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根据工业纯钛TA1和Q235钢两种材料相变温度接近的特点,提出了利用低压循环相变预复合-累积叠轧焊制备TA1/Q235钢复合板的新方法。研究结果表明:经过热循环后的试样,在变形过程中,C、Ti原子的扩散并不限于沿垂直于界面的方向,而是可以沿任意方向随机进行的,在Q235钢界面附近没有出现柱状晶,界面附近的铁素体晶粒,从界面附近沿心部成梯度分布;采用累积叠轧焊所制备出的TA1/Q235钢复合板的结合强度得到明显改善,在复合温度为850℃、低压循环相变3次所得到的TA1/Q235钢累积叠轧焊复合板结合强度达到257.3MPa。但是,当热循环相变次数过多时,会增加金属间化合物的厚度,对结合强度产生不利影响。
According to the characteristics that the phase transition temperatures of two kinds of materials of commercial pure titanium (TA1) and Q235 steel are close, a new method of preparing TA1 / Q235 steel composite plate by low pressure cyclic phase change pre-composite-overlap rolling is proposed. The results show that during thermal deformation, the diffusion of C and Ti atoms is not limited to the direction perpendicular to the interface, but can be randomized in any direction after the thermal cycling, and does not appear in the vicinity of Q235 steel interface The columnar grains and the ferrite grains in the vicinity of the interface are distributed gradiently from the center of the interface near the interface. The bond strength of TA1 / Q235 steel composite plate prepared by cumulative roll-bonding welding is obviously improved. When the composite temperature is 850 ℃ , The low pressure cycle phase change obtained three times TA1 / Q235 steel cumulative roll bonded composite plate bonding strength reaches 257.3MPa. However, when the number of thermal cycle transformations is too large, the thickness of the intermetallic compound is increased, adversely affecting the bonding strength.