感应加热温度对冷-热轧制成形钛/钢复合板界面的影响

Effect of induction heating temperature on the interface of cold-hot-rolled titanium/steel composite plates

对钛/钢组坯进行冷轧预复合成形,将钛/钢预复合板感应加热至热轧温度后单道次热轧成形制备了钛/钢复合板,研究了感应加热温度对钛/钢复合板的界面组织和界面结合性能的影响.结果表明,冷-热轧制复合法制备的钛/钢复合板的界面结合紧密,没有孔洞和间隙.钛/钢复合板由于感应加热和热轧的时间较短(<5 s),钛/钢界面仅有少量硬化层碎块,没有金属间化合物析出.钛/钢复合板的界面Ti和Fe元素扩散层宽度随感应加热温度增大而增大,950℃时界面扩散层宽度达到8μm.在感应加热温度为750~950℃的条件下,钛/钢复合板的界面结合良好.

Titanium/steel composite plates are widely used in petrochemical equipment,seawater desalination equipment,nuclear power equipment,ocean engineering,and other fields owing to the excellent corrosion resistance of titanium and low steel cost.Various methods have been adopted for manufacturing titanium/steel composite plates,which include explosive bonding,explosive-rolling bonding,diffusion bonding,and hot rolling bonding.Among these techniques,hot rolling bonding method enables the production of large-sized titanium/steel composite plates with high efficiency,low pollution,and low energy consumption.However,electron beam welding of billets is required to prevent interface oxidation and the formation of brittle compounds such as TiC,FeTi,and Fe2Ti on the interface,which may cause the degradation of mechanical properties of titanium/steel composite plates.In this study,the precomposite formation of billets was done through cold rolling and the titanium/steel composite plates were prepared via single pass hot rolling after induction heating to the hot rolling temperature.The effect of induction heating temperature on the interfacial structure and bonding properties of titanium/steel composite plates was studied.The results show that the interface of titanium/steel composite plates prepared by the cold-hot rolling composite method is tightly bonded without holes and gaps.The short induction heating and hot rolling time(<5 s)are insufficient for the formation of intermetallic compounds on the carbon steel side of the composite plates,yielding only a small number of blocky hardened layers at the titanium/steel interface.Higher induction heating temperature results in wider Ti and Fe element diffusion layer at the interface,with the maximum width of 8μm obtained at 950℃.The titanium/steel composite plates in this study achieved good metallurgical bonding with induction heating temperatures of 750℃ to 950℃.