Study On Microstructure And Properties Of Titanium Clad Steel

The corrosion problem of steel for energy storage and transportation has been a major problem for a long time.Titanium clad steel plate has become an ideal material for energy storage and transportation steel because of its excellent corrosion resistance,excellent strength,toughness and good weldability.However,the development of laminated metal clad plate manufacturing technology in China is far less than that in Europe and the United States and other countries.The development of thin clad and wide sheet rolling technology has gradually become the main research direction of laminated metal clad plate production.In this paper,the microstructure and properties of titanium clad steel plates with different rolling processes were studied by finite element simulation and actual production,as well as subsequent heat treatment,so as to provide guidance for large-scale industrial production.In this paper,titanium clad steel plate was rolled by vacuum symmetrical billet.By changing the rolling temperature（800℃,850℃,900℃）and cooling mode（batch cooling after rolling,air cooling after rolling,water cooling after rolling）,as well as heat treatment test of rolled clad plate at different temperatures（800℃,900℃,1000℃）,titanium clad steel plate in different states was obtained.The interface microstructure of titanium clad steel plate was observed by conventional means,and the interface bonding ability was measured by universal testing machine.The results of different rolling processes show that the interfacial shear properties of titanium clad steel plate can meet the performance requirements when the rolling temperature is 800,850 and 900℃.With the increase of heating temperature,the interfacial shear strength decreases gradually.During the rolling process,C element will be enriched at the composite interface to form tic phase,and Ti and Fe elements will diffuse each other at the composite interface to form Ti-Fe intermetallic compounds（Fe₂Ti,Fe Ti）.The results show that with the increase of heat treatment temperature,the thickness of reaction layer increases and the bonding strength of composite interface decreases.The composite interface reaction layer can be divided into three layers:the layer near the titanium side of the interface reaction layer is a mixture of Fe Ti and Ti C,the middle part of the interface reaction layer is a tic layer,and the layer near the steel side of the interface reaction layer is a mixture of Fe₂Ti,Fe Ti and Ti C.The finite element simulation software DEFORM was used to simulate titanium clad steel plate under different rolling processes.The simulation results show that the rolling cumulative reduction rate is directly proportional to the equivalent strain of composite interface of titanium clad steel plate,and with the increase of rolling temperature,the equivalent strain of composite interface of titanium clad steel plate increases gradually.Higher rolling temperature and reduction rate can promote the composite interface and improvement of surface bonding strength.