid solution),?phase(intermetallic compound),Ti Cr₂+Ti Fe₂,Ti Fe,and other compounds in sequence..The thickness of?phase and Ti Fe phase changes more obviously with temperature than?phase and Ti Cr₂+Ti Fe₂phase.As the thickness of the stainless steel layer increases,the carbon elements enriched at the interface structure interface become less and less,and there is almost no carbon element enrichment at the interface of the 3SS intermediate layer sample.The experimental and finite element simulation results show that during the in-plane compression of the annealed samples at 950?,the delamination failure of the intermetallic layer and the substrate is the main cause,and the cracks always originate at the intermetallic layer and the interface with the Ti substrate first.The deterioration effect of Ti C relative to the interface is more serious than that of Ti-Fe-Cr.The thicker the intermetallic layer is,the easier it is to crack at the sample interface.During the three-point complete deformation of the annealed sample at 950°C,the intermetallic layer itself will be broken,and no delamination or debonding will occur.The thicker the intermetallic layer is,the earlier the sample cracks will initiate and the greater the bending withstood during the failure process.The intermetallic sample layer containing Ti-Fe-Cr is harder to initiate cracks than the Ti C sample.Withstand greater bending moments.